diff --git a/gitk-git/gitk b/gitk-git/gitk
index abe4805ade..23d9dd1fe0 100755
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -11,14 +11,14 @@ package require Tk
 
 proc hasworktree {} {
     return [expr {[exec git rev-parse --is-bare-repository] == "false" &&
-		  [exec git rev-parse --is-inside-git-dir] == "false"}]
+                  [exec git rev-parse --is-inside-git-dir] == "false"}]
 }
 
 proc reponame {} {
     global gitdir
     set n [file normalize $gitdir]
     if {[string match "*/.git" $n]} {
-	set n [string range $n 0 end-5]
+        set n [string range $n 0 end-5]
     }
     return [file tail $n]
 }
@@ -26,7 +26,7 @@ proc reponame {} {
 proc gitworktree {} {
     variable _gitworktree
     if {[info exists _gitworktree]} {
-	return $_gitworktree
+        return $_gitworktree
     }
     # v1.7.0 introduced --show-toplevel to return the canonical work-tree
     if {[catch {set _gitworktree [exec git rev-parse --show-toplevel]}]} {
@@ -34,10 +34,9 @@ proc gitworktree {} {
         # cdup to obtain a relative path to the top of the worktree. If
         # run from the top, the ./ prefix ensures normalize expands pwd.
         if {[catch { set _gitworktree $env(GIT_WORK_TREE) }]} {
-	    catch {set _gitworktree [exec git config --get core.worktree]}
-	    if {$_gitworktree eq ""} {
-		set _gitworktree [file normalize ./[exec git rev-parse --show-cdup]]
-	    }
+            if {[catch {set _gitworktree [exec git config --get core.worktree]}]} {
+                set _gitworktree [file normalize ./[exec git rev-parse --show-cdup]]
+            }
         }
     }
     return $_gitworktree
@@ -54,7 +53,7 @@ proc run args {
     set script $args
     if {[info exists isonrunq($script)]} return
     if {$runq eq {} && ![info exists currunq]} {
-	after idle dorunq
+        after idle dorunq
     }
     lappend runq [list {} $script]
     set isonrunq($script) 1
@@ -69,7 +68,7 @@ proc filereadable {fd script} {
 
     fileevent $fd readable {}
     if {$runq eq {} && ![info exists currunq]} {
-	after idle dorunq
+        after idle dorunq
     }
     lappend runq [list $fd $script]
 }
@@ -78,11 +77,11 @@ proc nukefile {fd} {
     global runq
 
     for {set i 0} {$i < [llength $runq]} {} {
-	if {[lindex $runq $i 0] eq $fd} {
-	    set runq [lreplace $runq $i $i]
-	} else {
-	    incr i
-	}
+        if {[lindex $runq $i 0] eq $fd} {
+            set runq [lreplace $runq $i $i]
+        } else {
+            incr i
+        }
     }
 }
 
@@ -92,30 +91,30 @@ proc dorunq {} {
     set tstart [clock clicks -milliseconds]
     set t0 $tstart
     while {[llength $runq] > 0} {
-	set fd [lindex $runq 0 0]
-	set script [lindex $runq 0 1]
-	set currunq [lindex $runq 0]
-	set runq [lrange $runq 1 end]
-	set repeat [eval $script]
-	unset currunq
-	set t1 [clock clicks -milliseconds]
-	set t [expr {$t1 - $t0}]
-	if {$repeat ne {} && $repeat} {
-	    if {$fd eq {} || $repeat == 2} {
-		# script returns 1 if it wants to be readded
-		# file readers return 2 if they could do more straight away
-		lappend runq [list $fd $script]
-	    } else {
-		fileevent $fd readable [list filereadable $fd $script]
-	    }
-	} elseif {$fd eq {}} {
-	    unset isonrunq($script)
-	}
-	set t0 $t1
-	if {$t1 - $tstart >= 80} break
+        set fd [lindex $runq 0 0]
+        set script [lindex $runq 0 1]
+        set currunq [lindex $runq 0]
+        set runq [lrange $runq 1 end]
+        set repeat [eval $script]
+        unset currunq
+        set t1 [clock clicks -milliseconds]
+        set t [expr {$t1 - $t0}]
+        if {$repeat ne {} && $repeat} {
+            if {$fd eq {} || $repeat == 2} {
+                # script returns 1 if it wants to be readded
+                # file readers return 2 if they could do more straight away
+                lappend runq [list $fd $script]
+            } else {
+                fileevent $fd readable [list filereadable $fd $script]
+            }
+        } elseif {$fd eq {}} {
+            unset isonrunq($script)
+        }
+        set t0 $t1
+        if {$t1 - $tstart >= 80} break
     }
     if {$runq ne {}} {
-	after idle dorunq
+        after idle dorunq
     }
 }
 
@@ -135,20 +134,20 @@ proc unmerged_files {files} {
     set mlist {}
     set nr_unmerged 0
     if {[catch {
-	set fd [open "| git ls-files -u" r]
+        set fd [open "| git ls-files -u" r]
     } err]} {
-	show_error {} . "[mc "Couldn't get list of unmerged files:"] $err"
-	exit 1
+        show_error {} . "[mc "Couldn't get list of unmerged files:"] $err"
+        exit 1
     }
     while {[gets $fd line] >= 0} {
-	set i [string first "\t" $line]
-	if {$i < 0} continue
-	set fname [string range $line [expr {$i+1}] end]
-	if {[lsearch -exact $mlist $fname] >= 0} continue
-	incr nr_unmerged
-	if {$files eq {} || [path_filter $files $fname]} {
-	    lappend mlist $fname
-	}
+        set i [string first "\t" $line]
+        if {$i < 0} continue
+        set fname [string range $line [expr {$i+1}] end]
+        if {[lsearch -exact $mlist $fname] >= 0} continue
+        incr nr_unmerged
+        if {$files eq {} || [path_filter $files $fname]} {
+            lappend mlist $fname
+        }
     }
     catch {close $fd}
     return $mlist
@@ -171,115 +170,115 @@ proc parseviewargs {n arglist} {
     set filtered 0
     set i -1
     foreach arg $arglist {
-	incr i
-	if {$nextisval} {
-	    lappend glflags $arg
-	    set nextisval 0
-	    continue
-	}
-	switch -glob -- $arg {
-	    "-d" -
-	    "--date-order" {
-		set vdatemode($n) 1
-		# remove from origargs in case we hit an unknown option
-		set origargs [lreplace $origargs $i $i]
-		incr i -1
-	    }
-	    "-[puabwcrRBMC]" -
-	    "--no-renames" - "--full-index" - "--binary" - "--abbrev=*" -
-	    "--find-copies-harder" - "-l*" - "--ext-diff" - "--no-ext-diff" -
-	    "--src-prefix=*" - "--dst-prefix=*" - "--no-prefix" -
-	    "-O*" - "--text" - "--full-diff" - "--ignore-space-at-eol" -
-	    "--ignore-space-change" - "-U*" - "--unified=*" {
-		# These request or affect diff output, which we don't want.
-		# Some could be used to set our defaults for diff display.
-		lappend diffargs $arg
-	    }
-	    "--raw" - "--patch-with-raw" - "--patch-with-stat" -
-	    "--name-only" - "--name-status" - "--color" -
-	    "--log-size" - "--pretty=*" - "--decorate" - "--abbrev-commit" -
-	    "--cc" - "-z" - "--header" - "--parents" - "--boundary" -
-	    "--no-color" - "-g" - "--walk-reflogs" - "--no-walk" -
-	    "--timestamp" - "relative-date" - "--date=*" - "--stdin" -
-	    "--objects" - "--objects-edge" - "--reverse" {
-		# These cause our parsing of git log's output to fail, or else
-		# they're options we want to set ourselves, so ignore them.
-	    }
-	    "--color-words*" - "--word-diff=color" {
-		# These trigger a word diff in the console interface,
-		# so help the user by enabling our own support
-		if {[package vcompare $git_version "1.7.2"] >= 0} {
-		    set worddiff [mc "Color words"]
-		}
-	    }
-	    "--word-diff*" {
-		if {[package vcompare $git_version "1.7.2"] >= 0} {
-		    set worddiff [mc "Markup words"]
-		}
-	    }
-	    "--stat=*" - "--numstat" - "--shortstat" - "--summary" -
-	    "--check" - "--exit-code" - "--quiet" - "--topo-order" -
-	    "--full-history" - "--dense" - "--sparse" -
-	    "--follow" - "--left-right" - "--encoding=*" {
-		# These are harmless, and some are even useful
-		lappend glflags $arg
-	    }
-	    "--diff-filter=*" - "--no-merges" - "--unpacked" -
-	    "--max-count=*" - "--skip=*" - "--since=*" - "--after=*" -
-	    "--until=*" - "--before=*" - "--max-age=*" - "--min-age=*" -
-	    "--author=*" - "--committer=*" - "--grep=*" - "-[iE]" -
-	    "--remove-empty" - "--first-parent" - "--cherry-pick" -
-	    "-S*" - "-G*" - "--pickaxe-all" - "--pickaxe-regex" -
-	    "--simplify-by-decoration" {
-		# These mean that we get a subset of the commits
-		set filtered 1
-		lappend glflags $arg
-	    }
-	    "-L*" {
-		# Line-log with 'stuck' argument (unstuck form is
-		# not supported)
-		set filtered 1
-		set vinlinediff($n) 1
-		set allknown 0
-		lappend glflags $arg
-	    }
-	    "-n" {
-		# This appears to be the only one that has a value as a
-		# separate word following it
-		set filtered 1
-		set nextisval 1
-		lappend glflags $arg
-	    }
-	    "--not" - "--all" {
-		lappend revargs $arg
-	    }
-	    "--merge" {
-		set vmergeonly($n) 1
-		# git rev-parse doesn't understand --merge
-		lappend revargs --gitk-symmetric-diff-marker MERGE_HEAD...HEAD
-	    }
-	    "--no-replace-objects" {
-		set env(GIT_NO_REPLACE_OBJECTS) "1"
-	    }
-	    "-*" {
-		# Other flag arguments including -<n>
-		if {[string is digit -strict [string range $arg 1 end]]} {
-		    set filtered 1
-		} else {
-		    # a flag argument that we don't recognize;
-		    # that means we can't optimize
-		    set allknown 0
-		}
-		lappend glflags $arg
-	    }
-	    default {
-		# Non-flag arguments specify commits or ranges of commits
-		if {[string match "*...*" $arg]} {
-		    lappend revargs --gitk-symmetric-diff-marker
-		}
-		lappend revargs $arg
-	    }
-	}
+        incr i
+        if {$nextisval} {
+            lappend glflags $arg
+            set nextisval 0
+            continue
+        }
+        switch -glob -- $arg {
+            "-d" -
+            "--date-order" {
+                set vdatemode($n) 1
+                # remove from origargs in case we hit an unknown option
+                set origargs [lreplace $origargs $i $i]
+                incr i -1
+            }
+            "-[puabwcrRBMC]" -
+            "--no-renames" - "--full-index" - "--binary" - "--abbrev=*" -
+            "--find-copies-harder" - "-l*" - "--ext-diff" - "--no-ext-diff" -
+            "--src-prefix=*" - "--dst-prefix=*" - "--no-prefix" -
+            "-O*" - "--text" - "--full-diff" - "--ignore-space-at-eol" -
+            "--ignore-space-change" - "-U*" - "--unified=*" {
+                # These request or affect diff output, which we don't want.
+                # Some could be used to set our defaults for diff display.
+                lappend diffargs $arg
+            }
+            "--raw" - "--patch-with-raw" - "--patch-with-stat" -
+            "--name-only" - "--name-status" - "--color" -
+            "--log-size" - "--pretty=*" - "--decorate" - "--abbrev-commit" -
+            "--cc" - "-z" - "--header" - "--parents" - "--boundary" -
+            "--no-color" - "-g" - "--walk-reflogs" - "--no-walk" -
+            "--timestamp" - "relative-date" - "--date=*" - "--stdin" -
+            "--objects" - "--objects-edge" - "--reverse" {
+                # These cause our parsing of git log's output to fail, or else
+                # they're options we want to set ourselves, so ignore them.
+            }
+            "--color-words*" - "--word-diff=color" {
+                # These trigger a word diff in the console interface,
+                # so help the user by enabling our own support
+                if {[package vcompare $git_version "1.7.2"] >= 0} {
+                    set worddiff [mc "Color words"]
+                }
+            }
+            "--word-diff*" {
+                if {[package vcompare $git_version "1.7.2"] >= 0} {
+                    set worddiff [mc "Markup words"]
+                }
+            }
+            "--stat=*" - "--numstat" - "--shortstat" - "--summary" -
+            "--check" - "--exit-code" - "--quiet" - "--topo-order" -
+            "--full-history" - "--dense" - "--sparse" -
+            "--follow" - "--left-right" - "--encoding=*" {
+                # These are harmless, and some are even useful
+                lappend glflags $arg
+            }
+            "--diff-filter=*" - "--no-merges" - "--unpacked" -
+            "--max-count=*" - "--skip=*" - "--since=*" - "--after=*" -
+            "--until=*" - "--before=*" - "--max-age=*" - "--min-age=*" -
+            "--author=*" - "--committer=*" - "--grep=*" - "-[iE]" -
+            "--remove-empty" - "--first-parent" - "--cherry-pick" -
+            "-S*" - "-G*" - "--pickaxe-all" - "--pickaxe-regex" -
+            "--simplify-by-decoration" {
+                # These mean that we get a subset of the commits
+                set filtered 1
+                lappend glflags $arg
+            }
+            "-L*" {
+                # Line-log with 'stuck' argument (unstuck form is
+                # not supported)
+                set filtered 1
+                set vinlinediff($n) 1
+                set allknown 0
+                lappend glflags $arg
+            }
+            "-n" {
+                # This appears to be the only one that has a value as a
+                # separate word following it
+                set filtered 1
+                set nextisval 1
+                lappend glflags $arg
+            }
+            "--not" - "--all" {
+                lappend revargs $arg
+            }
+            "--merge" {
+                set vmergeonly($n) 1
+                # git rev-parse doesn't understand --merge
+                lappend revargs --gitk-symmetric-diff-marker MERGE_HEAD...HEAD
+            }
+            "--no-replace-objects" {
+                set env(GIT_NO_REPLACE_OBJECTS) "1"
+            }
+            "-*" {
+                # Other flag arguments including -<n>
+                if {[string is digit -strict [string range $arg 1 end]]} {
+                    set filtered 1
+                } else {
+                    # a flag argument that we don't recognize;
+                    # that means we can't optimize
+                    set allknown 0
+                }
+                lappend glflags $arg
+            }
+            default {
+                # Non-flag arguments specify commits or ranges of commits
+                if {[string match "*...*" $arg]} {
+                    lappend revargs --gitk-symmetric-diff-marker
+                }
+                lappend revargs $arg
+            }
+        }
     }
     set vdflags($n) $diffargs
     set vflags($n) $glflags
@@ -293,61 +292,61 @@ proc parseviewrevs {view revs} {
     global vposids vnegids
 
     if {$revs eq {}} {
-	set revs HEAD
+        set revs HEAD
     } elseif {[lsearch -exact $revs --all] >= 0} {
-	lappend revs HEAD
+        lappend revs HEAD
     }
     if {[catch {set ids [eval exec git rev-parse $revs]} err]} {
-	# we get stdout followed by stderr in $err
-	# for an unknown rev, git rev-parse echoes it and then errors out
-	set errlines [split $err "\n"]
-	set badrev {}
-	for {set l 0} {$l < [llength $errlines]} {incr l} {
-	    set line [lindex $errlines $l]
-	    if {!([string length $line] == 40 && [string is xdigit $line])} {
-		if {[string match "fatal:*" $line]} {
-		    if {[string match "fatal: ambiguous argument*" $line]
-			&& $badrev ne {}} {
-			if {[llength $badrev] == 1} {
-			    set err "unknown revision $badrev"
-			} else {
-			    set err "unknown revisions: [join $badrev ", "]"
-			}
-		    } else {
-			set err [join [lrange $errlines $l end] "\n"]
-		    }
-		    break
-		}
-		lappend badrev $line
-	    }
-	}
-	error_popup "[mc "Error parsing revisions:"] $err"
-	return {}
+        # we get stdout followed by stderr in $err
+        # for an unknown rev, git rev-parse echoes it and then errors out
+        set errlines [split $err "\n"]
+        set badrev {}
+        for {set l 0} {$l < [llength $errlines]} {incr l} {
+            set line [lindex $errlines $l]
+            if {!([string length $line] == 40 && [string is xdigit $line])} {
+                if {[string match "fatal:*" $line]} {
+                    if {[string match "fatal: ambiguous argument*" $line]
+                        && $badrev ne {}} {
+                        if {[llength $badrev] == 1} {
+                            set err "unknown revision $badrev"
+                        } else {
+                            set err "unknown revisions: [join $badrev ", "]"
+                        }
+                    } else {
+                        set err [join [lrange $errlines $l end] "\n"]
+                    }
+                    break
+                }
+                lappend badrev $line
+            }
+        }
+        error_popup "[mc "Error parsing revisions:"] $err"
+        return {}
     }
     set ret {}
     set pos {}
     set neg {}
     set sdm 0
     foreach id [split $ids "\n"] {
-	if {$id eq "--gitk-symmetric-diff-marker"} {
-	    set sdm 4
-	} elseif {[string match "^*" $id]} {
-	    if {$sdm != 1} {
-		lappend ret $id
-		if {$sdm == 3} {
-		    set sdm 0
-		}
-	    }
-	    lappend neg [string range $id 1 end]
-	} else {
-	    if {$sdm != 2} {
-		lappend ret $id
-	    } else {
-		lset ret end $id...[lindex $ret end]
-	    }
-	    lappend pos $id
-	}
-	incr sdm -1
+        if {$id eq "--gitk-symmetric-diff-marker"} {
+            set sdm 4
+        } elseif {[string match "^*" $id]} {
+            if {$sdm != 1} {
+                lappend ret $id
+                if {$sdm == 3} {
+                    set sdm 0
+                }
+            }
+            lappend neg [string range $id 1 end]
+        } else {
+            if {$sdm != 2} {
+                lappend ret $id
+            } else {
+                lset ret end $id...[lindex $ret end]
+            }
+            lappend pos $id
+        }
+        incr sdm -1
     }
     set vposids($view) $pos
     set vnegids($view) $neg
@@ -374,63 +373,63 @@ proc start_rev_list {view} {
 
     set args $viewargs($view)
     if {$viewargscmd($view) ne {}} {
-	if {[catch {
-	    set str [exec sh -c $viewargscmd($view)]
-	} err]} {
-	    error_popup "[mc "Error executing --argscmd command:"] $err"
-	    return 0
-	}
-	set args [concat $args [split $str "\n"]]
+        if {[catch {
+            set str [exec sh -c $viewargscmd($view)]
+        } err]} {
+            error_popup "[mc "Error executing --argscmd command:"] $err"
+            return 0
+        }
+        set args [concat $args [split $str "\n"]]
     }
     set vcanopt($view) [parseviewargs $view $args]
 
     set files $viewfiles($view)
     if {$vmergeonly($view)} {
-	set files [unmerged_files $files]
-	if {$files eq {}} {
-	    global nr_unmerged
-	    if {$nr_unmerged == 0} {
-		error_popup [mc "No files selected: --merge specified but\
-			     no files are unmerged."]
-	    } else {
-		error_popup [mc "No files selected: --merge specified but\
-			     no unmerged files are within file limit."]
-	    }
-	    return 0
-	}
+        set files [unmerged_files $files]
+        if {$files eq {}} {
+            global nr_unmerged
+            if {$nr_unmerged == 0} {
+                error_popup [mc "No files selected: --merge specified but\
+                             no files are unmerged."]
+            } else {
+                error_popup [mc "No files selected: --merge specified but\
+                             no unmerged files are within file limit."]
+            }
+            return 0
+        }
     }
     set vfilelimit($view) $files
 
     if {$vcanopt($view)} {
-	set revs [parseviewrevs $view $vrevs($view)]
-	if {$revs eq {}} {
-	    return 0
-	}
-	set args [concat $vflags($view) $revs]
+        set revs [parseviewrevs $view $vrevs($view)]
+        if {$revs eq {}} {
+            return 0
+        }
+        set args [concat $vflags($view) $revs]
     } else {
-	set args $vorigargs($view)
+        set args $vorigargs($view)
     }
 
     if {[catch {
-	set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
-			--parents --boundary $args "--" $files] r]
+        set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
+                        --parents --boundary $args "--" $files] r]
     } err]} {
-	error_popup "[mc "Error executing git log:"] $err"
-	return 0
+        error_popup "[mc "Error executing git log:"] $err"
+        return 0
     }
     set i [reg_instance $fd]
     set viewinstances($view) [list $i]
     set viewmainheadid($view) $mainheadid
     set viewmainheadid_orig($view) $mainheadid
     if {$files ne {} && $mainheadid ne {}} {
-	get_viewmainhead $view
+        get_viewmainhead $view
     }
     if {$showlocalchanges && $viewmainheadid($view) ne {}} {
-	interestedin $viewmainheadid($view) dodiffindex
+        interestedin $viewmainheadid($view) dodiffindex
     }
     fconfigure $fd -blocking 0 -translation lf -eofchar {}
     if {$tclencoding != {}} {
-	fconfigure $fd -encoding $tclencoding
+        fconfigure $fd -encoding $tclencoding
     }
     filerun $fd [list getcommitlines $fd $i $view 0]
     nowbusy $view [mc "Reading"]
@@ -444,13 +443,13 @@ proc stop_instance {inst} {
 
     set fd $commfd($inst)
     catch {
-	set pid [pid $fd]
+        set pid [pid $fd]
 
-	if {$::tcl_platform(platform) eq {windows}} {
-	    exec taskkill /pid $pid
-	} else {
-	    exec kill $pid
-	}
+        if {$::tcl_platform(platform) eq {windows}} {
+            exec taskkill /pid $pid
+        } else {
+            exec kill $pid
+        }
     }
     catch {close $fd}
     nukefile $fd
@@ -462,7 +461,7 @@ proc stop_backends {} {
     global commfd
 
     foreach inst [array names commfd] {
-	stop_instance $inst
+        stop_instance $inst
     }
 }
 
@@ -470,7 +469,7 @@ proc stop_rev_list {view} {
     global viewinstances
 
     foreach inst $viewinstances($view) {
-	stop_instance $inst
+        stop_instance $inst
     }
     set viewinstances($view) {}
 }
@@ -479,11 +478,11 @@ proc reset_pending_select {selid} {
     global pending_select mainheadid selectheadid
 
     if {$selid ne {}} {
-	set pending_select $selid
+        set pending_select $selid
     } elseif {$selectheadid ne {}} {
-	set pending_select $selectheadid
+        set pending_select $selectheadid
     } else {
-	set pending_select $mainheadid
+        set pending_select $mainheadid
     }
 }
 
@@ -492,11 +491,11 @@ proc getcommits {selid} {
 
     initlayout
     if {[start_rev_list $curview]} {
-	reset_pending_select $selid
-	show_status [mc "Reading commits..."]
-	set need_redisplay 1
+        reset_pending_select $selid
+        show_status [mc "Reading commits..."]
+        set need_redisplay 1
     } else {
-	show_status [mc "No commits selected"]
+        show_status [mc "No commits selected"]
     }
 }
 
@@ -513,67 +512,67 @@ proc updatecommits {} {
     rereadrefs
     set view $curview
     if {$mainheadid ne $viewmainheadid_orig($view)} {
-	if {$showlocalchanges} {
-	    dohidelocalchanges
-	}
-	set viewmainheadid($view) $mainheadid
-	set viewmainheadid_orig($view) $mainheadid
-	if {$vfilelimit($view) ne {}} {
-	    get_viewmainhead $view
-	}
+        if {$showlocalchanges} {
+            dohidelocalchanges
+        }
+        set viewmainheadid($view) $mainheadid
+        set viewmainheadid_orig($view) $mainheadid
+        if {$vfilelimit($view) ne {}} {
+            get_viewmainhead $view
+        }
     }
     if {$showlocalchanges} {
-	doshowlocalchanges
+        doshowlocalchanges
     }
     if {$vcanopt($view)} {
-	set oldpos $vposids($view)
-	set oldneg $vnegids($view)
-	set revs [parseviewrevs $view $vrevs($view)]
-	if {$revs eq {}} {
-	    return
-	}
-	# note: getting the delta when negative refs change is hard,
-	# and could require multiple git log invocations, so in that
-	# case we ask git log for all the commits (not just the delta)
-	if {$oldneg eq $vnegids($view)} {
-	    set newrevs {}
-	    set npos 0
-	    # take out positive refs that we asked for before or
-	    # that we have already seen
-	    foreach rev $revs {
-		if {[string length $rev] == 40} {
-		    if {[lsearch -exact $oldpos $rev] < 0
-			&& ![info exists varcid($view,$rev)]} {
-			lappend newrevs $rev
-			incr npos
-		    }
-		} else {
-		    lappend $newrevs $rev
-		}
-	    }
-	    if {$npos == 0} return
-	    set revs $newrevs
-	    set vposids($view) [lsort -unique [concat $oldpos $vposids($view)]]
-	}
-	set args [concat $vflags($view) $revs --not $oldpos]
+        set oldpos $vposids($view)
+        set oldneg $vnegids($view)
+        set revs [parseviewrevs $view $vrevs($view)]
+        if {$revs eq {}} {
+            return
+        }
+        # note: getting the delta when negative refs change is hard,
+        # and could require multiple git log invocations, so in that
+        # case we ask git log for all the commits (not just the delta)
+        if {$oldneg eq $vnegids($view)} {
+            set newrevs {}
+            set npos 0
+            # take out positive refs that we asked for before or
+            # that we have already seen
+            foreach rev $revs {
+                if {[string length $rev] == 40} {
+                    if {[lsearch -exact $oldpos $rev] < 0
+                        && ![info exists varcid($view,$rev)]} {
+                        lappend newrevs $rev
+                        incr npos
+                    }
+                } else {
+                    lappend $newrevs $rev
+                }
+            }
+            if {$npos == 0} return
+            set revs $newrevs
+            set vposids($view) [lsort -unique [concat $oldpos $vposids($view)]]
+        }
+        set args [concat $vflags($view) $revs --not $oldpos]
     } else {
-	set args $vorigargs($view)
+        set args $vorigargs($view)
     }
     if {[catch {
-	set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
-			--parents --boundary $args "--" $vfilelimit($view)] r]
+        set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
+                        --parents --boundary $args "--" $vfilelimit($view)] r]
     } err]} {
-	error_popup "[mc "Error executing git log:"] $err"
-	return
+        error_popup "[mc "Error executing git log:"] $err"
+        return
     }
     if {$viewactive($view) == 0} {
-	set startmsecs [clock clicks -milliseconds]
+        set startmsecs [clock clicks -milliseconds]
     }
     set i [reg_instance $fd]
     lappend viewinstances($view) $i
     fconfigure $fd -blocking 0 -translation lf -eofchar {}
     if {$tclencoding != {}} {
-	fconfigure $fd -encoding $tclencoding
+        fconfigure $fd -encoding $tclencoding
     }
     filerun $fd [list getcommitlines $fd $i $view 1]
     incr viewactive($view)
@@ -581,7 +580,7 @@ proc updatecommits {} {
     reset_pending_select {}
     nowbusy $view [mc "Reading"]
     if {$showneartags} {
-	getallcommits
+        getallcommits
     }
 }
 
@@ -592,11 +591,11 @@ proc reloadcommits {} {
 
     set selid {}
     if {$selectedline ne {}} {
-	set selid $currentid
+        set selid $currentid
     }
 
     if {!$viewcomplete($curview)} {
-	stop_rev_list $curview
+        stop_rev_list $curview
     }
     resetvarcs $curview
     set selectedline {}
@@ -606,7 +605,7 @@ proc reloadcommits {} {
     readrefs
     changedrefs
     if {$showneartags} {
-	getallcommits
+        getallcommits
     }
     clear_display
     unset -nocomplain commitinfo
@@ -622,11 +621,11 @@ proc reloadcommits {} {
 # sorts as a string in numerical order
 proc strrep {n} {
     if {$n < 16} {
-	return [format "%x" $n]
+        return [format "%x" $n]
     } elseif {$n < 256} {
-	return [format "x%.2x" $n]
+        return [format "x%.2x" $n]
     } elseif {$n < 65536} {
-	return [format "y%.4x" $n]
+        return [format "y%.4x" $n]
     }
     return [format "z%.8x" $n]
 }
@@ -657,22 +656,22 @@ proc resetvarcs {view} {
     global vshortids
 
     foreach vid [array names varcid $view,*] {
-	unset varcid($vid)
-	unset children($vid)
-	unset parents($vid)
+        unset varcid($vid)
+        unset children($vid)
+        unset parents($vid)
     }
     foreach vid [array names vshortids $view,*] {
-	unset vshortids($vid)
+        unset vshortids($vid)
     }
     # some commits might have children but haven't been seen yet
     foreach vid [array names children $view,*] {
-	unset children($vid)
+        unset children($vid)
     }
     foreach va [array names varccommits $view,*] {
-	unset varccommits($va)
+        unset varccommits($va)
     }
     foreach vd [array names vseedcount $view,*] {
-	unset vseedcount($vd)
+        unset vseedcount($vd)
     }
     unset -nocomplain ordertok
 }
@@ -684,8 +683,8 @@ proc seeds {v} {
     set ret {}
     set a [lindex $vdownptr($v) 0]
     while {$a != 0} {
-	lappend ret [lindex $varcstart($v) $a]
-	set a [lindex $vleftptr($v) $a]
+        lappend ret [lindex $varcstart($v) $a]
+        set a [lindex $vleftptr($v) $a]
     }
     return $ret
 }
@@ -698,60 +697,60 @@ proc newvarc {view id} {
     set a [llength $varctok($view)]
     set vid $view,$id
     if {[llength $children($vid)] == 0 || $vdatemode($view)} {
-	if {![info exists commitinfo($id)]} {
-	    parsecommit $id $commitdata($id) 1
-	}
-	set cdate [lindex [lindex $commitinfo($id) 4] 0]
-	if {![string is integer -strict $cdate]} {
-	    set cdate 0
-	}
-	if {![info exists vseedcount($view,$cdate)]} {
-	    set vseedcount($view,$cdate) -1
-	}
-	set c [incr vseedcount($view,$cdate)]
-	set cdate [expr {$cdate ^ 0xffffffff}]
-	set tok "s[strrep $cdate][strrep $c]"
+        if {![info exists commitinfo($id)]} {
+            parsecommit $id $commitdata($id) 1
+        }
+        set cdate [lindex [lindex $commitinfo($id) 4] 0]
+        if {![string is integer -strict $cdate]} {
+            set cdate 0
+        }
+        if {![info exists vseedcount($view,$cdate)]} {
+            set vseedcount($view,$cdate) -1
+        }
+        set c [incr vseedcount($view,$cdate)]
+        set cdate [expr {$cdate ^ 0xffffffff}]
+        set tok "s[strrep $cdate][strrep $c]"
     } else {
-	set tok {}
+        set tok {}
     }
     set ka 0
     if {[llength $children($vid)] > 0} {
-	set kid [lindex $children($vid) end]
-	set k $varcid($view,$kid)
-	if {[string compare [lindex $varctok($view) $k] $tok] > 0} {
-	    set ki $kid
-	    set ka $k
-	    set tok [lindex $varctok($view) $k]
-	}
+        set kid [lindex $children($vid) end]
+        set k $varcid($view,$kid)
+        if {[string compare [lindex $varctok($view) $k] $tok] > 0} {
+            set ki $kid
+            set ka $k
+            set tok [lindex $varctok($view) $k]
+        }
     }
     if {$ka != 0} {
-	set i [lsearch -exact $parents($view,$ki) $id]
-	set j [expr {[llength $parents($view,$ki)] - 1 - $i}]
-	append tok [strrep $j]
+        set i [lsearch -exact $parents($view,$ki) $id]
+        set j [expr {[llength $parents($view,$ki)] - 1 - $i}]
+        append tok [strrep $j]
     }
     set c [lindex $vlastins($view) $ka]
     if {$c == 0 || [string compare $tok [lindex $varctok($view) $c]] < 0} {
-	set c $ka
-	set b [lindex $vdownptr($view) $ka]
+        set c $ka
+        set b [lindex $vdownptr($view) $ka]
     } else {
-	set b [lindex $vleftptr($view) $c]
+        set b [lindex $vleftptr($view) $c]
     }
     while {$b != 0 && [string compare $tok [lindex $varctok($view) $b]] >= 0} {
-	set c $b
-	set b [lindex $vleftptr($view) $c]
+        set c $b
+        set b [lindex $vleftptr($view) $c]
     }
     if {$c == $ka} {
-	lset vdownptr($view) $ka $a
-	lappend vbackptr($view) 0
+        lset vdownptr($view) $ka $a
+        lappend vbackptr($view) 0
     } else {
-	lset vleftptr($view) $c $a
-	lappend vbackptr($view) $c
+        lset vleftptr($view) $c $a
+        lappend vbackptr($view) $c
     }
     lset vlastins($view) $ka $a
     lappend vupptr($view) $ka
     lappend vleftptr($view) $b
     if {$b != 0} {
-	lset vbackptr($view) $b $a
+        lset vbackptr($view) $b $a
     }
     lappend varctok($view) $tok
     lappend varcstart($view) $id
@@ -782,7 +781,7 @@ proc splitvarc {p v} {
     set varccommits($v,$na) [lrange $ac $i end]
     lappend varcstart($v) $p
     foreach id $varccommits($v,$na) {
-	set varcid($v,$id) $na
+        set varcid($v,$id) $na
     }
     lappend vdownptr($v) [lindex $vdownptr($v) $oa]
     lappend vlastins($v) [lindex $vlastins($v) $oa]
@@ -792,10 +791,10 @@ proc splitvarc {p v} {
     lappend vleftptr($v) 0
     lappend vbackptr($v) 0
     for {set b [lindex $vdownptr($v) $na]} {$b != 0} {set b [lindex $vleftptr($v) $b]} {
-	lset vupptr($v) $b $na
+        lset vupptr($v) $b $na
     }
     if {[string compare $otok $vtokmod($v)] <= 0} {
-	modify_arc $v $oa
+        modify_arc $v $oa
     }
 }
 
@@ -809,120 +808,120 @@ proc renumbervarc {a v} {
     set kidchanged($a) 1
     set ntot 0
     while {$a != 0} {
-	if {[info exists isrelated($a)]} {
-	    lappend todo $a
-	    set id [lindex $varccommits($v,$a) end]
-	    foreach p $parents($v,$id) {
-		if {[info exists varcid($v,$p)]} {
-		    set isrelated($varcid($v,$p)) 1
-		}
-	    }
-	}
-	incr ntot
-	set b [lindex $vdownptr($v) $a]
-	if {$b == 0} {
-	    while {$a != 0} {
-		set b [lindex $vleftptr($v) $a]
-		if {$b != 0} break
-		set a [lindex $vupptr($v) $a]
-	    }
-	}
-	set a $b
+        if {[info exists isrelated($a)]} {
+            lappend todo $a
+            set id [lindex $varccommits($v,$a) end]
+            foreach p $parents($v,$id) {
+                if {[info exists varcid($v,$p)]} {
+                    set isrelated($varcid($v,$p)) 1
+                }
+            }
+        }
+        incr ntot
+        set b [lindex $vdownptr($v) $a]
+        if {$b == 0} {
+            while {$a != 0} {
+                set b [lindex $vleftptr($v) $a]
+                if {$b != 0} break
+                set a [lindex $vupptr($v) $a]
+            }
+        }
+        set a $b
     }
     foreach a $todo {
-	if {![info exists kidchanged($a)]} continue
-	set id [lindex $varcstart($v) $a]
-	if {[llength $children($v,$id)] > 1} {
-	    set children($v,$id) [lsort -command [list vtokcmp $v] \
-				      $children($v,$id)]
-	}
-	set oldtok [lindex $varctok($v) $a]
-	if {!$vdatemode($v)} {
-	    set tok {}
-	} else {
-	    set tok $oldtok
-	}
-	set ka 0
-	set kid [last_real_child $v,$id]
-	if {$kid ne {}} {
-	    set k $varcid($v,$kid)
-	    if {[string compare [lindex $varctok($v) $k] $tok] > 0} {
-		set ki $kid
-		set ka $k
-		set tok [lindex $varctok($v) $k]
-	    }
-	}
-	if {$ka != 0} {
-	    set i [lsearch -exact $parents($v,$ki) $id]
-	    set j [expr {[llength $parents($v,$ki)] - 1 - $i}]
-	    append tok [strrep $j]
-	}
-	if {$tok eq $oldtok} {
-	    continue
-	}
-	set id [lindex $varccommits($v,$a) end]
-	foreach p $parents($v,$id) {
-	    if {[info exists varcid($v,$p)]} {
-		set kidchanged($varcid($v,$p)) 1
-	    } else {
-		set sortkids($p) 1
-	    }
-	}
-	lset varctok($v) $a $tok
-	set b [lindex $vupptr($v) $a]
-	if {$b != $ka} {
-	    if {[string compare [lindex $varctok($v) $ka] $vtokmod($v)] < 0} {
-		modify_arc $v $ka
-	    }
-	    if {[string compare [lindex $varctok($v) $b] $vtokmod($v)] < 0} {
-		modify_arc $v $b
-	    }
-	    set c [lindex $vbackptr($v) $a]
-	    set d [lindex $vleftptr($v) $a]
-	    if {$c == 0} {
-		lset vdownptr($v) $b $d
-	    } else {
-		lset vleftptr($v) $c $d
-	    }
-	    if {$d != 0} {
-		lset vbackptr($v) $d $c
-	    }
-	    if {[lindex $vlastins($v) $b] == $a} {
-		lset vlastins($v) $b $c
-	    }
-	    lset vupptr($v) $a $ka
-	    set c [lindex $vlastins($v) $ka]
-	    if {$c == 0 || \
-		    [string compare $tok [lindex $varctok($v) $c]] < 0} {
-		set c $ka
-		set b [lindex $vdownptr($v) $ka]
-	    } else {
-		set b [lindex $vleftptr($v) $c]
-	    }
-	    while {$b != 0 && \
-		      [string compare $tok [lindex $varctok($v) $b]] >= 0} {
-		set c $b
-		set b [lindex $vleftptr($v) $c]
-	    }
-	    if {$c == $ka} {
- 		lset vdownptr($v) $ka $a
-		lset vbackptr($v) $a 0
-	    } else {
-		lset vleftptr($v) $c $a
-		lset vbackptr($v) $a $c
-	    }
-	    lset vleftptr($v) $a $b
-	    if {$b != 0} {
-		lset vbackptr($v) $b $a
-	    }
-	    lset vlastins($v) $ka $a
-	}
+        if {![info exists kidchanged($a)]} continue
+        set id [lindex $varcstart($v) $a]
+        if {[llength $children($v,$id)] > 1} {
+            set children($v,$id) [lsort -command [list vtokcmp $v] \
+                                      $children($v,$id)]
+        }
+        set oldtok [lindex $varctok($v) $a]
+        if {!$vdatemode($v)} {
+            set tok {}
+        } else {
+            set tok $oldtok
+        }
+        set ka 0
+        set kid [last_real_child $v,$id]
+        if {$kid ne {}} {
+            set k $varcid($v,$kid)
+            if {[string compare [lindex $varctok($v) $k] $tok] > 0} {
+                set ki $kid
+                set ka $k
+                set tok [lindex $varctok($v) $k]
+            }
+        }
+        if {$ka != 0} {
+            set i [lsearch -exact $parents($v,$ki) $id]
+            set j [expr {[llength $parents($v,$ki)] - 1 - $i}]
+            append tok [strrep $j]
+        }
+        if {$tok eq $oldtok} {
+            continue
+        }
+        set id [lindex $varccommits($v,$a) end]
+        foreach p $parents($v,$id) {
+            if {[info exists varcid($v,$p)]} {
+                set kidchanged($varcid($v,$p)) 1
+            } else {
+                set sortkids($p) 1
+            }
+        }
+        lset varctok($v) $a $tok
+        set b [lindex $vupptr($v) $a]
+        if {$b != $ka} {
+            if {[string compare [lindex $varctok($v) $ka] $vtokmod($v)] < 0} {
+                modify_arc $v $ka
+            }
+            if {[string compare [lindex $varctok($v) $b] $vtokmod($v)] < 0} {
+                modify_arc $v $b
+            }
+            set c [lindex $vbackptr($v) $a]
+            set d [lindex $vleftptr($v) $a]
+            if {$c == 0} {
+                lset vdownptr($v) $b $d
+            } else {
+                lset vleftptr($v) $c $d
+            }
+            if {$d != 0} {
+                lset vbackptr($v) $d $c
+            }
+            if {[lindex $vlastins($v) $b] == $a} {
+                lset vlastins($v) $b $c
+            }
+            lset vupptr($v) $a $ka
+            set c [lindex $vlastins($v) $ka]
+            if {$c == 0 || \
+                    [string compare $tok [lindex $varctok($v) $c]] < 0} {
+                set c $ka
+                set b [lindex $vdownptr($v) $ka]
+            } else {
+                set b [lindex $vleftptr($v) $c]
+            }
+            while {$b != 0 && \
+                      [string compare $tok [lindex $varctok($v) $b]] >= 0} {
+                set c $b
+                set b [lindex $vleftptr($v) $c]
+            }
+            if {$c == $ka} {
+                lset vdownptr($v) $ka $a
+                lset vbackptr($v) $a 0
+            } else {
+                lset vleftptr($v) $c $a
+                lset vbackptr($v) $a $c
+            }
+            lset vleftptr($v) $a $b
+            if {$b != 0} {
+                lset vbackptr($v) $b $a
+            }
+            lset vlastins($v) $ka $a
+        }
     }
     foreach id [array names sortkids] {
-	if {[llength $children($v,$id)] > 1} {
-	    set children($v,$id) [lsort -command [list vtokcmp $v] \
-				      $children($v,$id)]
-	}
+        if {[llength $children($v,$id)] > 1} {
+            set children($v,$id) [lsort -command [list vtokcmp $v] \
+                                      $children($v,$id)]
+        }
     }
     set t2 [clock clicks -milliseconds]
     #puts "renumbervarc did [llength $todo] of $ntot arcs in [expr {$t2-$t1}]ms"
@@ -936,14 +935,14 @@ proc fix_reversal {p a v} {
 
     set pa $varcid($v,$p)
     if {$p ne [lindex $varcstart($v) $pa]} {
-	splitvarc $p $v
-	set pa $varcid($v,$p)
+        splitvarc $p $v
+        set pa $varcid($v,$p)
     }
     # seeds always need to be renumbered
     if {[lindex $vupptr($v) $pa] == 0 ||
-	[string compare [lindex $varctok($v) $a] \
-	     [lindex $varctok($v) $pa]] > 0} {
-	renumbervarc $pa $v
+        [string compare [lindex $varctok($v) $a] \
+             [lindex $varctok($v) $pa]] > 0} {
+        renumbervarc $pa $v
     }
 }
 
@@ -961,24 +960,24 @@ proc insertrow {id p v} {
     set varcid($vid) $a
     lappend vshortids($v,[string range $id 0 3]) $id
     if {[string compare [lindex $varctok($v) $a] $vtokmod($v)] < 0} {
-	modify_arc $v $a
+        modify_arc $v $a
     }
     lappend varccommits($v,$a) $id
     set vp $v,$p
     if {[llength [lappend children($vp) $id]] > 1} {
-	set children($vp) [lsort -command [list vtokcmp $v] $children($vp)]
-	unset -nocomplain ordertok
+        set children($vp) [lsort -command [list vtokcmp $v] $children($vp)]
+        unset -nocomplain ordertok
     }
     fix_reversal $p $a $v
     incr commitidx($v)
     if {$v == $curview} {
-	set numcommits $commitidx($v)
-	setcanvscroll
-	if {[info exists targetid]} {
-	    if {![comes_before $targetid $p]} {
-		incr targetrow
-	    }
-	}
+        set numcommits $commitidx($v)
+        setcanvscroll
+        if {[info exists targetid]} {
+            if {![comes_before $targetid $p]} {
+                incr targetrow
+            }
+        }
     }
 }
 
@@ -990,8 +989,8 @@ proc insertfakerow {id p} {
     set a $varcid($v,$p)
     set i [lsearch -exact $varccommits($v,$a) $p]
     if {$i < 0} {
-	puts "oops: insertfakerow can't find [shortids $p] on arc $a"
-	return
+        puts "oops: insertfakerow can't find [shortids $p] on arc $a"
+        return
     }
     set children($v,$id) {}
     set parents($v,$id) [list $p]
@@ -1003,9 +1002,9 @@ proc insertfakerow {id p} {
     set varccommits($v,$a) [linsert $varccommits($v,$a) $i $id]
     modify_arc $v $a $i
     if {[info exists targetid]} {
-	if {![comes_before $targetid $p]} {
-	    incr targetrow
-	}
+        if {![comes_before $targetid $p]} {
+            incr targetrow
+        }
     }
     setcanvscroll
     drawvisible
@@ -1018,15 +1017,15 @@ proc removefakerow {id} {
 
     set v $curview
     if {[llength $parents($v,$id)] != 1} {
-	puts "oops: removefakerow [shortids $id] has [llength $parents($v,$id)] parents"
-	return
+        puts "oops: removefakerow [shortids $id] has [llength $parents($v,$id)] parents"
+        return
     }
     set p [lindex $parents($v,$id) 0]
     set a $varcid($v,$id)
     set i [lsearch -exact $varccommits($v,$a) $id]
     if {$i < 0} {
-	puts "oops: removefakerow can't find [shortids $id] on arc $a"
-	return
+        puts "oops: removefakerow can't find [shortids $id] on arc $a"
+        return
     }
     unset varcid($v,$id)
     set varccommits($v,$a) [lreplace $varccommits($v,$a) $i $i]
@@ -1036,15 +1035,15 @@ proc removefakerow {id} {
     set numcommits [incr commitidx($v) -1]
     set j [lsearch -exact $children($v,$p) $id]
     if {$j >= 0} {
-	set children($v,$p) [lreplace $children($v,$p) $j $j]
+        set children($v,$p) [lreplace $children($v,$p) $j $j]
     }
     modify_arc $v $a $i
     if {[info exist currentid] && $id eq $currentid} {
-	unset currentid
-	set selectedline {}
+        unset currentid
+        set selectedline {}
     }
     if {[info exists targetid] && $targetid eq $id} {
-	set targetid $p
+        set targetid $p
     }
     setcanvscroll
     drawvisible
@@ -1055,9 +1054,9 @@ proc real_children {vp} {
 
     set kids {}
     foreach id $children($vp) {
-	if {$id ne $nullid && $id ne $nullid2} {
-	    lappend kids $id
-	}
+        if {$id ne $nullid && $id ne $nullid2} {
+            lappend kids $id
+        }
     }
     return $kids
 }
@@ -1066,9 +1065,9 @@ proc first_real_child {vp} {
     global children nullid nullid2
 
     foreach id $children($vp) {
-	if {$id ne $nullid && $id ne $nullid2} {
-	    return $id
-	}
+        if {$id ne $nullid && $id ne $nullid2} {
+            return $id
+        }
     }
     return {}
 }
@@ -1078,10 +1077,10 @@ proc last_real_child {vp} {
 
     set kids $children($vp)
     for {set i [llength $kids]} {[incr i -1] >= 0} {} {
-	set id [lindex $kids $i]
-	if {$id ne $nullid && $id ne $nullid2} {
-	    return $id
-	}
+        set id [lindex $kids $i]
+        if {$id ne $nullid && $id ne $nullid2} {
+            return $id
+        }
     }
     return {}
 }
@@ -1090,7 +1089,7 @@ proc vtokcmp {v a b} {
     global varctok varcid
 
     return [string compare [lindex $varctok($v) $varcid($v,$a)] \
-		[lindex $varctok($v) $varcid($v,$b)]]
+                [lindex $varctok($v) $varcid($v,$b)]]
 }
 
 # This assumes that if lim is not given, the caller has checked that
@@ -1099,29 +1098,29 @@ proc modify_arc {v a {lim {}}} {
     global varctok vtokmod varcmod varcrow vupptr curview vrowmod varccommits
 
     if {$lim ne {}} {
-	set c [string compare [lindex $varctok($v) $a] $vtokmod($v)]
-	if {$c > 0} return
-	if {$c == 0} {
-	    set r [lindex $varcrow($v) $a]
-	    if {$r ne {} && $vrowmod($v) <= $r + $lim} return
-	}
+        set c [string compare [lindex $varctok($v) $a] $vtokmod($v)]
+        if {$c > 0} return
+        if {$c == 0} {
+            set r [lindex $varcrow($v) $a]
+            if {$r ne {} && $vrowmod($v) <= $r + $lim} return
+        }
     }
     set vtokmod($v) [lindex $varctok($v) $a]
     set varcmod($v) $a
     if {$v == $curview} {
-	while {$a != 0 && [lindex $varcrow($v) $a] eq {}} {
-	    set a [lindex $vupptr($v) $a]
-	    set lim {}
-	}
-	set r 0
-	if {$a != 0} {
-	    if {$lim eq {}} {
-		set lim [llength $varccommits($v,$a)]
-	    }
-	    set r [expr {[lindex $varcrow($v) $a] + $lim}]
-	}
-	set vrowmod($v) $r
-	undolayout $r
+        while {$a != 0 && [lindex $varcrow($v) $a] eq {}} {
+            set a [lindex $vupptr($v) $a]
+            set lim {}
+        }
+        set r 0
+        if {$a != 0} {
+            if {$lim eq {}} {
+                set lim [llength $varccommits($v,$a)]
+            }
+            set r [expr {[lindex $varcrow($v) $a] + $lim}]
+        }
+        set vrowmod($v) $r
+        undolayout $r
     }
 }
 
@@ -1133,62 +1132,62 @@ proc update_arcrows {v} {
 
     if {$vrowmod($v) == $commitidx($v)} return
     if {$v == $curview} {
-	if {[llength $displayorder] > $vrowmod($v)} {
-	    set displayorder [lrange $displayorder 0 [expr {$vrowmod($v) - 1}]]
-	    set parentlist [lrange $parentlist 0 [expr {$vrowmod($v) - 1}]]
-	}
-	unset -nocomplain cached_commitrow
+        if {[llength $displayorder] > $vrowmod($v)} {
+            set displayorder [lrange $displayorder 0 [expr {$vrowmod($v) - 1}]]
+            set parentlist [lrange $parentlist 0 [expr {$vrowmod($v) - 1}]]
+        }
+        unset -nocomplain cached_commitrow
     }
     set narctot [expr {[llength $varctok($v)] - 1}]
     set a $varcmod($v)
     while {$a != 0 && [lindex $varcix($v) $a] eq {}} {
-	# go up the tree until we find something that has a row number,
-	# or we get to a seed
-	set a [lindex $vupptr($v) $a]
+        # go up the tree until we find something that has a row number,
+        # or we get to a seed
+        set a [lindex $vupptr($v) $a]
     }
     if {$a == 0} {
-	set a [lindex $vdownptr($v) 0]
-	if {$a == 0} return
-	set vrownum($v) {0}
-	set varcorder($v) [list $a]
-	lset varcix($v) $a 0
-	lset varcrow($v) $a 0
-	set arcn 0
-	set row 0
+        set a [lindex $vdownptr($v) 0]
+        if {$a == 0} return
+        set vrownum($v) {0}
+        set varcorder($v) [list $a]
+        lset varcix($v) $a 0
+        lset varcrow($v) $a 0
+        set arcn 0
+        set row 0
     } else {
-	set arcn [lindex $varcix($v) $a]
-	if {[llength $vrownum($v)] > $arcn + 1} {
-	    set vrownum($v) [lrange $vrownum($v) 0 $arcn]
-	    set varcorder($v) [lrange $varcorder($v) 0 $arcn]
-	}
-	set row [lindex $varcrow($v) $a]
+        set arcn [lindex $varcix($v) $a]
+        if {[llength $vrownum($v)] > $arcn + 1} {
+            set vrownum($v) [lrange $vrownum($v) 0 $arcn]
+            set varcorder($v) [lrange $varcorder($v) 0 $arcn]
+        }
+        set row [lindex $varcrow($v) $a]
     }
     while {1} {
-	set p $a
-	incr row [llength $varccommits($v,$a)]
-	# go down if possible
-	set b [lindex $vdownptr($v) $a]
-	if {$b == 0} {
-	    # if not, go left, or go up until we can go left
-	    while {$a != 0} {
-		set b [lindex $vleftptr($v) $a]
-		if {$b != 0} break
-		set a [lindex $vupptr($v) $a]
-	    }
-	    if {$a == 0} break
-	}
-	set a $b
-	incr arcn
-	lappend vrownum($v) $row
-	lappend varcorder($v) $a
-	lset varcix($v) $a $arcn
-	lset varcrow($v) $a $row
+        set p $a
+        incr row [llength $varccommits($v,$a)]
+        # go down if possible
+        set b [lindex $vdownptr($v) $a]
+        if {$b == 0} {
+            # if not, go left, or go up until we can go left
+            while {$a != 0} {
+                set b [lindex $vleftptr($v) $a]
+                if {$b != 0} break
+                set a [lindex $vupptr($v) $a]
+            }
+            if {$a == 0} break
+        }
+        set a $b
+        incr arcn
+        lappend vrownum($v) $row
+        lappend varcorder($v) $a
+        lset varcix($v) $a $arcn
+        lset varcrow($v) $a $row
     }
     set vtokmod($v) [lindex $varctok($v) $p]
     set varcmod($v) $p
     set vrowmod($v) $row
     if {[info exists currentid]} {
-	set selectedline [rowofcommit $currentid]
+        set selectedline [rowofcommit $currentid]
     }
 }
 
@@ -1206,20 +1205,20 @@ proc rowofcommit {id} {
 
     set v $curview
     if {![info exists varcid($v,$id)]} {
-	puts "oops rowofcommit no arc for [shortids $id]"
-	return {}
+        puts "oops rowofcommit no arc for [shortids $id]"
+        return {}
     }
     set a $varcid($v,$id)
     if {[string compare [lindex $varctok($v) $a] $vtokmod($v)] >= 0} {
-	update_arcrows $v
+        update_arcrows $v
     }
     if {[info exists cached_commitrow($id)]} {
-	return $cached_commitrow($id)
+        return $cached_commitrow($id)
     }
     set i [lsearch -exact $varccommits($v,$a) $id]
     if {$i < 0} {
-	puts "oops didn't find commit [shortids $id] in arc $a"
-	return {}
+        puts "oops didn't find commit [shortids $id] in arc $a"
+        return {}
     }
     incr i [lindex $varcrow($v) $a]
     set cached_commitrow($id) $i
@@ -1232,32 +1231,32 @@ proc comes_before {a b} {
 
     set v $curview
     if {$a eq $b || ![info exists varcid($v,$a)] || \
-	    ![info exists varcid($v,$b)]} {
-	return 0
+            ![info exists varcid($v,$b)]} {
+        return 0
     }
     if {$varcid($v,$a) != $varcid($v,$b)} {
-	return [expr {[string compare [lindex $varctok($v) $varcid($v,$a)] \
-			   [lindex $varctok($v) $varcid($v,$b)]] < 0}]
+        return [expr {[string compare [lindex $varctok($v) $varcid($v,$a)] \
+                           [lindex $varctok($v) $varcid($v,$b)]] < 0}]
     }
     return [expr {[rowofcommit $a] < [rowofcommit $b]}]
 }
 
 proc bsearch {l elt} {
     if {[llength $l] == 0 || $elt <= [lindex $l 0]} {
-	return 0
+        return 0
     }
     set lo 0
     set hi [llength $l]
     while {$hi - $lo > 1} {
-	set mid [expr {int(($lo + $hi) / 2)}]
-	set t [lindex $l $mid]
-	if {$elt < $t} {
-	    set hi $mid
-	} elseif {$elt > $t} {
-	    set lo $mid
-	} else {
-	    return $mid
-	}
+        set mid [expr {int(($lo + $hi) / 2)}]
+        set t [lindex $l $mid]
+        if {$elt < $t} {
+            set hi $mid
+        } elseif {$elt > $t} {
+            set lo $mid
+        } else {
+            return $mid
+        }
     }
     return $lo
 }
@@ -1269,37 +1268,37 @@ proc make_disporder {start end} {
     global d_valid_start d_valid_end
 
     if {$end > $vrowmod($curview)} {
-	update_arcrows $curview
+        update_arcrows $curview
     }
     set ai [bsearch $vrownum($curview) $start]
     set start [lindex $vrownum($curview) $ai]
     set narc [llength $vrownum($curview)]
     for {set r $start} {$ai < $narc && $r < $end} {incr ai} {
-	set a [lindex $varcorder($curview) $ai]
-	set l [llength $displayorder]
-	set al [llength $varccommits($curview,$a)]
-	if {$l < $r + $al} {
-	    if {$l < $r} {
-		set pad [ntimes [expr {$r - $l}] {}]
-		set displayorder [concat $displayorder $pad]
-		set parentlist [concat $parentlist $pad]
-	    } elseif {$l > $r} {
-		set displayorder [lrange $displayorder 0 [expr {$r - 1}]]
-		set parentlist [lrange $parentlist 0 [expr {$r - 1}]]
-	    }
-	    foreach id $varccommits($curview,$a) {
-		lappend displayorder $id
-		lappend parentlist $parents($curview,$id)
-	    }
-	} elseif {[lindex $displayorder [expr {$r + $al - 1}]] eq {}} {
-	    set i $r
-	    foreach id $varccommits($curview,$a) {
-		lset displayorder $i $id
-		lset parentlist $i $parents($curview,$id)
-		incr i
-	    }
-	}
-	incr r $al
+        set a [lindex $varcorder($curview) $ai]
+        set l [llength $displayorder]
+        set al [llength $varccommits($curview,$a)]
+        if {$l < $r + $al} {
+            if {$l < $r} {
+                set pad [ntimes [expr {$r - $l}] {}]
+                set displayorder [concat $displayorder $pad]
+                set parentlist [concat $parentlist $pad]
+            } elseif {$l > $r} {
+                set displayorder [lrange $displayorder 0 [expr {$r - 1}]]
+                set parentlist [lrange $parentlist 0 [expr {$r - 1}]]
+            }
+            foreach id $varccommits($curview,$a) {
+                lappend displayorder $id
+                lappend parentlist $parents($curview,$id)
+            }
+        } elseif {[lindex $displayorder [expr {$r + $al - 1}]] eq {}} {
+            set i $r
+            foreach id $varccommits($curview,$a) {
+                lset displayorder $i $id
+                lset parentlist $i $parents($curview,$id)
+                incr i
+            }
+        }
+        incr r $al
     }
 }
 
@@ -1308,8 +1307,8 @@ proc commitonrow {row} {
 
     set id [lindex $displayorder $row]
     if {$id eq {}} {
-	make_disporder $row [expr {$row + 1}]
-	set id [lindex $displayorder $row]
+        make_disporder $row [expr {$row + 1}]
+        set id [lindex $displayorder $row]
     }
     return $id
 }
@@ -1322,35 +1321,35 @@ proc closevarcs {v} {
     set scripts {}
     set narcs [llength $varctok($v)]
     for {set a 1} {$a < $narcs} {incr a} {
-	set id [lindex $varccommits($v,$a) end]
-	foreach p $parents($v,$id) {
-	    if {[info exists varcid($v,$p)]} continue
-	    # add p as a new commit
-	    incr missing_parents
-	    set cmitlisted($v,$p) 0
-	    set parents($v,$p) {}
-	    if {[llength $children($v,$p)] == 1 &&
-		[llength $parents($v,$id)] == 1} {
-		set b $a
-	    } else {
-		set b [newvarc $v $p]
-	    }
-	    set varcid($v,$p) $b
-	    if {[string compare [lindex $varctok($v) $b] $vtokmod($v)] < 0} {
-		modify_arc $v $b
-	    }
-	    lappend varccommits($v,$b) $p
-	    incr commitidx($v)
-	    if {$v == $curview} {
-		set numcommits $commitidx($v)
-	    }
-	    set scripts [check_interest $p $scripts]
-	}
+        set id [lindex $varccommits($v,$a) end]
+        foreach p $parents($v,$id) {
+            if {[info exists varcid($v,$p)]} continue
+            # add p as a new commit
+            incr missing_parents
+            set cmitlisted($v,$p) 0
+            set parents($v,$p) {}
+            if {[llength $children($v,$p)] == 1 &&
+                [llength $parents($v,$id)] == 1} {
+                set b $a
+            } else {
+                set b [newvarc $v $p]
+            }
+            set varcid($v,$p) $b
+            if {[string compare [lindex $varctok($v) $b] $vtokmod($v)] < 0} {
+                modify_arc $v $b
+            }
+            lappend varccommits($v,$b) $p
+            incr commitidx($v)
+            if {$v == $curview} {
+                set numcommits $commitidx($v)
+            }
+            set scripts [check_interest $p $scripts]
+        }
     }
     if {$missing_parents > 0} {
-	foreach s $scripts {
-	    eval $s
-	}
+        foreach s $scripts {
+            eval $s
+        }
     }
 }
 
@@ -1360,23 +1359,23 @@ proc rewrite_commit {v id rwid} {
     global children parents varcid varctok vtokmod varccommits
 
     foreach ch $children($v,$id) {
-	# make $rwid be $ch's parent in place of $id
-	set i [lsearch -exact $parents($v,$ch) $id]
-	if {$i < 0} {
-	    puts "oops rewrite_commit didn't find $id in parent list for $ch"
-	}
-	set parents($v,$ch) [lreplace $parents($v,$ch) $i $i $rwid]
-	# add $ch to $rwid's children and sort the list if necessary
-	if {[llength [lappend children($v,$rwid) $ch]] > 1} {
-	    set children($v,$rwid) [lsort -command [list vtokcmp $v] \
-					$children($v,$rwid)]
-	}
-	# fix the graph after joining $id to $rwid
-	set a $varcid($v,$ch)
-	fix_reversal $rwid $a $v
-	# parentlist is wrong for the last element of arc $a
-	# even if displayorder is right, hence the 3rd arg here
-	modify_arc $v $a [expr {[llength $varccommits($v,$a)] - 1}]
+        # make $rwid be $ch's parent in place of $id
+        set i [lsearch -exact $parents($v,$ch) $id]
+        if {$i < 0} {
+            puts "oops rewrite_commit didn't find $id in parent list for $ch"
+        }
+        set parents($v,$ch) [lreplace $parents($v,$ch) $i $i $rwid]
+        # add $ch to $rwid's children and sort the list if necessary
+        if {[llength [lappend children($v,$rwid) $ch]] > 1} {
+            set children($v,$rwid) [lsort -command [list vtokcmp $v] \
+                                        $children($v,$rwid)]
+        }
+        # fix the graph after joining $id to $rwid
+        set a $varcid($v,$ch)
+        fix_reversal $rwid $a $v
+        # parentlist is wrong for the last element of arc $a
+        # even if displayorder is right, hence the 3rd arg here
+        modify_arc $v $a [expr {[llength $varccommits($v,$a)] - 1}]
     }
 }
 
@@ -1396,19 +1395,19 @@ proc check_interest {id scripts} {
 
     set prefix [string range $id 0 3]
     if {[info exists commitinterest($prefix)]} {
-	set newlist {}
-	foreach {i script} $commitinterest($prefix) {
-	    if {[string match "$i*" $id]} {
-		lappend scripts [string map [list "%I" $id "%P" $i] $script]
-	    } else {
-		lappend newlist $i $script
-	    }
-	}
-	if {$newlist ne {}} {
-	    set commitinterest($prefix) $newlist
-	} else {
-	    unset commitinterest($prefix)
-	}
+        set newlist {}
+        foreach {i script} $commitinterest($prefix) {
+            if {[string match "$i*" $id]} {
+                lappend scripts [string map [list "%I" $id "%P" $i] $script]
+            } else {
+                lappend newlist $i $script
+            }
+        }
+        if {$newlist ne {}} {
+            set commitinterest($prefix) $newlist
+        } else {
+            unset commitinterest($prefix)
+        }
     }
     return $scripts
 }
@@ -1423,192 +1422,192 @@ proc getcommitlines {fd inst view updating}  {
     set stuff [read $fd 500000]
     # git log doesn't terminate the last commit with a null...
     if {$stuff == {} && $leftover($inst) ne {} && [eof $fd]} {
-	set stuff "\0"
+        set stuff "\0"
     }
     if {$stuff == {}} {
-	if {![eof $fd]} {
-	    return 1
-	}
-	global commfd viewcomplete viewactive viewname
-	global viewinstances
-	unset commfd($inst)
-	set i [lsearch -exact $viewinstances($view) $inst]
-	if {$i >= 0} {
-	    set viewinstances($view) [lreplace $viewinstances($view) $i $i]
-	}
-	# set it blocking so we wait for the process to terminate
-	fconfigure $fd -blocking 1
-	if {[catch {close $fd} err]} {
-	    set fv {}
-	    if {$view != $curview} {
-		set fv " for the \"$viewname($view)\" view"
-	    }
-	    if {[string range $err 0 4] == "usage"} {
-		set err "Gitk: error reading commits$fv:\
-			bad arguments to git log."
-		if {$viewname($view) eq [mc "Command line"]} {
-		    append err \
-			"  (Note: arguments to gitk are passed to git log\
-			 to allow selection of commits to be displayed.)"
-		}
-	    } else {
-		set err "Error reading commits$fv: $err"
-	    }
-	    error_popup $err
-	}
-	if {[incr viewactive($view) -1] <= 0} {
-	    set viewcomplete($view) 1
-	    # Check if we have seen any ids listed as parents that haven't
-	    # appeared in the list
-	    closevarcs $view
-	    notbusy $view
-	}
-	if {$view == $curview} {
-	    run chewcommits
-	}
-	return 0
+        if {![eof $fd]} {
+            return 1
+        }
+        global commfd viewcomplete viewactive viewname
+        global viewinstances
+        unset commfd($inst)
+        set i [lsearch -exact $viewinstances($view) $inst]
+        if {$i >= 0} {
+            set viewinstances($view) [lreplace $viewinstances($view) $i $i]
+        }
+        # set it blocking so we wait for the process to terminate
+        fconfigure $fd -blocking 1
+        if {[catch {close $fd} err]} {
+            set fv {}
+            if {$view != $curview} {
+                set fv " for the \"$viewname($view)\" view"
+            }
+            if {[string range $err 0 4] == "usage"} {
+                set err "Gitk: error reading commits$fv:\
+                        bad arguments to git log."
+                if {$viewname($view) eq [mc "Command line"]} {
+                    append err \
+                        "  (Note: arguments to gitk are passed to git log\
+                         to allow selection of commits to be displayed.)"
+                }
+            } else {
+                set err "Error reading commits$fv: $err"
+            }
+            error_popup $err
+        }
+        if {[incr viewactive($view) -1] <= 0} {
+            set viewcomplete($view) 1
+            # Check if we have seen any ids listed as parents that haven't
+            # appeared in the list
+            closevarcs $view
+            notbusy $view
+        }
+        if {$view == $curview} {
+            run chewcommits
+        }
+        return 0
     }
     set start 0
     set gotsome 0
     set scripts {}
     while 1 {
-	set i [string first "\0" $stuff $start]
-	if {$i < 0} {
-	    append leftover($inst) [string range $stuff $start end]
-	    break
-	}
-	if {$start == 0} {
-	    set cmit $leftover($inst)
-	    append cmit [string range $stuff 0 [expr {$i - 1}]]
-	    set leftover($inst) {}
-	} else {
-	    set cmit [string range $stuff $start [expr {$i - 1}]]
-	}
-	set start [expr {$i + 1}]
-	set j [string first "\n" $cmit]
-	set ok 0
-	set listed 1
-	if {$j >= 0 && [string match "commit *" $cmit]} {
-	    set ids [string range $cmit 7 [expr {$j - 1}]]
-	    if {[string match {[-^<>]*} $ids]} {
-		switch -- [string index $ids 0] {
-		    "-" {set listed 0}
-		    "^" {set listed 2}
-		    "<" {set listed 3}
-		    ">" {set listed 4}
-		}
-		set ids [string range $ids 1 end]
-	    }
-	    set ok 1
-	    foreach id $ids {
-		if {[string length $id] != 40} {
-		    set ok 0
-		    break
-		}
-	    }
-	}
-	if {!$ok} {
-	    set shortcmit $cmit
-	    if {[string length $shortcmit] > 80} {
-		set shortcmit "[string range $shortcmit 0 80]..."
-	    }
-	    error_popup "[mc "Can't parse git log output:"] {$shortcmit}"
-	    exit 1
-	}
-	set id [lindex $ids 0]
-	set vid $view,$id
+        set i [string first "\0" $stuff $start]
+        if {$i < 0} {
+            append leftover($inst) [string range $stuff $start end]
+            break
+        }
+        if {$start == 0} {
+            set cmit $leftover($inst)
+            append cmit [string range $stuff 0 [expr {$i - 1}]]
+            set leftover($inst) {}
+        } else {
+            set cmit [string range $stuff $start [expr {$i - 1}]]
+        }
+        set start [expr {$i + 1}]
+        set j [string first "\n" $cmit]
+        set ok 0
+        set listed 1
+        if {$j >= 0 && [string match "commit *" $cmit]} {
+            set ids [string range $cmit 7 [expr {$j - 1}]]
+            if {[string match {[-^<>]*} $ids]} {
+                switch -- [string index $ids 0] {
+                    "-" {set listed 0}
+                    "^" {set listed 2}
+                    "<" {set listed 3}
+                    ">" {set listed 4}
+                }
+                set ids [string range $ids 1 end]
+            }
+            set ok 1
+            foreach id $ids {
+                if {[string length $id] != 40} {
+                    set ok 0
+                    break
+                }
+            }
+        }
+        if {!$ok} {
+            set shortcmit $cmit
+            if {[string length $shortcmit] > 80} {
+                set shortcmit "[string range $shortcmit 0 80]..."
+            }
+            error_popup "[mc "Can't parse git log output:"] {$shortcmit}"
+            exit 1
+        }
+        set id [lindex $ids 0]
+        set vid $view,$id
 
-	lappend vshortids($view,[string range $id 0 3]) $id
+        lappend vshortids($view,[string range $id 0 3]) $id
 
-	if {!$listed && $updating && ![info exists varcid($vid)] &&
-	    $vfilelimit($view) ne {}} {
-	    # git log doesn't rewrite parents for unlisted commits
-	    # when doing path limiting, so work around that here
-	    # by working out the rewritten parent with git rev-list
-	    # and if we already know about it, using the rewritten
-	    # parent as a substitute parent for $id's children.
-	    if {![catch {
-		set rwid [exec git rev-list --first-parent --max-count=1 \
-			      $id -- $vfilelimit($view)]
-	    }]} {
-		if {$rwid ne {} && [info exists varcid($view,$rwid)]} {
-		    # use $rwid in place of $id
-		    rewrite_commit $view $id $rwid
-		    continue
-		}
-	    }
-	}
+        if {!$listed && $updating && ![info exists varcid($vid)] &&
+            $vfilelimit($view) ne {}} {
+            # git log doesn't rewrite parents for unlisted commits
+            # when doing path limiting, so work around that here
+            # by working out the rewritten parent with git rev-list
+            # and if we already know about it, using the rewritten
+            # parent as a substitute parent for $id's children.
+            if {![catch {
+                set rwid [exec git rev-list --first-parent --max-count=1 \
+                              $id -- $vfilelimit($view)]
+            }]} {
+                if {$rwid ne {} && [info exists varcid($view,$rwid)]} {
+                    # use $rwid in place of $id
+                    rewrite_commit $view $id $rwid
+                    continue
+                }
+            }
+        }
 
-	set a 0
-	if {[info exists varcid($vid)]} {
-	    if {$cmitlisted($vid) || !$listed} continue
-	    set a $varcid($vid)
-	}
-	if {$listed} {
-	    set olds [lrange $ids 1 end]
-	} else {
-	    set olds {}
-	}
-	set commitdata($id) [string range $cmit [expr {$j + 1}] end]
-	set cmitlisted($vid) $listed
-	set parents($vid) $olds
-	if {![info exists children($vid)]} {
-	    set children($vid) {}
-	} elseif {$a == 0 && [llength $children($vid)] == 1} {
-	    set k [lindex $children($vid) 0]
-	    if {[llength $parents($view,$k)] == 1 &&
-		(!$vdatemode($view) ||
-		 $varcid($view,$k) == [llength $varctok($view)] - 1)} {
-		set a $varcid($view,$k)
-	    }
-	}
-	if {$a == 0} {
-	    # new arc
-	    set a [newvarc $view $id]
-	}
-	if {[string compare [lindex $varctok($view) $a] $vtokmod($view)] < 0} {
-	    modify_arc $view $a
-	}
-	if {![info exists varcid($vid)]} {
-	    set varcid($vid) $a
-	    lappend varccommits($view,$a) $id
-	    incr commitidx($view)
-	}
+        set a 0
+        if {[info exists varcid($vid)]} {
+            if {$cmitlisted($vid) || !$listed} continue
+            set a $varcid($vid)
+        }
+        if {$listed} {
+            set olds [lrange $ids 1 end]
+        } else {
+            set olds {}
+        }
+        set commitdata($id) [string range $cmit [expr {$j + 1}] end]
+        set cmitlisted($vid) $listed
+        set parents($vid) $olds
+        if {![info exists children($vid)]} {
+            set children($vid) {}
+        } elseif {$a == 0 && [llength $children($vid)] == 1} {
+            set k [lindex $children($vid) 0]
+            if {[llength $parents($view,$k)] == 1 &&
+                (!$vdatemode($view) ||
+                 $varcid($view,$k) == [llength $varctok($view)] - 1)} {
+                set a $varcid($view,$k)
+            }
+        }
+        if {$a == 0} {
+            # new arc
+            set a [newvarc $view $id]
+        }
+        if {[string compare [lindex $varctok($view) $a] $vtokmod($view)] < 0} {
+            modify_arc $view $a
+        }
+        if {![info exists varcid($vid)]} {
+            set varcid($vid) $a
+            lappend varccommits($view,$a) $id
+            incr commitidx($view)
+        }
 
-	set i 0
-	foreach p $olds {
-	    if {$i == 0 || [lsearch -exact $olds $p] >= $i} {
-		set vp $view,$p
-		if {[llength [lappend children($vp) $id]] > 1 &&
-		    [vtokcmp $view [lindex $children($vp) end-1] $id] > 0} {
-		    set children($vp) [lsort -command [list vtokcmp $view] \
-					   $children($vp)]
-		    unset -nocomplain ordertok
-		}
-		if {[info exists varcid($view,$p)]} {
-		    fix_reversal $p $a $view
-		}
-	    }
-	    incr i
-	}
+        set i 0
+        foreach p $olds {
+            if {$i == 0 || [lsearch -exact $olds $p] >= $i} {
+                set vp $view,$p
+                if {[llength [lappend children($vp) $id]] > 1 &&
+                    [vtokcmp $view [lindex $children($vp) end-1] $id] > 0} {
+                    set children($vp) [lsort -command [list vtokcmp $view] \
+                                           $children($vp)]
+                    unset -nocomplain ordertok
+                }
+                if {[info exists varcid($view,$p)]} {
+                    fix_reversal $p $a $view
+                }
+            }
+            incr i
+        }
 
-	set scripts [check_interest $id $scripts]
-	set gotsome 1
+        set scripts [check_interest $id $scripts]
+        set gotsome 1
     }
     if {$gotsome} {
-	global numcommits hlview
+        global numcommits hlview
 
-	if {$view == $curview} {
-	    set numcommits $commitidx($view)
-	    run chewcommits
-	}
-	if {[info exists hlview] && $view == $hlview} {
-	    # we never actually get here...
-	    run vhighlightmore
-	}
-	foreach s $scripts {
-	    eval $s
-	}
+        if {$view == $curview} {
+            set numcommits $commitidx($view)
+            run chewcommits
+        }
+        if {[info exists hlview] && $view == $hlview} {
+            # we never actually get here...
+            run vhighlightmore
+        }
+        foreach s $scripts {
+            eval $s
+        }
     }
     return 2
 }
@@ -1619,28 +1618,28 @@ proc chewcommits {} {
 
     layoutmore
     if {$viewcomplete($curview)} {
-	global commitidx varctok
-	global numcommits startmsecs
+        global commitidx varctok
+        global numcommits startmsecs
 
-	if {[info exists pending_select]} {
-	    update
-	    reset_pending_select {}
+        if {[info exists pending_select]} {
+            update
+            reset_pending_select {}
 
-	    if {[commitinview $pending_select $curview]} {
-		selectline [rowofcommit $pending_select] 1
-	    } else {
-		set row [first_real_row]
-		selectline $row 1
-	    }
-	}
-	if {$commitidx($curview) > 0} {
-	    #set ms [expr {[clock clicks -milliseconds] - $startmsecs}]
-	    #puts "overall $ms ms for $numcommits commits"
-	    #puts "[llength $varctok($view)] arcs, $commitidx($view) commits"
-	} else {
-	    show_status [mc "No commits selected"]
-	}
-	notbusy layout
+            if {[commitinview $pending_select $curview]} {
+                selectline [rowofcommit $pending_select] 1
+            } else {
+                set row [first_real_row]
+                selectline $row 1
+            }
+        }
+        if {$commitidx($curview) > 0} {
+            #set ms [expr {[clock clicks -milliseconds] - $startmsecs}]
+            #puts "overall $ms ms for $numcommits commits"
+            #puts "[llength $varctok($view)] arcs, $commitidx($view) commits"
+        } else {
+            show_status [mc "No commits selected"]
+        }
+        notbusy layout
     }
     return 0
 }
@@ -1653,7 +1652,7 @@ proc do_readcommit {id} {
     # Read the results using i18n.logoutputencoding
     fconfigure $fd -translation lf -eofchar {}
     if {$tclencoding != {}} {
-	fconfigure $fd -encoding $tclencoding
+        fconfigure $fd -encoding $tclencoding
     }
     set contents [read $fd]
     close $fd
@@ -1680,44 +1679,44 @@ proc parsecommit {id contents listed} {
     set comdate {}
     set hdrend [string first "\n\n" $contents]
     if {$hdrend < 0} {
-	# should never happen...
-	set hdrend [string length $contents]
+        # should never happen...
+        set hdrend [string length $contents]
     }
     set header [string range $contents 0 [expr {$hdrend - 1}]]
     set comment [string range $contents [expr {$hdrend + 2}] end]
     foreach line [split $header "\n"] {
-	set line [split $line " "]
-	set tag [lindex $line 0]
-	if {$tag == "author"} {
-	    set audate [lrange $line end-1 end]
-	    set auname [join [lrange $line 1 end-2] " "]
-	} elseif {$tag == "committer"} {
-	    set comdate [lrange $line end-1 end]
-	    set comname [join [lrange $line 1 end-2] " "]
-	}
+        set line [split $line " "]
+        set tag [lindex $line 0]
+        if {$tag == "author"} {
+            set audate [lrange $line end-1 end]
+            set auname [join [lrange $line 1 end-2] " "]
+        } elseif {$tag == "committer"} {
+            set comdate [lrange $line end-1 end]
+            set comname [join [lrange $line 1 end-2] " "]
+        }
     }
     set headline {}
     # take the first non-blank line of the comment as the headline
     set headline [string trimleft $comment]
     set i [string first "\n" $headline]
     if {$i >= 0} {
-	set headline [string range $headline 0 $i]
+        set headline [string range $headline 0 $i]
     }
     set headline [string trimright $headline]
     set i [string first "\r" $headline]
     if {$i >= 0} {
-	set headline [string trimright [string range $headline 0 $i]]
+        set headline [string trimright [string range $headline 0 $i]]
     }
     if {!$listed} {
-	# git log indents the comment by 4 spaces;
-	# if we got this via git cat-file, add the indentation
-	set newcomment {}
-	foreach line [split $comment "\n"] {
-	    append newcomment "    "
-	    append newcomment $line
-	    append newcomment "\n"
-	}
-	set comment $newcomment
+        # git log indents the comment by 4 spaces;
+        # if we got this via git cat-file, add the indentation
+        set newcomment {}
+        foreach line [split $comment "\n"] {
+            append newcomment "    "
+            append newcomment $line
+            append newcomment "\n"
+        }
+        set comment $newcomment
     }
     set hasnote [string first "\nNotes:\n" $contents]
     set diff ""
@@ -1726,23 +1725,23 @@ proc parsecommit {id contents listed} {
     # diff.
     set i [string first "\n\ndiff" $comment]
     if {$i >= 0} {
-	set diff [string range $comment $i+1 end]
-	set comment [string range $comment 0 $i-1]
+        set diff [string range $comment $i+1 end]
+        set comment [string range $comment 0 $i-1]
     }
     set commitinfo($id) [list $headline $auname $audate \
-			     $comname $comdate $comment $hasnote $diff]
+                             $comname $comdate $comment $hasnote $diff]
 }
 
 proc getcommit {id} {
     global commitdata commitinfo
 
     if {[info exists commitdata($id)]} {
-	parsecommit $id $commitdata($id) 1
+        parsecommit $id $commitdata($id) 1
     } else {
-	readcommit $id
-	if {![info exists commitinfo($id)]} {
-	    set commitinfo($id) [list [mc "No commit information available"]]
-	}
+        readcommit $id
+        if {![info exists commitinfo($id)]} {
+            set commitinfo($id) [list [mc "No commit information available"]]
+        }
     }
     return 1
 }
@@ -1755,22 +1754,22 @@ proc longid {prefix} {
 
     set ids {}
     if {[string length $prefix] >= 4} {
-	set vshortid $curview,[string range $prefix 0 3]
-	if {[info exists vshortids($vshortid)]} {
-	    foreach id $vshortids($vshortid) {
-		if {[string match "$prefix*" $id]} {
-		    if {[lsearch -exact $ids $id] < 0} {
-			lappend ids $id
-			if {[llength $ids] >= 2} break
-		    }
-		}
-	    }
-	}
+        set vshortid $curview,[string range $prefix 0 3]
+        if {[info exists vshortids($vshortid)]} {
+            foreach id $vshortids($vshortid) {
+                if {[string match "$prefix*" $id]} {
+                    if {[lsearch -exact $ids $id] < 0} {
+                        lappend ids $id
+                        if {[llength $ids] >= 2} break
+                    }
+                }
+            }
+        }
     } else {
-	foreach match [array names varcid "$curview,$prefix*"] {
-	    lappend ids [lindex [split $match ","] 1]
-	    if {[llength $ids] >= 2} break
-	}
+        foreach match [array names varcid "$curview,$prefix*"] {
+            lappend ids [lindex [split $match ","] 1]
+            if {[llength $ids] >= 2} break
+        }
     }
     return $ids
 }
@@ -1780,57 +1779,61 @@ proc readrefs {} {
     global otherrefids idotherrefs mainhead mainheadid
     global selecthead selectheadid
     global hideremotes
+    global tclencoding
 
     foreach v {tagids idtags headids idheads otherrefids idotherrefs} {
-	unset -nocomplain $v
+        unset -nocomplain $v
     }
     set refd [open [list | git show-ref -d] r]
+    if {$tclencoding != {}} {
+        fconfigure $refd -encoding $tclencoding
+    }
     while {[gets $refd line] >= 0} {
-	if {[string index $line 40] ne " "} continue
-	set id [string range $line 0 39]
-	set ref [string range $line 41 end]
-	if {![string match "refs/*" $ref]} continue
-	set name [string range $ref 5 end]
-	if {[string match "remotes/*" $name]} {
-	    if {![string match "*/HEAD" $name] && !$hideremotes} {
-		set headids($name) $id
-		lappend idheads($id) $name
-	    }
-	} elseif {[string match "heads/*" $name]} {
-	    set name [string range $name 6 end]
-	    set headids($name) $id
-	    lappend idheads($id) $name
-	} elseif {[string match "tags/*" $name]} {
-	    # this lets refs/tags/foo^{} overwrite refs/tags/foo,
-	    # which is what we want since the former is the commit ID
-	    set name [string range $name 5 end]
-	    if {[string match "*^{}" $name]} {
-		set name [string range $name 0 end-3]
-	    } else {
-		set tagobjid($name) $id
-	    }
-	    set tagids($name) $id
-	    lappend idtags($id) $name
-	} else {
-	    set otherrefids($name) $id
-	    lappend idotherrefs($id) $name
-	}
+        if {[string index $line 40] ne " "} continue
+        set id [string range $line 0 39]
+        set ref [string range $line 41 end]
+        if {![string match "refs/*" $ref]} continue
+        set name [string range $ref 5 end]
+        if {[string match "remotes/*" $name]} {
+            if {![string match "*/HEAD" $name] && !$hideremotes} {
+                set headids($name) $id
+                lappend idheads($id) $name
+            }
+        } elseif {[string match "heads/*" $name]} {
+            set name [string range $name 6 end]
+            set headids($name) $id
+            lappend idheads($id) $name
+        } elseif {[string match "tags/*" $name]} {
+            # this lets refs/tags/foo^{} overwrite refs/tags/foo,
+            # which is what we want since the former is the commit ID
+            set name [string range $name 5 end]
+            if {[string match "*^{}" $name]} {
+                set name [string range $name 0 end-3]
+            } else {
+                set tagobjid($name) $id
+            }
+            set tagids($name) $id
+            lappend idtags($id) $name
+        } else {
+            set otherrefids($name) $id
+            lappend idotherrefs($id) $name
+        }
     }
     catch {close $refd}
     set mainhead {}
     set mainheadid {}
     catch {
-	set mainheadid [exec git rev-parse HEAD]
-	set thehead [exec git symbolic-ref HEAD]
-	if {[string match "refs/heads/*" $thehead]} {
-	    set mainhead [string range $thehead 11 end]
-	}
+        set mainheadid [exec git rev-parse HEAD]
+        set thehead [exec git symbolic-ref HEAD]
+        if {[string match "refs/heads/*" $thehead]} {
+            set mainhead [string range $thehead 11 end]
+        }
     }
     set selectheadid {}
     if {$selecthead ne {}} {
-	catch {
-	    set selectheadid [exec git rev-parse --verify $selecthead]
-	}
+        catch {
+            set selectheadid [exec git rev-parse --verify $selecthead]
+        }
     }
 }
 
@@ -1839,10 +1842,10 @@ proc first_real_row {} {
     global nullid nullid2 numcommits
 
     for {set row 0} {$row < $numcommits} {incr row} {
-	set id [commitonrow $row]
-	if {$id ne $nullid && $id ne $nullid2} {
-	    break
-	}
+        set id [commitonrow $row]
+        if {$id ne $nullid && $id ne $nullid2} {
+            break
+        }
     }
     return $row
 }
@@ -1861,12 +1864,12 @@ proc removehead {id name} {
     global headids idheads
 
     if {$idheads($id) eq $name} {
-	unset idheads($id)
+        unset idheads($id)
     } else {
-	set i [lsearch -exact $idheads($id) $name]
-	if {$i >= 0} {
-	    set idheads($id) [lreplace $idheads($id) $i $i]
-	}
+        set i [lsearch -exact $idheads($id) $name]
+        if {$i >= 0} {
+            set idheads($id) [lreplace $idheads($id) $i $i]
+        }
     }
     unset headids($name)
 }
@@ -1894,7 +1897,7 @@ proc make_transient {window origin} {
     # Windows fails to place transient windows normally, so
     # schedule a callback to center them on the parent.
     if {[tk windowingsystem] eq {win32}} {
-	after idle [list tk::PlaceWindow $window widget $origin]
+        after idle [list tk::PlaceWindow $window widget $origin]
     }
 }
 
@@ -1994,41 +1997,41 @@ proc setttkstyle {} {
 proc makemenu {m items} {
     menu $m
     if {[tk windowingsystem] eq {aqua}} {
-	set Meta1 Cmd
+        set Meta1 Cmd
     } else {
-	set Meta1 Ctrl
+        set Meta1 Ctrl
     }
     foreach i $items {
-	set name [mc [lindex $i 1]]
-	set type [lindex $i 2]
-	set thing [lindex $i 3]
-	set params [list $type]
-	if {$name ne {}} {
-	    set u [string first "&" [string map {&& x} $name]]
-	    lappend params -label [string map {&& & & {}} $name]
-	    if {$u >= 0} {
-		lappend params -underline $u
-	    }
-	}
-	switch -- $type {
-	    "cascade" {
-		set submenu [string tolower [string map {& ""} [lindex $i 1]]]
-		lappend params -menu $m.$submenu
-	    }
-	    "command" {
-		lappend params -command $thing
-	    }
-	    "radiobutton" {
-		lappend params -variable [lindex $thing 0] \
-		    -value [lindex $thing 1]
-	    }
-	}
-	set tail [lrange $i 4 end]
-	regsub -all {\yMeta1\y} $tail $Meta1 tail
-	eval $m add $params $tail
-	if {$type eq "cascade"} {
-	    makemenu $m.$submenu $thing
-	}
+        set name [mc [lindex $i 1]]
+        set type [lindex $i 2]
+        set thing [lindex $i 3]
+        set params [list $type]
+        if {$name ne {}} {
+            set u [string first "&" [string map {&& x} $name]]
+            lappend params -label [string map {&& & & {}} $name]
+            if {$u >= 0} {
+                lappend params -underline $u
+            }
+        }
+        switch -- $type {
+            "cascade" {
+                set submenu [string tolower [string map {& ""} [lindex $i 1]]]
+                lappend params -menu $m.$submenu
+            }
+            "command" {
+                lappend params -command $thing
+            }
+            "radiobutton" {
+                lappend params -variable [lindex $thing 0] \
+                    -value [lindex $thing 1]
+            }
+        }
+        set tail [lrange $i 4 end]
+        regsub -all {\yMeta1\y} $tail $Meta1 tail
+        eval $m add $params $tail
+        if {$type eq "cascade"} {
+            makemenu $m.$submenu $thing
+        }
     }
 }
 
@@ -2048,12 +2051,12 @@ proc makedroplist {w varname args} {
             set cx [string length $label]
             if {$cx > $width} {set width $cx}
         }
-	set gm [ttk::combobox $w -width $width -state readonly\
-		    -textvariable $varname -values $args \
-		    -exportselection false]
-	bind $gm <<ComboboxSelected>> [list $gm selection clear]
+        set gm [ttk::combobox $w -width $width -state readonly\
+                    -textvariable $varname -values $args \
+                    -exportselection false]
+        bind $gm <<ComboboxSelected>> [list $gm selection clear]
     } else {
-	set gm [eval [linsert $args 0 tk_optionMenu $w $varname]]
+        set gm [eval [linsert $args 0 tk_optionMenu $w $varname]]
     }
     return $gm
 }
@@ -2069,7 +2072,7 @@ proc makewindow {} {
     global rowctxmenu fakerowmenu mergemax wrapcomment
     global highlight_files gdttype
     global searchstring sstring
-    global bgcolor fgcolor bglist fglist diffcolors selectbgcolor
+    global bgcolor fgcolor bglist fglist diffcolors diffbgcolors selectbgcolor
     global uifgcolor uifgdisabledcolor
     global filesepbgcolor filesepfgcolor
     global mergecolors foundbgcolor currentsearchhitbgcolor
@@ -2083,49 +2086,49 @@ proc makewindow {} {
     # The "mc" arguments here are purely so that xgettext
     # sees the following string as needing to be translated
     set file {
-	mc "&File" cascade {
-	    {mc "&Update" command updatecommits -accelerator F5}
-	    {mc "&Reload" command reloadcommits -accelerator Shift-F5}
-	    {mc "Reread re&ferences" command rereadrefs}
-	    {mc "&List references" command showrefs -accelerator F2}
-	    {xx "" separator}
-	    {mc "Start git &gui" command {exec git gui &}}
-	    {xx "" separator}
-	    {mc "&Quit" command doquit -accelerator Meta1-Q}
-	}}
+        mc "&File" cascade {
+            {mc "&Update" command updatecommits -accelerator F5}
+            {mc "&Reload" command reloadcommits -accelerator Shift-F5}
+            {mc "Reread re&ferences" command rereadrefs}
+            {mc "&List references" command showrefs -accelerator F2}
+            {xx "" separator}
+            {mc "Start git &gui" command {exec git gui &}}
+            {xx "" separator}
+            {mc "&Quit" command doquit -accelerator Meta1-Q}
+        }}
     set edit {
-	mc "&Edit" cascade {
-	    {mc "&Preferences" command doprefs}
-	}}
+        mc "&Edit" cascade {
+            {mc "&Preferences" command doprefs}
+        }}
     set view {
-	mc "&View" cascade {
-	    {mc "&New view..." command {newview 0} -accelerator Shift-F4}
-	    {mc "&Edit view..." command editview -state disabled -accelerator F4}
-	    {mc "&Delete view" command delview -state disabled}
-	    {xx "" separator}
-	    {mc "&All files" radiobutton {selectedview 0} -command {showview 0}}
-	}}
+        mc "&View" cascade {
+            {mc "&New view..." command {newview 0} -accelerator Shift-F4}
+            {mc "&Edit view..." command editview -state disabled -accelerator F4}
+            {mc "&Delete view" command delview -state disabled}
+            {xx "" separator}
+            {mc "&All files" radiobutton {selectedview 0} -command {showview 0}}
+        }}
     if {[tk windowingsystem] ne "aqua"} {
-	set help {
-	mc "&Help" cascade {
-	    {mc "&About gitk" command about}
-	    {mc "&Key bindings" command keys}
-	}}
-	set bar [list $file $edit $view $help]
+        set help {
+        mc "&Help" cascade {
+            {mc "&About gitk" command about}
+            {mc "&Key bindings" command keys}
+        }}
+        set bar [list $file $edit $view $help]
     } else {
-	proc ::tk::mac::ShowPreferences {} {doprefs}
-	proc ::tk::mac::Quit {} {doquit}
-	lset file end [lreplace [lindex $file end] end-1 end]
-	set apple {
-	xx "&Apple" cascade {
-	    {mc "&About gitk" command about}
-	    {xx "" separator}
-	}}
-	set help {
-	mc "&Help" cascade {
-	    {mc "&Key bindings" command keys}
-	}}
-	set bar [list $apple $file $view $help]
+        proc ::tk::mac::ShowPreferences {} {doprefs}
+        proc ::tk::mac::Quit {} {doquit}
+        lset file end [lreplace [lindex $file end] end-1 end]
+        set apple {
+        xx "&Apple" cascade {
+            {mc "&About gitk" command about}
+            {xx "" separator}
+        }}
+        set help {
+        mc "&Help" cascade {
+            {mc "&Key bindings" command keys}
+        }}
+        set bar [list $apple $file $view $help]
     }
     makemenu .bar $bar
     . configure -menu .bar
@@ -2153,36 +2156,36 @@ proc makewindow {} {
     ${NS}::frame .tf.histframe
     ${NS}::panedwindow .tf.histframe.pwclist -orient horizontal
     if {!$use_ttk} {
-	.tf.histframe.pwclist configure -sashpad 0 -handlesize 4
+        .tf.histframe.pwclist configure -sashpad 0 -handlesize 4
     }
 
     # create three canvases
     set cscroll .tf.histframe.csb
     set canv .tf.histframe.pwclist.canv
     canvas $canv \
-	-selectbackground $selectbgcolor \
-	-background $bgcolor -bd 0 \
-	-yscrollincr $linespc -yscrollcommand "scrollcanv $cscroll"
+        -selectbackground $selectbgcolor \
+        -background $bgcolor -bd 0 \
+        -yscrollincr $linespc -yscrollcommand "scrollcanv $cscroll"
     .tf.histframe.pwclist add $canv
     set canv2 .tf.histframe.pwclist.canv2
     canvas $canv2 \
-	-selectbackground $selectbgcolor \
-	-background $bgcolor -bd 0 -yscrollincr $linespc
+        -selectbackground $selectbgcolor \
+        -background $bgcolor -bd 0 -yscrollincr $linespc
     .tf.histframe.pwclist add $canv2
     set canv3 .tf.histframe.pwclist.canv3
     canvas $canv3 \
-	-selectbackground $selectbgcolor \
-	-background $bgcolor -bd 0 -yscrollincr $linespc
+        -selectbackground $selectbgcolor \
+        -background $bgcolor -bd 0 -yscrollincr $linespc
     .tf.histframe.pwclist add $canv3
     if {$use_ttk} {
-	bind .tf.histframe.pwclist <Map> {
-	    bind %W <Map> {}
-	    .tf.histframe.pwclist sashpos 1 [lindex $::geometry(pwsash1) 0]
-	    .tf.histframe.pwclist sashpos 0 [lindex $::geometry(pwsash0) 0]
-	}
+        bind .tf.histframe.pwclist <Map> {
+            bind %W <Map> {}
+            .tf.histframe.pwclist sashpos 1 [lindex $::geometry(pwsash1) 0]
+            .tf.histframe.pwclist sashpos 0 [lindex $::geometry(pwsash0) 0]
+        }
     } else {
-	eval .tf.histframe.pwclist sash place 0 $geometry(pwsash0)
-	eval .tf.histframe.pwclist sash place 1 $geometry(pwsash1)
+        eval .tf.histframe.pwclist sash place 0 $geometry(pwsash0)
+        eval .tf.histframe.pwclist sash place 1 $geometry(pwsash1)
     }
 
     # a scroll bar to rule them
@@ -2201,7 +2204,7 @@ proc makewindow {} {
     set entries $sha1entry
     set sha1but .tf.bar.sha1label
     button $sha1but -text "[mc "SHA1 ID:"] " -state disabled -relief flat \
-	-command gotocommit -width 8
+        -command gotocommit -width 8
     $sha1but conf -disabledforeground [$sha1but cget -foreground]
     pack .tf.bar.sha1label -side left
     ${NS}::entry $sha1entry -width 40 -font textfont -textvariable sha1string
@@ -2209,20 +2212,20 @@ proc makewindow {} {
     pack $sha1entry -side left -pady 2
 
     set bm_left_data {
-	#define left_width 16
-	#define left_height 16
-	static unsigned char left_bits[] = {
-	0x00, 0x00, 0xc0, 0x01, 0xe0, 0x00, 0x70, 0x00, 0x38, 0x00, 0x1c, 0x00,
-	0x0e, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x0e, 0x00, 0x1c, 0x00,
-	0x38, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xc0, 0x01};
+        #define left_width 16
+        #define left_height 16
+        static unsigned char left_bits[] = {
+        0x00, 0x00, 0xc0, 0x01, 0xe0, 0x00, 0x70, 0x00, 0x38, 0x00, 0x1c, 0x00,
+        0x0e, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x0e, 0x00, 0x1c, 0x00,
+        0x38, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xc0, 0x01};
     }
     set bm_right_data {
-	#define right_width 16
-	#define right_height 16
-	static unsigned char right_bits[] = {
-	0x00, 0x00, 0xc0, 0x01, 0x80, 0x03, 0x00, 0x07, 0x00, 0x0e, 0x00, 0x1c,
-	0x00, 0x38, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x38, 0x00, 0x1c,
-	0x00, 0x0e, 0x00, 0x07, 0x80, 0x03, 0xc0, 0x01};
+        #define right_width 16
+        #define right_height 16
+        static unsigned char right_bits[] = {
+        0x00, 0x00, 0xc0, 0x01, 0x80, 0x03, 0x00, 0x07, 0x00, 0x0e, 0x00, 0x1c,
+        0x00, 0x38, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x38, 0x00, 0x1c,
+        0x00, 0x0e, 0x00, 0x07, 0x80, 0x03, 0xc0, 0x01};
     }
     image create bitmap bm-left -data $bm_left_data -foreground $uifgcolor
     image create bitmap bm-left-gray -data $bm_left_data -foreground $uifgdisabledcolor
@@ -2231,28 +2234,28 @@ proc makewindow {} {
 
     ${NS}::button .tf.bar.leftbut -command goback -state disabled -width 26
     if {$use_ttk} {
-	.tf.bar.leftbut configure -image [list bm-left disabled bm-left-gray]
+        .tf.bar.leftbut configure -image [list bm-left disabled bm-left-gray]
     } else {
-	.tf.bar.leftbut configure -image bm-left
+        .tf.bar.leftbut configure -image bm-left
     }
     pack .tf.bar.leftbut -side left -fill y
     ${NS}::button .tf.bar.rightbut -command goforw -state disabled -width 26
     if {$use_ttk} {
-	.tf.bar.rightbut configure -image [list bm-right disabled bm-right-gray]
+        .tf.bar.rightbut configure -image [list bm-right disabled bm-right-gray]
     } else {
-	.tf.bar.rightbut configure -image bm-right
+        .tf.bar.rightbut configure -image bm-right
     }
     pack .tf.bar.rightbut -side left -fill y
 
     ${NS}::label .tf.bar.rowlabel -text [mc "Row"]
     set rownumsel {}
     ${NS}::label .tf.bar.rownum -width 7 -textvariable rownumsel \
-	-relief sunken -anchor e
+        -relief sunken -anchor e
     ${NS}::label .tf.bar.rowlabel2 -text "/"
     ${NS}::label .tf.bar.numcommits -width 7 -textvariable numcommits \
-	-relief sunken -anchor e
+        -relief sunken -anchor e
     pack .tf.bar.rowlabel .tf.bar.rownum .tf.bar.rowlabel2 .tf.bar.numcommits \
-	-side left
+        -side left
     if {!$use_ttk} {
         foreach w {rownum numcommits} {.tf.bar.$w configure -font textfont}
     }
@@ -2264,14 +2267,14 @@ proc makewindow {} {
     ${NS}::label $statusw -width 15 -relief sunken
     pack $statusw -side left -padx 5
     if {$use_ttk} {
-	set progresscanv [ttk::progressbar .tf.bar.progress]
+        set progresscanv [ttk::progressbar .tf.bar.progress]
     } else {
-	set h [expr {[font metrics uifont -linespace] + 2}]
-	set progresscanv .tf.bar.progress
-	canvas $progresscanv -relief sunken -height $h -borderwidth 2
-	set progressitem [$progresscanv create rect -1 0 0 $h -fill "#00ff00"]
-	set fprogitem [$progresscanv create rect -1 0 0 $h -fill yellow]
-	set rprogitem [$progresscanv create rect -1 0 0 $h -fill red]
+        set h [expr {[font metrics uifont -linespace] + 2}]
+        set progresscanv .tf.bar.progress
+        canvas $progresscanv -relief sunken -height $h -borderwidth 2
+        set progressitem [$progresscanv create rect -1 0 0 $h -fill "#00ff00"]
+        set fprogitem [$progresscanv create rect -1 0 0 $h -fill yellow]
+        set rprogitem [$progresscanv create rect -1 0 0 $h -fill red]
     }
     pack $progresscanv -side right -expand 1 -fill x -padx {0 2}
     set progresscoords {0 0}
@@ -2285,26 +2288,26 @@ proc makewindow {} {
     ${NS}::label .tf.lbar.flabel -text "[mc "Find"] "
 
     set bm_down_data {
-	#define down_width 16
-	#define down_height 16
-	static unsigned char down_bits[] = {
-	0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
-	0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
-	0x87, 0xe1, 0x8e, 0x71, 0x9c, 0x39, 0xb8, 0x1d,
-	0xf0, 0x0f, 0xe0, 0x07, 0xc0, 0x03, 0x80, 0x01};
+        #define down_width 16
+        #define down_height 16
+        static unsigned char down_bits[] = {
+        0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
+        0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
+        0x87, 0xe1, 0x8e, 0x71, 0x9c, 0x39, 0xb8, 0x1d,
+        0xf0, 0x0f, 0xe0, 0x07, 0xc0, 0x03, 0x80, 0x01};
     }
     image create bitmap bm-down -data $bm_down_data -foreground $uifgcolor
     ${NS}::button .tf.lbar.fnext -width 26 -command {dofind 1 1}
     .tf.lbar.fnext configure -image bm-down
 
     set bm_up_data {
-	#define up_width 16
-	#define up_height 16
-	static unsigned char up_bits[] = {
-	0x80, 0x01, 0xc0, 0x03, 0xe0, 0x07, 0xf0, 0x0f,
-	0xb8, 0x1d, 0x9c, 0x39, 0x8e, 0x71, 0x87, 0xe1,
-	0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
-	0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01};
+        #define up_width 16
+        #define up_height 16
+        static unsigned char up_bits[] = {
+        0x80, 0x01, 0xc0, 0x03, 0xe0, 0x07, 0xf0, 0x0f,
+        0xb8, 0x1d, 0x9c, 0x39, 0x8e, 0x71, 0x87, 0xe1,
+        0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
+        0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01};
     }
     image create bitmap bm-up -data $bm_up_data -foreground $uifgcolor
     ${NS}::button .tf.lbar.fprev -width 26 -command {dofind -1 1}
@@ -2313,13 +2316,13 @@ proc makewindow {} {
     ${NS}::label .tf.lbar.flab2 -text " [mc "commit"] "
 
     pack .tf.lbar.flabel .tf.lbar.fnext .tf.lbar.fprev .tf.lbar.flab2 \
-	-side left -fill y
+        -side left -fill y
     set gdttype [mc "containing:"]
     set gm [makedroplist .tf.lbar.gdttype gdttype \
-		[mc "containing:"] \
-		[mc "touching paths:"] \
-		[mc "adding/removing string:"] \
-		[mc "changing lines matching:"]]
+                [mc "containing:"] \
+                [mc "touching paths:"] \
+                [mc "adding/removing string:"] \
+                [mc "changing lines matching:"]]
     trace add variable gdttype write gdttype_change
     pack .tf.lbar.gdttype -side left -fill y
 
@@ -2330,11 +2333,11 @@ proc makewindow {} {
     trace add variable findstring write find_change
     set findtype [mc "Exact"]
     set findtypemenu [makedroplist .tf.lbar.findtype \
-			  findtype [mc "Exact"] [mc "IgnCase"] [mc "Regexp"]]
+                          findtype [mc "Exact"] [mc "IgnCase"] [mc "Regexp"]]
     trace add variable findtype write findcom_change
     set findloc [mc "All fields"]
     makedroplist .tf.lbar.findloc findloc [mc "All fields"] [mc "Headline"] \
-	[mc "Comments"] [mc "Author"] [mc "Committer"]
+        [mc "Comments"] [mc "Author"] [mc "Committer"]
     trace add variable findloc write find_change
     pack .tf.lbar.findloc -side right
     pack .tf.lbar.findtype -side right
@@ -2346,8 +2349,8 @@ proc makewindow {} {
     pack .tf.histframe -fill both -side top -expand 1
     .ctop add .tf
     if {!$use_ttk} {
-	.ctop paneconfigure .tf -height $geometry(topheight)
-	.ctop paneconfigure .tf -width $geometry(topwidth)
+        .ctop paneconfigure .tf -height $geometry(topheight)
+        .ctop paneconfigure .tf -width $geometry(topwidth)
     }
 
     # now build up the bottom
@@ -2357,9 +2360,9 @@ proc makewindow {} {
     # if we know window height, then that will set the lower text height, otherwise
     # we set lower text height which will drive window height
     if {[info exists geometry(main)]} {
-	${NS}::frame .bleft -width $geometry(botwidth)
+        ${NS}::frame .bleft -width $geometry(botwidth)
     } else {
-	${NS}::frame .bleft -width $geometry(botwidth) -height $geometry(botheight)
+        ${NS}::frame .bleft -width $geometry(botwidth) -height $geometry(botheight)
     }
     ${NS}::frame .bleft.top
     ${NS}::frame .bleft.mid
@@ -2377,41 +2380,41 @@ proc makewindow {} {
     trace add variable searchstring write incrsearch
     pack $sstring -side left -expand 1 -fill x
     ${NS}::radiobutton .bleft.mid.diff -text [mc "Diff"] \
-	-command changediffdisp -variable diffelide -value {0 0}
+        -command changediffdisp -variable diffelide -value {0 0}
     ${NS}::radiobutton .bleft.mid.old -text [mc "Old version"] \
-	-command changediffdisp -variable diffelide -value {0 1}
+        -command changediffdisp -variable diffelide -value {0 1}
     ${NS}::radiobutton .bleft.mid.new -text [mc "New version"] \
-	-command changediffdisp -variable diffelide -value {1 0}
+        -command changediffdisp -variable diffelide -value {1 0}
 
     ${NS}::label .bleft.mid.labeldiffcontext -text "      [mc "Lines of context"]: "
     pack .bleft.mid.diff .bleft.mid.old .bleft.mid.new -side left -ipadx $wgap
     spinbox .bleft.mid.diffcontext -width 5 \
-	-from 0 -increment 1 -to 10000000 \
-	-validate all -validatecommand "diffcontextvalidate %P" \
-	-textvariable diffcontextstring
+        -from 0 -increment 1 -to 10000000 \
+        -validate all -validatecommand "diffcontextvalidate %P" \
+        -textvariable diffcontextstring
     .bleft.mid.diffcontext set $diffcontext
     trace add variable diffcontextstring write diffcontextchange
     lappend entries .bleft.mid.diffcontext
     pack .bleft.mid.labeldiffcontext .bleft.mid.diffcontext -side left -ipadx $wgap
     ${NS}::checkbutton .bleft.mid.ignspace -text [mc "Ignore space change"] \
-	-command changeignorespace -variable ignorespace
+        -command changeignorespace -variable ignorespace
     pack .bleft.mid.ignspace -side left -padx 5
 
     set worddiff [mc "Line diff"]
     if {[package vcompare $git_version "1.7.2"] >= 0} {
-	makedroplist .bleft.mid.worddiff worddiff [mc "Line diff"] \
-	    [mc "Markup words"] [mc "Color words"]
-	trace add variable worddiff write changeworddiff
-	pack .bleft.mid.worddiff -side left -padx 5
+        makedroplist .bleft.mid.worddiff worddiff [mc "Line diff"] \
+            [mc "Markup words"] [mc "Color words"]
+        trace add variable worddiff write changeworddiff
+        pack .bleft.mid.worddiff -side left -padx 5
     }
 
     set ctext .bleft.bottom.ctext
     text $ctext -background $bgcolor -foreground $fgcolor \
-	-state disabled -undo 0 -font textfont \
-	-yscrollcommand scrolltext -wrap none \
-	-xscrollcommand ".bleft.bottom.sbhorizontal set"
+        -state disabled -undo 0 -font textfont \
+        -yscrollcommand scrolltext -wrap none \
+        -xscrollcommand ".bleft.bottom.sbhorizontal set"
     if {$have_tk85} {
-	$ctext conf -tabstyle wordprocessor
+        $ctext conf -tabstyle wordprocessor
     }
     ${NS}::scrollbar .bleft.bottom.sb -command "$ctext yview"
     ${NS}::scrollbar .bleft.bottom.sbhorizontal -command "$ctext xview" -orient h
@@ -2430,7 +2433,9 @@ proc makewindow {} {
     $ctext tag conf filesep -font textfontbold -fore $filesepfgcolor -back $filesepbgcolor
     $ctext tag conf hunksep -fore [lindex $diffcolors 2]
     $ctext tag conf d0 -fore [lindex $diffcolors 0]
+    $ctext tag conf d0 -back [lindex $diffbgcolors 0]
     $ctext tag conf dresult -fore [lindex $diffcolors 1]
+    $ctext tag conf dresult -back [lindex $diffbgcolors 1]
     $ctext tag conf m0 -fore [lindex $mergecolors 0]
     $ctext tag conf m1 -fore [lindex $mergecolors 1]
     $ctext tag conf m2 -fore [lindex $mergecolors 2]
@@ -2455,38 +2460,44 @@ proc makewindow {} {
     $ctext tag conf currentsearchhit -back $currentsearchhitbgcolor
     $ctext tag conf wwrap -wrap word -lmargin2 1c
     $ctext tag conf bold -font textfontbold
+    # set these to the lowest priority:
+    $ctext tag lower currentsearchhit
+    $ctext tag lower found
+    $ctext tag lower filesep
+    $ctext tag lower dresult
+    $ctext tag lower d0
 
     .pwbottom add .bleft
     if {!$use_ttk} {
-	.pwbottom paneconfigure .bleft -width $geometry(botwidth)
+        .pwbottom paneconfigure .bleft -width $geometry(botwidth)
     }
 
     # lower right
     ${NS}::frame .bright
     ${NS}::frame .bright.mode
     ${NS}::radiobutton .bright.mode.patch -text [mc "Patch"] \
-	-command reselectline -variable cmitmode -value "patch"
+        -command reselectline -variable cmitmode -value "patch"
     ${NS}::radiobutton .bright.mode.tree -text [mc "Tree"] \
-	-command reselectline -variable cmitmode -value "tree"
+        -command reselectline -variable cmitmode -value "tree"
     grid .bright.mode.patch .bright.mode.tree -sticky ew
     pack .bright.mode -side top -fill x
     set cflist .bright.cfiles
     set indent [font measure mainfont "nn"]
     text $cflist \
-	-selectbackground $selectbgcolor \
-	-background $bgcolor -foreground $fgcolor \
-	-font mainfont \
-	-tabs [list $indent [expr {2 * $indent}]] \
-	-yscrollcommand ".bright.sb set" \
-	-cursor [. cget -cursor] \
-	-spacing1 1 -spacing3 1
+        -selectbackground $selectbgcolor \
+        -background $bgcolor -foreground $fgcolor \
+        -font mainfont \
+        -tabs [list $indent [expr {2 * $indent}]] \
+        -yscrollcommand ".bright.sb set" \
+        -cursor [. cget -cursor] \
+        -spacing1 1 -spacing3 1
     lappend bglist $cflist
     lappend fglist $cflist
     ${NS}::scrollbar .bright.sb -command "$cflist yview"
     pack .bright.sb -side right -fill y
     pack $cflist -side left -fill both -expand 1
     $cflist tag configure highlight \
-	-background [$cflist cget -selectbackground]
+        -background [$cflist cget -selectbackground]
     $cflist tag configure bold -font mainfontbold
 
     .pwbottom add .bright
@@ -2494,15 +2505,15 @@ proc makewindow {} {
 
     # restore window width & height if known
     if {[info exists geometry(main)]} {
-	if {[scan $geometry(main) "%dx%d" w h] >= 2} {
-	    if {$w > [winfo screenwidth .]} {
-		set w [winfo screenwidth .]
-	    }
-	    if {$h > [winfo screenheight .]} {
-		set h [winfo screenheight .]
-	    }
-	    wm geometry . "${w}x$h"
-	}
+        if {[scan $geometry(main) "%dx%d" w h] >= 2} {
+            if {$w > [winfo screenwidth .]} {
+                set w [winfo screenwidth .]
+            }
+            if {$h > [winfo screenheight .]} {
+                set h [winfo screenheight .]
+            }
+            wm geometry . "${w}x$h"
+        }
     }
 
     if {[info exists geometry(state)] && $geometry(state) eq "zoomed"} {
@@ -2526,25 +2537,25 @@ proc makewindow {} {
             bind %W <Map> {}
             %W sashpos 0 $::geometry(botwidth)
         }
+        bind .pwbottom <Configure> {resizecdetpanes %W %w}
     }
 
-    bind .pwbottom <Configure> {resizecdetpanes %W %w}
     pack .ctop -fill both -expand 1
     bindall <1> {selcanvline %W %x %y}
     #bindall <B1-Motion> {selcanvline %W %x %y}
     if {[tk windowingsystem] == "win32"} {
-	bind . <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D }
-	bind $ctext <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D ; break }
+        bind . <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D }
+        bind $ctext <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D ; break }
     } else {
-	bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
-	bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
-	bind $ctext <Button> {
-	    if {"%b" eq 6} {
-		$ctext xview scroll -5 units
-	    } elseif {"%b" eq 7} {
-		$ctext xview scroll 5 units
-	    }
-	}
+        bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
+        bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
+        bind $ctext <Button> {
+            if {"%b" eq 6} {
+                $ctext xview scroll -5 units
+            } elseif {"%b" eq 7} {
+                $ctext xview scroll 5 units
+            }
+        }
         if {[tk windowingsystem] eq "aqua"} {
             bindall <MouseWheel> {
                 set delta [expr {- (%D)}]
@@ -2627,7 +2638,7 @@ proc makewindow {} {
     bind $ctext <Button-1> {focus %W}
     bind $ctext <<Selection>> rehighlight_search_results
     for {set i 1} {$i < 10} {incr i} {
-	bind . <$M1B-Key-$i> [list go_to_parent $i]
+        bind . <$M1B-Key-$i> [list go_to_parent $i]
     }
 
     set maincursor [. cget -cursor]
@@ -2636,60 +2647,60 @@ proc makewindow {} {
 
     set rowctxmenu .rowctxmenu
     makemenu $rowctxmenu {
-	{mc "Diff this -> selected" command {diffvssel 0}}
-	{mc "Diff selected -> this" command {diffvssel 1}}
-	{mc "Make patch" command mkpatch}
-	{mc "Create tag" command mktag}
-	{mc "Copy commit summary" command copysummary}
-	{mc "Write commit to file" command writecommit}
-	{mc "Create new branch" command mkbranch}
-	{mc "Cherry-pick this commit" command cherrypick}
-	{mc "Reset HEAD branch to here" command resethead}
-	{mc "Mark this commit" command markhere}
-	{mc "Return to mark" command gotomark}
-	{mc "Find descendant of this and mark" command find_common_desc}
-	{mc "Compare with marked commit" command compare_commits}
-	{mc "Diff this -> marked commit" command {diffvsmark 0}}
-	{mc "Diff marked commit -> this" command {diffvsmark 1}}
-	{mc "Revert this commit" command revert}
+        {mc "Diff this -> selected" command {diffvssel 0}}
+        {mc "Diff selected -> this" command {diffvssel 1}}
+        {mc "Make patch" command mkpatch}
+        {mc "Create tag" command mktag}
+        {mc "Copy commit reference" command copyreference}
+        {mc "Write commit to file" command writecommit}
+        {mc "Create new branch" command mkbranch}
+        {mc "Cherry-pick this commit" command cherrypick}
+        {mc "Reset HEAD branch to here" command resethead}
+        {mc "Mark this commit" command markhere}
+        {mc "Return to mark" command gotomark}
+        {mc "Find descendant of this and mark" command find_common_desc}
+        {mc "Compare with marked commit" command compare_commits}
+        {mc "Diff this -> marked commit" command {diffvsmark 0}}
+        {mc "Diff marked commit -> this" command {diffvsmark 1}}
+        {mc "Revert this commit" command revert}
     }
     $rowctxmenu configure -tearoff 0
 
     set fakerowmenu .fakerowmenu
     makemenu $fakerowmenu {
-	{mc "Diff this -> selected" command {diffvssel 0}}
-	{mc "Diff selected -> this" command {diffvssel 1}}
-	{mc "Make patch" command mkpatch}
-	{mc "Diff this -> marked commit" command {diffvsmark 0}}
-	{mc "Diff marked commit -> this" command {diffvsmark 1}}
+        {mc "Diff this -> selected" command {diffvssel 0}}
+        {mc "Diff selected -> this" command {diffvssel 1}}
+        {mc "Make patch" command mkpatch}
+        {mc "Diff this -> marked commit" command {diffvsmark 0}}
+        {mc "Diff marked commit -> this" command {diffvsmark 1}}
     }
     $fakerowmenu configure -tearoff 0
 
     set headctxmenu .headctxmenu
     makemenu $headctxmenu {
-	{mc "Check out this branch" command cobranch}
-	{mc "Rename this branch" command mvbranch}
-	{mc "Remove this branch" command rmbranch}
-	{mc "Copy branch name" command {clipboard clear; clipboard append $headmenuhead}}
+        {mc "Check out this branch" command cobranch}
+        {mc "Rename this branch" command mvbranch}
+        {mc "Remove this branch" command rmbranch}
+        {mc "Copy branch name" command {clipboard clear; clipboard append $headmenuhead}}
     }
     $headctxmenu configure -tearoff 0
 
     global flist_menu
     set flist_menu .flistctxmenu
     makemenu $flist_menu {
-	{mc "Highlight this too" command {flist_hl 0}}
-	{mc "Highlight this only" command {flist_hl 1}}
-	{mc "External diff" command {external_diff}}
-	{mc "Blame parent commit" command {external_blame 1}}
-	{mc "Copy path" command {clipboard clear; clipboard append $flist_menu_file}}
+        {mc "Highlight this too" command {flist_hl 0}}
+        {mc "Highlight this only" command {flist_hl 1}}
+        {mc "External diff" command {external_diff}}
+        {mc "Blame parent commit" command {external_blame 1}}
+        {mc "Copy path" command {clipboard clear; clipboard append $flist_menu_file}}
     }
     $flist_menu configure -tearoff 0
 
     global diff_menu
     set diff_menu .diffctxmenu
     makemenu $diff_menu {
-	{mc "Show origin of this line" command show_line_source}
-	{mc "Run git gui blame on this line" command {external_blame_diff}}
+        {mc "Show origin of this line" command show_line_source}
+        {mc "Run git gui blame on this line" command {external_blame_diff}}
     }
     $diff_menu configure -tearoff 0
 }
@@ -2701,14 +2712,14 @@ proc windows_mousewheel_redirector {W X Y D} {
     global canv canv2 canv3
     set w [winfo containing -displayof $W $X $Y]
     if {$w ne ""} {
-	set u [expr {$D < 0 ? 5 : -5}]
-	if {$w == $canv || $w == $canv2 || $w == $canv3} {
-	    allcanvs yview scroll $u units
-	} else {
-	    catch {
-		$w yview scroll $u units
-	    }
-	}
+        set u [expr {$D < 0 ? 5 : -5}]
+        if {$w == $canv || $w == $canv2 || $w == $canv3} {
+            allcanvs yview scroll $u units
+        } else {
+            catch {
+                $w yview scroll $u units
+            }
+        }
     }
 }
 
@@ -2717,9 +2728,9 @@ proc selectedline_change {n1 n2 op} {
     global selectedline rownumsel
 
     if {$selectedline eq {}} {
-	set rownumsel {}
+        set rownumsel {}
     } else {
-	set rownumsel [expr {$selectedline + 1}]
+        set rownumsel [expr {$selectedline + 1}]
     }
 }
 
@@ -2728,11 +2739,11 @@ proc selectedline_change {n1 n2 op} {
 proc canvscan {op w x y} {
     global canv canv2 canv3
     foreach c [list $canv $canv2 $canv3] {
-	if {$c == $w} {
-	    $c scan $op $x $y
-	} else {
-	    $c scan $op 0 $y
-	}
+        if {$c == $w} {
+            $c scan $op $x $y
+        } else {
+            $c scan $op 0 $y
+        }
     }
 }
 
@@ -2750,10 +2761,10 @@ proc bindkey {ev script} {
     bind . $ev $script
     set escript [bind Entry $ev]
     if {$escript == {}} {
-	set escript [bind Entry <Key>]
+        set escript [bind Entry <Key>]
     }
     foreach e $entries {
-	bind $e $ev "$escript; break"
+        bind $e $ev "$escript; break"
     }
 }
 
@@ -2767,7 +2778,7 @@ proc bindmodfunctionkey {mod n script} {
 proc click {w} {
     global ctext entries
     foreach e [concat $entries $ctext] {
-	if {$w == $e} return
+        if {$w == $e} return
     }
     focus .
 }
@@ -2779,8 +2790,8 @@ proc adjustprogress {} {
     global rprogitem rprogcoord use_ttk
 
     if {$use_ttk} {
-	$progresscanv configure -value [expr {int($fprogcoord * 100)}]
-	return
+        $progresscanv configure -value [expr {int($fprogcoord * 100)}]
+        return
     }
 
     set w [expr {[winfo width $progresscanv] - 4}]
@@ -2792,11 +2803,11 @@ proc adjustprogress {} {
     $progresscanv coords $rprogitem 0 0 [expr {$w * $rprogcoord}] $h
     set now [clock clicks -milliseconds]
     if {$now >= $lastprogupdate + 100} {
-	set progupdatepending 0
-	update
+        set progupdatepending 0
+        update
     } elseif {!$progupdatepending} {
-	set progupdatepending 1
-	after [expr {$lastprogupdate + 100 - $now}] doprogupdate
+        set progupdatepending 1
+        after [expr {$lastprogupdate + 100 - $now}] doprogupdate
     }
 }
 
@@ -2804,9 +2815,9 @@ proc doprogupdate {} {
     global lastprogupdate progupdatepending
 
     if {$progupdatepending} {
-	set progupdatepending 0
-	set lastprogupdate [clock clicks -milliseconds]
-	update
+        set progupdatepending 0
+        set lastprogupdate [clock clicks -milliseconds]
+        update
     }
 }
 
@@ -2814,14 +2825,14 @@ proc config_check_tmp_exists {tries_left} {
     global config_file_tmp
 
     if {[file exists $config_file_tmp]} {
-	incr tries_left -1
-	if {$tries_left > 0} {
-	    after 100 [list config_check_tmp_exists $tries_left]
-	} else {
-	    error_popup "There appears to be a stale $config_file_tmp\
+        incr tries_left -1
+        if {$tries_left > 0} {
+            after 100 [list config_check_tmp_exists $tries_left]
+        } else {
+            error_popup "There appears to be a stale $config_file_tmp\
  file, which will prevent gitk from saving its configuration on exit.\
  Please remove it if it is not being used by any existing gitk process."
-	}
+        }
     }
 }
 
@@ -2838,9 +2849,9 @@ proc config_variable_change_cb {name name2 op} {
 
     upvar #0 $name var
     if {$op eq "write" &&
-	(![info exists config_variable_original($name)] ||
-	 $config_variable_original($name) ne $var)} {
-	set config_variable_changed($name) 1
+        (![info exists config_variable_original($name)] ||
+         $config_variable_original($name) ne $var)} {
+        set config_variable_changed($name) 1
     }
 }
 
@@ -2862,151 +2873,158 @@ proc savestuff {w} {
     if {![winfo viewable .]} return
     set remove_tmp 0
     if {[catch {
-	set try_count 0
-	while {[catch {set f [open $config_file_tmp {WRONLY CREAT EXCL}]}]} {
-	    if {[incr try_count] > 50} {
-		error "Unable to write config file: $config_file_tmp exists"
-	    }
-	    after 100
-	}
-	set remove_tmp 1
-	if {$::tcl_platform(platform) eq {windows}} {
-	    file attributes $config_file_tmp -hidden true
-	}
-	if {[file exists $config_file]} {
-	    source $config_file
-	}
-	foreach var_name $config_variables {
-	    upvar #0 $var_name var
-	    upvar 0 $var_name old_var
-	    if {!$config_variable_changed($var_name) && [info exists old_var]} {
-		puts $f [list set $var_name $old_var]
-	    } else {
-		puts $f [list set $var_name $var]
-	    }
-	}
+        set try_count 0
+        while {[catch {set f [open $config_file_tmp {WRONLY CREAT EXCL}]}]} {
+            if {[incr try_count] > 50} {
+                error "Unable to write config file: $config_file_tmp exists"
+            }
+            after 100
+        }
+        set remove_tmp 1
+        if {$::tcl_platform(platform) eq {windows}} {
+            file attributes $config_file_tmp -hidden true
+        }
+        if {[file exists $config_file]} {
+            source $config_file
+        }
+        foreach var_name $config_variables {
+            upvar #0 $var_name var
+            upvar 0 $var_name old_var
+            if {!$config_variable_changed($var_name) && [info exists old_var]} {
+                puts $f [list set $var_name $old_var]
+            } else {
+                puts $f [list set $var_name $var]
+            }
+        }
 
-	puts $f "set geometry(main) [wm geometry .]"
-	puts $f "set geometry(state) [wm state .]"
-	puts $f "set geometry(topwidth) [winfo width .tf]"
-	puts $f "set geometry(topheight) [winfo height .tf]"
-	if {$current_use_ttk} {
-	    puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sashpos 0] 1\""
-	    puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sashpos 1] 1\""
-	} else {
-	    puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sash coord 0]\""
-	    puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sash coord 1]\""
-	}
-	puts $f "set geometry(botwidth) [winfo width .bleft]"
-	puts $f "set geometry(botheight) [winfo height .bleft]"
+        puts $f "set geometry(main) [wm geometry .]"
+        puts $f "set geometry(state) [wm state .]"
+        puts $f "set geometry(topwidth) [winfo width .tf]"
+        puts $f "set geometry(topheight) [winfo height .tf]"
+        if {$current_use_ttk} {
+            puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sashpos 0] 1\""
+            puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sashpos 1] 1\""
+        } else {
+            puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sash coord 0]\""
+            puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sash coord 1]\""
+        }
+        puts $f "set geometry(botwidth) [winfo width .bleft]"
+        puts $f "set geometry(botheight) [winfo height .bleft]"
 
-	array set view_save {}
-	array set views {}
-	if {![info exists permviews]} { set permviews {} }
-	foreach view $permviews {
-	    set view_save([lindex $view 0]) 1
-	    set views([lindex $view 0]) $view
-	}
-	puts -nonewline $f "set permviews {"
-	for {set v 1} {$v < $current_nextviewnum} {incr v} {
-	    if {$viewchanged($v)} {
-		if {$current_viewperm($v)} {
-		    set views($current_viewname($v)) [list $current_viewname($v) $current_viewfiles($v) $current_viewargs($v) $current_viewargscmd($v)]
-		} else {
-		    set view_save($current_viewname($v)) 0
-		}
-	    }
-	}
-	# write old and updated view to their places and append remaining to the end
-	foreach view $permviews {
-	    set view_name [lindex $view 0]
-	    if {$view_save($view_name)} {
-		puts $f "{$views($view_name)}"
-	    }
-	    unset views($view_name)
-	}
-	foreach view_name [array names views] {
-	    puts $f "{$views($view_name)}"
-	}
-	puts $f "}"
-	close $f
-	file rename -force $config_file_tmp $config_file
-	set remove_tmp 0
+        array set view_save {}
+        array set views {}
+        if {![info exists permviews]} { set permviews {} }
+        foreach view $permviews {
+            set view_save([lindex $view 0]) 1
+            set views([lindex $view 0]) $view
+        }
+        puts -nonewline $f "set permviews {"
+        for {set v 1} {$v < $current_nextviewnum} {incr v} {
+            if {$viewchanged($v)} {
+                if {$current_viewperm($v)} {
+                    set views($current_viewname($v)) [list $current_viewname($v) $current_viewfiles($v) $current_viewargs($v) $current_viewargscmd($v)]
+                } else {
+                    set view_save($current_viewname($v)) 0
+                }
+            }
+        }
+        # write old and updated view to their places and append remaining to the end
+        foreach view $permviews {
+            set view_name [lindex $view 0]
+            if {$view_save($view_name)} {
+                puts $f "{$views($view_name)}"
+            }
+            unset views($view_name)
+        }
+        foreach view_name [array names views] {
+            puts $f "{$views($view_name)}"
+        }
+        puts $f "}"
+        close $f
+        file rename -force $config_file_tmp $config_file
+        set remove_tmp 0
     } err]} {
         puts "Error saving config: $err"
     }
     if {$remove_tmp} {
-	file delete -force $config_file_tmp
+        file delete -force $config_file_tmp
     }
     set stuffsaved 1
 }
 
 proc resizeclistpanes {win w} {
-    global oldwidth use_ttk
+    global oldwidth oldsash use_ttk
     if {[info exists oldwidth($win)]} {
-	if {$use_ttk} {
-	    set s0 [$win sashpos 0]
-	    set s1 [$win sashpos 1]
-	} else {
-	    set s0 [$win sash coord 0]
-	    set s1 [$win sash coord 1]
-	}
-	if {$w < 60} {
-	    set sash0 [expr {int($w/2 - 2)}]
-	    set sash1 [expr {int($w*5/6 - 2)}]
-	} else {
-	    set factor [expr {1.0 * $w / $oldwidth($win)}]
-	    set sash0 [expr {int($factor * [lindex $s0 0])}]
-	    set sash1 [expr {int($factor * [lindex $s1 0])}]
-	    if {$sash0 < 30} {
-		set sash0 30
-	    }
-	    if {$sash1 < $sash0 + 20} {
-		set sash1 [expr {$sash0 + 20}]
-	    }
-	    if {$sash1 > $w - 10} {
-		set sash1 [expr {$w - 10}]
-		if {$sash0 > $sash1 - 20} {
-		    set sash0 [expr {$sash1 - 20}]
-		}
-	    }
-	}
-	if {$use_ttk} {
-	    $win sashpos 0 $sash0
-	    $win sashpos 1 $sash1
-	} else {
-	    $win sash place 0 $sash0 [lindex $s0 1]
-	    $win sash place 1 $sash1 [lindex $s1 1]
-	}
+	if {[info exists oldsash($win)]} {
+	    set s0 [lindex $oldsash($win) 0]
+	    set s1 [lindex $oldsash($win) 1]
+        } elseif {$use_ttk} {
+            set s0 [$win sashpos 0]
+            set s1 [$win sashpos 1]
+        } else {
+            set s0 [$win sash coord 0]
+            set s1 [$win sash coord 1]
+        }
+        if {$w < 60} {
+            set sash0 [expr {int($w/2 - 2)}]
+            set sash1 [expr {int($w*5/6 - 2)}]
+        } else {
+            set factor [expr {1.0 * $w / $oldwidth($win)}]
+            set sash0 [expr {int($factor * [lindex $s0 0])}]
+            set sash1 [expr {int($factor * [lindex $s1 0])}]
+            if {$sash0 < 30} {
+                set sash0 30
+            }
+            if {$sash1 < $sash0 + 20} {
+                set sash1 [expr {$sash0 + 20}]
+            }
+            if {$sash1 > $w - 10} {
+                set sash1 [expr {$w - 10}]
+                if {$sash0 > $sash1 - 20} {
+                    set sash0 [expr {$sash1 - 20}]
+                }
+            }
+        }
+        if {$use_ttk} {
+            $win sashpos 0 $sash0
+            $win sashpos 1 $sash1
+        } else {
+            $win sash place 0 $sash0 [lindex $s0 1]
+            $win sash place 1 $sash1 [lindex $s1 1]
+        }
+	set oldsash($win) [list $sash0 $sash1]
     }
     set oldwidth($win) $w
 }
 
 proc resizecdetpanes {win w} {
-    global oldwidth use_ttk
+    global oldwidth oldsash use_ttk
     if {[info exists oldwidth($win)]} {
-	if {$use_ttk} {
-	    set s0 [$win sashpos 0]
-	} else {
-	    set s0 [$win sash coord 0]
-	}
-	if {$w < 60} {
-	    set sash0 [expr {int($w*3/4 - 2)}]
-	} else {
-	    set factor [expr {1.0 * $w / $oldwidth($win)}]
-	    set sash0 [expr {int($factor * [lindex $s0 0])}]
-	    if {$sash0 < 45} {
-		set sash0 45
-	    }
-	    if {$sash0 > $w - 15} {
-		set sash0 [expr {$w - 15}]
-	    }
-	}
-	if {$use_ttk} {
-	    $win sashpos 0 $sash0
-	} else {
-	    $win sash place 0 $sash0 [lindex $s0 1]
-	}
+	if {[info exists oldsash($win)]} {
+	    set s0 $oldsash($win)
+        } elseif {$use_ttk} {
+            set s0 [$win sashpos 0]
+        } else {
+            set s0 [$win sash coord 0]
+        }
+        if {$w < 60} {
+            set sash0 [expr {int($w*3/4 - 2)}]
+        } else {
+            set factor [expr {1.0 * $w / $oldwidth($win)}]
+            set sash0 [expr {int($factor * [lindex $s0 0])}]
+            if {$sash0 < 45} {
+                set sash0 45
+            }
+            if {$sash0 > $w - 15} {
+                set sash0 [expr {$w - 15}]
+            }
+        }
+        if {$use_ttk} {
+            $win sashpos 0 $sash0
+        } else {
+            $win sash place 0 $sash0 [lindex $s0 1]
+        }
+	set oldsash($win) $sash0
     }
     set oldwidth($win) $w
 }
@@ -3029,8 +3047,8 @@ proc about {} {
     global bgcolor NS
     set w .about
     if {[winfo exists $w]} {
-	raise $w
-	return
+        raise $w
+        return
     }
     ttk_toplevel $w
     wm title $w [mc "About gitk"]
@@ -3041,7 +3059,7 @@ Gitk - a commit viewer for git
 Copyright \u00a9 2005-2016 Paul Mackerras
 
 Use and redistribute under the terms of the GNU General Public License"] \
-	    -justify center -aspect 400 -border 2 -bg $bgcolor -relief groove
+            -justify center -aspect 400 -border 2 -bg $bgcolor -relief groove
     pack $w.m -side top -fill x -padx 2 -pady 2
     ${NS}::button $w.ok -text [mc "Close"] -command "destroy $w" -default active
     pack $w.ok -side bottom
@@ -3055,13 +3073,13 @@ proc keys {} {
     global bgcolor NS
     set w .keys
     if {[winfo exists $w]} {
-	raise $w
-	return
+        raise $w
+        return
     }
     if {[tk windowingsystem] eq {aqua}} {
-	set M1T Cmd
+        set M1T Cmd
     } else {
-	set M1T Ctrl
+        set M1T Ctrl
     }
     ttk_toplevel $w
     wm title $w [mc "Gitk key bindings"]
@@ -3108,7 +3126,7 @@ proc keys {} {
 [mc "<%s-minus>	Decrease font size" $M1T]
 [mc "<F5>		Update"]
 " \
-	    -justify left -bg $bgcolor -border 2 -relief groove
+            -justify left -bg $bgcolor -border 2 -relief groove
     pack $w.m -side top -fill both -padx 2 -pady 2
     ${NS}::button $w.ok -text [mc "Close"] -command "destroy $w" -default active
     bind $w <Key-Escape> [list destroy $w]
@@ -3135,68 +3153,68 @@ proc treeview {w l openlevs} {
     set treecontents() {}
     $w conf -state normal
     foreach f $l {
-	while {[string range $f 0 $prefixend] ne $prefix} {
-	    if {$lev <= $openlevs} {
-		$w mark set e:$treeindex($prefix) "end -1c"
-		$w mark gravity e:$treeindex($prefix) left
-	    }
-	    set treeheight($prefix) $ht
-	    incr ht [lindex $htstack end]
-	    set htstack [lreplace $htstack end end]
-	    set prefixend [lindex $prefendstack end]
-	    set prefendstack [lreplace $prefendstack end end]
-	    set prefix [string range $prefix 0 $prefixend]
-	    incr lev -1
-	}
-	set tail [string range $f [expr {$prefixend+1}] end]
-	while {[set slash [string first "/" $tail]] >= 0} {
-	    lappend htstack $ht
-	    set ht 0
-	    lappend prefendstack $prefixend
-	    incr prefixend [expr {$slash + 1}]
-	    set d [string range $tail 0 $slash]
-	    lappend treecontents($prefix) $d
-	    set oldprefix $prefix
-	    append prefix $d
-	    set treecontents($prefix) {}
-	    set treeindex($prefix) [incr ix]
-	    set treeparent($prefix) $oldprefix
-	    set tail [string range $tail [expr {$slash+1}] end]
-	    if {$lev <= $openlevs} {
-		set ht 1
-		set treediropen($prefix) [expr {$lev < $openlevs}]
-		set bm [expr {$lev == $openlevs? "tri-rt": "tri-dn"}]
-		$w mark set d:$ix "end -1c"
-		$w mark gravity d:$ix left
-		set str "\n"
-		for {set i 0} {$i < $lev} {incr i} {append str "\t"}
-		$w insert end $str
-		$w image create end -align center -image $bm -padx 1 \
-		    -name a:$ix
-		$w insert end $d [highlight_tag $prefix]
-		$w mark set s:$ix "end -1c"
-		$w mark gravity s:$ix left
-	    }
-	    incr lev
-	}
-	if {$tail ne {}} {
-	    if {$lev <= $openlevs} {
-		incr ht
-		set str "\n"
-		for {set i 0} {$i < $lev} {incr i} {append str "\t"}
-		$w insert end $str
-		$w insert end $tail [highlight_tag $f]
-	    }
-	    lappend treecontents($prefix) $tail
-	}
+        while {[string range $f 0 $prefixend] ne $prefix} {
+            if {$lev <= $openlevs} {
+                $w mark set e:$treeindex($prefix) "end -1c"
+                $w mark gravity e:$treeindex($prefix) left
+            }
+            set treeheight($prefix) $ht
+            incr ht [lindex $htstack end]
+            set htstack [lreplace $htstack end end]
+            set prefixend [lindex $prefendstack end]
+            set prefendstack [lreplace $prefendstack end end]
+            set prefix [string range $prefix 0 $prefixend]
+            incr lev -1
+        }
+        set tail [string range $f [expr {$prefixend+1}] end]
+        while {[set slash [string first "/" $tail]] >= 0} {
+            lappend htstack $ht
+            set ht 0
+            lappend prefendstack $prefixend
+            incr prefixend [expr {$slash + 1}]
+            set d [string range $tail 0 $slash]
+            lappend treecontents($prefix) $d
+            set oldprefix $prefix
+            append prefix $d
+            set treecontents($prefix) {}
+            set treeindex($prefix) [incr ix]
+            set treeparent($prefix) $oldprefix
+            set tail [string range $tail [expr {$slash+1}] end]
+            if {$lev <= $openlevs} {
+                set ht 1
+                set treediropen($prefix) [expr {$lev < $openlevs}]
+                set bm [expr {$lev == $openlevs? "tri-rt": "tri-dn"}]
+                $w mark set d:$ix "end -1c"
+                $w mark gravity d:$ix left
+                set str "\n"
+                for {set i 0} {$i < $lev} {incr i} {append str "\t"}
+                $w insert end $str
+                $w image create end -align center -image $bm -padx 1 \
+                    -name a:$ix
+                $w insert end $d [highlight_tag $prefix]
+                $w mark set s:$ix "end -1c"
+                $w mark gravity s:$ix left
+            }
+            incr lev
+        }
+        if {$tail ne {}} {
+            if {$lev <= $openlevs} {
+                incr ht
+                set str "\n"
+                for {set i 0} {$i < $lev} {incr i} {append str "\t"}
+                $w insert end $str
+                $w insert end $tail [highlight_tag $f]
+            }
+            lappend treecontents($prefix) $tail
+        }
     }
     while {$htstack ne {}} {
-	set treeheight($prefix) $ht
-	incr ht [lindex $htstack end]
-	set htstack [lreplace $htstack end end]
-	set prefixend [lindex $prefendstack end]
-	set prefendstack [lreplace $prefendstack end end]
-	set prefix [string range $prefix 0 $prefixend]
+        set treeheight($prefix) $ht
+        incr ht [lindex $htstack end]
+        set htstack [lreplace $htstack end end]
+        set prefixend [lindex $prefendstack end]
+        set prefendstack [lreplace $prefendstack end end]
+        set prefix [string range $prefix 0 $prefixend]
     }
     $w conf -state disabled
 }
@@ -3207,21 +3225,21 @@ proc linetoelt {l} {
     set y 2
     set prefix {}
     while {1} {
-	foreach e $treecontents($prefix) {
-	    if {$y == $l} {
-		return "$prefix$e"
-	    }
-	    set n 1
-	    if {[string index $e end] eq "/"} {
-		set n $treeheight($prefix$e)
-		if {$y + $n > $l} {
-		    append prefix $e
-		    incr y
-		    break
-		}
-	    }
-	    incr y $n
-	}
+        foreach e $treecontents($prefix) {
+            if {$y == $l} {
+                return "$prefix$e"
+            }
+            set n 1
+            if {[string index $e end] eq "/"} {
+                set n $treeheight($prefix$e)
+                if {$y + $n > $l} {
+                    append prefix $e
+                    incr y
+                    break
+                }
+            }
+            incr y $n
+        }
     }
 }
 
@@ -3229,14 +3247,14 @@ proc highlight_tree {y prefix} {
     global treeheight treecontents cflist
 
     foreach e $treecontents($prefix) {
-	set path $prefix$e
-	if {[highlight_tag $path] ne {}} {
-	    $cflist tag add bold $y.0 "$y.0 lineend"
-	}
-	incr y
-	if {[string index $e end] eq "/" && $treeheight($path) > 1} {
-	    set y [highlight_tree $y $path]
-	}
+        set path $prefix$e
+        if {[highlight_tag $path] ne {}} {
+            $cflist tag add bold $y.0 "$y.0 lineend"
+        }
+        incr y
+        if {[string index $e end] eq "/" && $treeheight($path) > 1} {
+            set y [highlight_tree $y $path]
+        }
     }
     return $y
 }
@@ -3252,8 +3270,8 @@ proc treeclosedir {w dir} {
     $w conf -state disabled
     set n [expr {1 - $treeheight($dir)}]
     while {$dir ne {}} {
-	incr treeheight($dir) $n
-	set dir $treeparent($dir)
+        incr treeheight($dir) $n
+        set dir $treeparent($dir)
     }
 }
 
@@ -3269,28 +3287,28 @@ proc treeopendir {w dir} {
     set str "\n"
     set n [llength $treecontents($dir)]
     for {set x $dir} {$x ne {}} {set x $treeparent($x)} {
-	incr lev
-	append str "\t"
-	incr treeheight($x) $n
+        incr lev
+        append str "\t"
+        incr treeheight($x) $n
     }
     foreach e $treecontents($dir) {
-	set de $dir$e
-	if {[string index $e end] eq "/"} {
-	    set iy $treeindex($de)
-	    $w mark set d:$iy e:$ix
-	    $w mark gravity d:$iy left
-	    $w insert e:$ix $str
-	    set treediropen($de) 0
-	    $w image create e:$ix -align center -image tri-rt -padx 1 \
-		-name a:$iy
-	    $w insert e:$ix $e [highlight_tag $de]
-	    $w mark set s:$iy e:$ix
-	    $w mark gravity s:$iy left
-	    set treeheight($de) 1
-	} else {
-	    $w insert e:$ix $str
-	    $w insert e:$ix $e [highlight_tag $de]
-	}
+        set de $dir$e
+        if {[string index $e end] eq "/"} {
+            set iy $treeindex($de)
+            $w mark set d:$iy e:$ix
+            $w mark gravity d:$iy left
+            $w insert e:$ix $str
+            set treediropen($de) 0
+            $w image create e:$ix -align center -image tri-rt -padx 1 \
+                -name a:$iy
+            $w insert e:$ix $e [highlight_tag $de]
+            $w mark set s:$iy e:$ix
+            $w mark gravity s:$iy left
+            set treeheight($de) 1
+        } else {
+            $w insert e:$ix $str
+            $w insert e:$ix $e [highlight_tag $de]
+        }
     }
     $w mark gravity e:$ix right
     $w conf -state disabled
@@ -3299,13 +3317,13 @@ proc treeopendir {w dir} {
     set ht [$w cget -height]
     set l [lindex [split [$w index s:$ix] .] 0]
     if {$l < $top} {
-	$w yview $l.0
+        $w yview $l.0
     } elseif {$l + $n + 1 > $top + $ht} {
-	set top [expr {$l + $n + 2 - $ht}]
-	if {$l < $top} {
-	    set top $l
-	}
-	$w yview $top.0
+        set top [expr {$l + $n + 2 - $ht}]
+        if {$l < $top} {
+            set top $l
+        }
+        $w yview $top.0
     }
 }
 
@@ -3319,16 +3337,16 @@ proc treeclick {w x y} {
     $cflist tag add highlight $l.0 "$l.0 lineend"
     set cflist_top $l
     if {$l == 1} {
-	$ctext yview 1.0
-	return
+        $ctext yview 1.0
+        return
     }
     set e [linetoelt $l]
     if {[string index $e end] ne "/"} {
-	showfile $e
+        showfile $e
     } elseif {$treediropen($e)} {
-	treeclosedir $w $e
+        treeclosedir $w $e
     } else {
-	treeopendir $w $e
+        treeopendir $w $e
     }
 }
 
@@ -3337,10 +3355,10 @@ proc setfilelist {id} {
 
     treeview $cflist $treefilelist($id) 0
     if {$jump_to_here ne {}} {
-	set f [lindex $jump_to_here 0]
-	if {[lsearch -exact $treefilelist($id) $f] >= 0} {
-	    showfile $f
-	}
+        set f [lindex $jump_to_here 0]
+        if {[lsearch -exact $treefilelist($id) $f] >= 0} {
+            showfile $f
+        }
     }
 }
 
@@ -3415,11 +3433,11 @@ proc init_flist {first} {
     $cflist conf -state normal
     $cflist delete 0.0 end
     if {$first ne {}} {
-	$cflist insert end $first
-	set cflist_top 1
-	$cflist tag add highlight 1.0 "1.0 lineend"
+        $cflist insert end $first
+        set cflist_top 1
+        $cflist tag add highlight 1.0 "1.0 lineend"
     } else {
-	unset -nocomplain cflist_top
+        unset -nocomplain cflist_top
     }
     $cflist conf -state disabled
     set difffilestart {}
@@ -3429,9 +3447,9 @@ proc highlight_tag {f} {
     global highlight_paths
 
     foreach p $highlight_paths {
-	if {[string match $p $f]} {
-	    return "bold"
-	}
+        if {[string match $p $f]} {
+            return "bold"
+        }
     }
     return {}
 }
@@ -3441,15 +3459,15 @@ proc highlight_filelist {} {
 
     $cflist conf -state normal
     if {$cmitmode ne "tree"} {
-	set end [lindex [split [$cflist index end] .] 0]
-	for {set l 2} {$l < $end} {incr l} {
-	    set line [$cflist get $l.0 "$l.0 lineend"]
-	    if {[highlight_tag $line] ne {}} {
-		$cflist tag add bold $l.0 "$l.0 lineend"
-	    }
-	}
+        set end [lindex [split [$cflist index end] .] 0]
+        for {set l 2} {$l < $end} {incr l} {
+            set line [$cflist get $l.0 "$l.0 lineend"]
+            if {[highlight_tag $line] ne {}} {
+                $cflist tag add bold $l.0 "$l.0 lineend"
+            }
+        }
     } else {
-	highlight_tree 2 {}
+        highlight_tree 2 {}
     }
     $cflist conf -state disabled
 }
@@ -3467,8 +3485,8 @@ proc add_flist {fl} {
 
     $cflist conf -state normal
     foreach f $fl {
-	$cflist insert end "\n"
-	$cflist insert end $f [highlight_tag $f]
+        $cflist insert end "\n"
+        $cflist insert end $f [highlight_tag $f]
     }
     $cflist conf -state disabled
 }
@@ -3483,9 +3501,9 @@ proc sel_flist {w x y} {
     $cflist tag add highlight $l.0 "$l.0 lineend"
     set cflist_top $l
     if {$l == 1} {
-	$ctext yview 1.0
+        $ctext yview 1.0
     } else {
-	catch {$ctext yview [lindex $difffilestart [expr {$l - 2}]]}
+        catch {$ctext yview [lindex $difffilestart [expr {$l - 2}]]}
     }
     suppress_highlighting_file_for_current_scrollpos
 }
@@ -3498,15 +3516,15 @@ proc pop_flist_menu {w X Y x y} {
     set l [lindex [split [$w index "@$x,$y"] "."] 0]
     if {$l <= 1} return
     if {$cmitmode eq "tree"} {
-	set e [linetoelt $l]
-	if {[string index $e end] eq "/"} return
+        set e [linetoelt $l]
+        if {[string index $e end] eq "/"} return
     } else {
-	set e [lindex $treediffs($diffids) [expr {$l-2}]]
+        set e [lindex $treediffs($diffids) [expr {$l-2}]]
     }
     set flist_menu_file $e
     set xdiffstate "normal"
     if {$cmitmode eq "tree"} {
-	set xdiffstate "disabled"
+        set xdiffstate "disabled"
     }
     # Disable "External diff" item in tree mode
     $flist_menu entryconf 2 -state $xdiffstate
@@ -3535,7 +3553,7 @@ proc pop_diff_menu {w X Y x y} {
     set diff_menu_line [lindex $diff_menu_txtpos 0]
     # don't pop up the menu on hunk-separator or file-separator lines
     if {[lsearch -glob [$ctext tag names $diff_menu_line.0] "*sep"] >= 0} {
-	return
+        return
     }
     stopfinding
     set f [find_ctext_fileinfo $diff_menu_line]
@@ -3550,9 +3568,9 @@ proc flist_hl {only} {
 
     set x [shellquote $flist_menu_file]
     if {$only || $findstring eq {} || $gdttype ne [mc "touching paths:"]} {
-	set findstring $x
+        set findstring $x
     } else {
-	append findstring " " $x
+        append findstring " " $x
     }
     set gdttype [mc "touching paths:"]
 }
@@ -3561,29 +3579,29 @@ proc gitknewtmpdir {} {
     global diffnum gitktmpdir gitdir env
 
     if {![info exists gitktmpdir]} {
-	if {[info exists env(GITK_TMPDIR)]} {
-	    set tmpdir $env(GITK_TMPDIR)
-	} elseif {[info exists env(TMPDIR)]} {
-	    set tmpdir $env(TMPDIR)
-	} else {
-	    set tmpdir $gitdir
-	}
-	set gitktmpformat [file join $tmpdir ".gitk-tmp.XXXXXX"]
-	if {[catch {set gitktmpdir [exec mktemp -d $gitktmpformat]}]} {
-	    set gitktmpdir [file join $gitdir [format ".gitk-tmp.%s" [pid]]]
-	}
-	if {[catch {file mkdir $gitktmpdir} err]} {
-	    error_popup "[mc "Error creating temporary directory %s:" $gitktmpdir] $err"
-	    unset gitktmpdir
-	    return {}
-	}
-	set diffnum 0
+        if {[info exists env(GITK_TMPDIR)]} {
+            set tmpdir $env(GITK_TMPDIR)
+        } elseif {[info exists env(TMPDIR)]} {
+            set tmpdir $env(TMPDIR)
+        } else {
+            set tmpdir $gitdir
+        }
+        set gitktmpformat [file join $tmpdir ".gitk-tmp.XXXXXX"]
+        if {[catch {set gitktmpdir [exec mktemp -d $gitktmpformat]}]} {
+            set gitktmpdir [file join $gitdir [format ".gitk-tmp.%s" [pid]]]
+        }
+        if {[catch {file mkdir $gitktmpdir} err]} {
+            error_popup "[mc "Error creating temporary directory %s:" $gitktmpdir] $err"
+            unset gitktmpdir
+            return {}
+        }
+        set diffnum 0
     }
     incr diffnum
     set diffdir [file join $gitktmpdir $diffnum]
     if {[catch {file mkdir $diffdir} err]} {
-	error_popup "[mc "Error creating temporary directory %s:" $diffdir] $err"
-	return {}
+        error_popup "[mc "Error creating temporary directory %s:" $diffdir] $err"
+        return {}
     }
     return $diffdir
 }
@@ -3592,11 +3610,11 @@ proc save_file_from_commit {filename output what} {
     global nullfile
 
     if {[catch {exec git show $filename -- > $output} err]} {
-	if {[string match "fatal: bad revision *" $err]} {
-	    return $nullfile
-	}
-	error_popup "[mc "Error getting \"%s\" from %s:" $filename $what] $err"
-	return {}
+        if {[string match "fatal: bad revision *" $err]} {
+            return $nullfile
+        }
+        error_popup "[mc "Error getting \"%s\" from %s:" $filename $what] $err"
+        return {}
     }
     return $output
 }
@@ -3607,10 +3625,10 @@ proc external_diff_get_one_file {diffid filename diffdir} {
 
     if {$diffid == $nullid} {
         set difffile [file join $worktree $filename]
-	if {[file exists $difffile]} {
-	    return $difffile
-	}
-	return $nullfile
+        if {[file exists $difffile]} {
+            return $difffile
+        }
+        return $nullfile
     }
     if {$diffid == $nullid2} {
         set difffile [file join $diffdir "\[index\] [file tail $filename]"]
@@ -3618,7 +3636,7 @@ proc external_diff_get_one_file {diffid filename diffdir} {
     }
     set difffile [file join $diffdir "\[$diffid\] [file tail $filename]"]
     return [save_file_from_commit $diffid:$filename $difffile \
-	       "revision $diffid"]
+               "revision $diffid"]
 }
 
 proc external_diff {} {
@@ -3675,18 +3693,18 @@ proc find_hunk_blamespec {base line} {
 
     set s_line [$ctext get $s_lix "$s_lix + 1 lines"]
     if {![regexp {^@@@*(( -\d+(,\d+)?)+) \+(\d+)(,\d+)? @@} $s_line \
-	    s_line old_specs osz osz1 new_line nsz]} {
-	return
+            s_line old_specs osz osz1 new_line nsz]} {
+        return
     }
 
     # base lines for the parents
     set base_lines [list $new_line]
     foreach old_spec [lrange [split $old_specs " "] 1 end] {
-	if {![regexp -- {-(\d+)(,\d+)?} $old_spec \
-	        old_spec old_line osz]} {
-	    return
-	}
-	lappend base_lines $old_line
+        if {![regexp -- {-(\d+)(,\d+)?} $old_spec \
+                old_spec old_line osz]} {
+            return
+        }
+        lappend base_lines $old_line
     }
 
     # Now scan the lines to determine offset within the hunk
@@ -3697,38 +3715,38 @@ proc find_hunk_blamespec {base line} {
     # Determine if the line is removed
     set chunk [$ctext get $line.0 "$line.1 + $max_parent chars"]
     if {[string match {[-+ ]*} $chunk]} {
-	set removed_idx [string first "-" $chunk]
-	# Choose a parent index
-	if {$removed_idx >= 0} {
-	    set parent $removed_idx
-	} else {
-	    set unchanged_idx [string first " " $chunk]
-	    if {$unchanged_idx >= 0} {
-		set parent $unchanged_idx
-	    } else {
-		# blame the current commit
-		set parent -1
-	    }
-	}
-	# then count other lines that belong to it
-	for {set i $line} {[incr i -1] > $s_lno} {} {
-	    set chunk [$ctext get $i.0 "$i.1 + $max_parent chars"]
-	    # Determine if the line is removed
-	    set removed_idx [string first "-" $chunk]
-	    if {$parent >= 0} {
-		set code [string index $chunk $parent]
-		if {$code eq "-" || ($removed_idx < 0 && $code ne "+")} {
-		    incr dline
-		}
-	    } else {
-		if {$removed_idx < 0} {
-		    incr dline
-		}
-	    }
-	}
-	incr parent
+        set removed_idx [string first "-" $chunk]
+        # Choose a parent index
+        if {$removed_idx >= 0} {
+            set parent $removed_idx
+        } else {
+            set unchanged_idx [string first " " $chunk]
+            if {$unchanged_idx >= 0} {
+                set parent $unchanged_idx
+            } else {
+                # blame the current commit
+                set parent -1
+            }
+        }
+        # then count other lines that belong to it
+        for {set i $line} {[incr i -1] > $s_lno} {} {
+            set chunk [$ctext get $i.0 "$i.1 + $max_parent chars"]
+            # Determine if the line is removed
+            set removed_idx [string first "-" $chunk]
+            if {$parent >= 0} {
+                set code [string index $chunk $parent]
+                if {$code eq "-" || ($removed_idx < 0 && $code ne "+")} {
+                    incr dline
+                }
+            } else {
+                if {$removed_idx < 0} {
+                    incr dline
+                }
+            }
+        }
+        incr parent
     } else {
-	set parent 0
+        set parent 0
     }
 
     incr dline [lindex $base_lines $parent]
@@ -3741,17 +3759,17 @@ proc external_blame_diff {} {
     global diff_menu_filebase flist_menu_file
 
     if {$cmitmode eq "tree"} {
-	set parent_idx 0
-	set line [expr {$diff_menu_line - $diff_menu_filebase}]
+        set parent_idx 0
+        set line [expr {$diff_menu_line - $diff_menu_filebase}]
     } else {
-	set hinfo [find_hunk_blamespec $diff_menu_filebase $diff_menu_line]
-	if {$hinfo ne {}} {
-	    set parent_idx [lindex $hinfo 0]
-	    set line [lindex $hinfo 1]
-	} else {
-	    set parent_idx 0
-	    set line 0
-	}
+        set hinfo [find_hunk_blamespec $diff_menu_filebase $diff_menu_line]
+        if {$hinfo ne {}} {
+            set parent_idx [lindex $hinfo 0]
+            set line [lindex $hinfo 1]
+        } else {
+            set parent_idx 0
+            set line 0
+        }
     }
 
     external_blame $parent_idx $line
@@ -3762,12 +3780,12 @@ proc external_blame_diff {} {
 proc index_sha1 {fname} {
     set f [open [list | git ls-files -s $fname] r]
     while {[gets $f line] >= 0} {
-	set info [lindex [split $line "\t"] 0]
-	set stage [lindex $info 2]
-	if {$stage eq "0" || $stage eq "2"} {
-	    close $f
-	    return [lindex $info 1]
-	}
+        set info [lindex [split $line "\t"] 0]
+        set stage [lindex $info 2]
+        if {$stage eq "0" || $stage eq "2"} {
+            close $f
+            return [lindex $info 1]
+        }
     }
     close $f
     return {}
@@ -3776,7 +3794,7 @@ proc index_sha1 {fname} {
 # Turn an absolute path into one relative to the current directory
 proc make_relative {f} {
     if {[file pathtype $f] eq "relative"} {
-	return $f
+        return $f
     }
     set elts [file split $f]
     set here [file split [pwd]]
@@ -3784,12 +3802,12 @@ proc make_relative {f} {
     set hi 0
     set res {}
     foreach d $here {
-	if {$ei < $hi || $ei >= [llength $elts] || [lindex $elts $ei] ne $d} {
-	    lappend res ".."
-	} else {
-	    incr ei
-	}
-	incr hi
+        if {$ei < $hi || $ei >= [llength $elts] || [lindex $elts $ei] ne $d} {
+            lappend res ".."
+        } else {
+            incr ei
+        }
+        incr hi
     }
     set elts [concat $res [lrange $elts $ei end]]
     return [eval file join $elts]
@@ -3801,19 +3819,19 @@ proc external_blame {parent_idx {line {}}} {
     global parentlist selectedline currentid
 
     if {$parent_idx > 0} {
-	set base_commit [lindex $parentlist $selectedline [expr {$parent_idx-1}]]
+        set base_commit [lindex $parentlist $selectedline [expr {$parent_idx-1}]]
     } else {
-	set base_commit $currentid
+        set base_commit $currentid
     }
 
     if {$base_commit eq {} || $base_commit eq $nullid || $base_commit eq $nullid2} {
-	error_popup [mc "No such commit"]
-	return
+        error_popup [mc "No such commit"]
+        return
     }
 
     set cmdline [list git gui blame]
     if {$line ne {} && $line > 1} {
-	lappend cmdline "--line=$line"
+        lappend cmdline "--line=$line"
     }
     set f [file join $cdup $flist_menu_file]
     # Unfortunately it seems git gui blame doesn't like
@@ -3821,7 +3839,7 @@ proc external_blame {parent_idx {line {}}} {
     set f [make_relative $f]
     lappend cmdline $base_commit $f
     if {[catch {eval exec $cmdline &} err]} {
-	error_popup "[mc "git gui blame: command failed:"] $err"
+        error_popup "[mc "git gui blame: command failed:"] $err"
     }
 }
 
@@ -3832,61 +3850,61 @@ proc show_line_source {} {
 
     set from_index {}
     if {$cmitmode eq "tree"} {
-	set id $currentid
-	set line [expr {$diff_menu_line - $diff_menu_filebase}]
+        set id $currentid
+        set line [expr {$diff_menu_line - $diff_menu_filebase}]
     } else {
-	set h [find_hunk_blamespec $diff_menu_filebase $diff_menu_line]
-	if {$h eq {}} return
-	set pi [lindex $h 0]
-	if {$pi == 0} {
-	    mark_ctext_line $diff_menu_line
-	    return
-	}
-	incr pi -1
-	if {$currentid eq $nullid} {
-	    if {$pi > 0} {
-		# must be a merge in progress...
-		if {[catch {
-		    # get the last line from .git/MERGE_HEAD
-		    set f [open [file join $gitdir MERGE_HEAD] r]
-		    set id [lindex [split [read $f] "\n"] end-1]
-		    close $f
-		} err]} {
-		    error_popup [mc "Couldn't read merge head: %s" $err]
-		    return
-		}
-	    } elseif {$parents($curview,$currentid) eq $nullid2} {
-		# need to do the blame from the index
-		if {[catch {
-		    set from_index [index_sha1 $flist_menu_file]
-		} err]} {
-		    error_popup [mc "Error reading index: %s" $err]
-		    return
-		}
-	    } else {
-		set id $parents($curview,$currentid)
-	    }
-	} else {
-	    set id [lindex $parents($curview,$currentid) $pi]
-	}
-	set line [lindex $h 1]
+        set h [find_hunk_blamespec $diff_menu_filebase $diff_menu_line]
+        if {$h eq {}} return
+        set pi [lindex $h 0]
+        if {$pi == 0} {
+            mark_ctext_line $diff_menu_line
+            return
+        }
+        incr pi -1
+        if {$currentid eq $nullid} {
+            if {$pi > 0} {
+                # must be a merge in progress...
+                if {[catch {
+                    # get the last line from .git/MERGE_HEAD
+                    set f [open [file join $gitdir MERGE_HEAD] r]
+                    set id [lindex [split [read $f] "\n"] end-1]
+                    close $f
+                } err]} {
+                    error_popup [mc "Couldn't read merge head: %s" $err]
+                    return
+                }
+            } elseif {$parents($curview,$currentid) eq $nullid2} {
+                # need to do the blame from the index
+                if {[catch {
+                    set from_index [index_sha1 $flist_menu_file]
+                } err]} {
+                    error_popup [mc "Error reading index: %s" $err]
+                    return
+                }
+            } else {
+                set id $parents($curview,$currentid)
+            }
+        } else {
+            set id [lindex $parents($curview,$currentid) $pi]
+        }
+        set line [lindex $h 1]
     }
     set blameargs {}
     if {$from_index ne {}} {
-	lappend blameargs | git cat-file blob $from_index
+        lappend blameargs | git cat-file blob $from_index
     }
     lappend blameargs | git blame -p -L$line,+1
     if {$from_index ne {}} {
-	lappend blameargs --contents -
+        lappend blameargs --contents -
     } else {
-	lappend blameargs $id
+        lappend blameargs $id
     }
     lappend blameargs -- [file join $cdup $flist_menu_file]
     if {[catch {
-	set f [open $blameargs r]
+        set f [open $blameargs r]
     } err]} {
-	error_popup [mc "Couldn't start git blame: %s" $err]
-	return
+        error_popup [mc "Couldn't start git blame: %s" $err]
+        return
     }
     nowbusy blaming [mc "Searching"]
     fconfigure $f -blocking 0
@@ -3900,9 +3918,9 @@ proc stopblaming {} {
     global blameinst
 
     if {[info exists blameinst]} {
-	stop_instance $blameinst
-	unset blameinst
-	notbusy blaming
+        stop_instance $blameinst
+        unset blameinst
+        notbusy blaming
     }
 }
 
@@ -3910,18 +3928,18 @@ proc read_line_source {fd inst} {
     global blamestuff curview commfd blameinst nullid nullid2
 
     while {[gets $fd line] >= 0} {
-	lappend blamestuff($inst) $line
+        lappend blamestuff($inst) $line
     }
     if {![eof $fd]} {
-	return 1
+        return 1
     }
     unset commfd($inst)
     unset blameinst
     notbusy blaming
     fconfigure $fd -blocking 1
     if {[catch {close $fd} err]} {
-	error_popup [mc "Error running git blame: %s" $err]
-	return 0
+        error_popup [mc "Error running git blame: %s" $err]
+        return 0
     }
 
     set fname {}
@@ -3929,30 +3947,30 @@ proc read_line_source {fd inst} {
     set id [lindex $line 0]
     set lnum [lindex $line 1]
     if {[string length $id] == 40 && [string is xdigit $id] &&
-	[string is digit -strict $lnum]} {
-	# look for "filename" line
-	foreach l $blamestuff($inst) {
-	    if {[string match "filename *" $l]} {
-		set fname [string range $l 9 end]
-		break
-	    }
-	}
+        [string is digit -strict $lnum]} {
+        # look for "filename" line
+        foreach l $blamestuff($inst) {
+            if {[string match "filename *" $l]} {
+                set fname [string range $l 9 end]
+                break
+            }
+        }
     }
     if {$fname ne {}} {
-	# all looks good, select it
-	if {$id eq $nullid} {
-	    # blame uses all-zeroes to mean not committed,
-	    # which would mean a change in the index
-	    set id $nullid2
-	}
-	if {[commitinview $id $curview]} {
-	    selectline [rowofcommit $id] 1 [list $fname $lnum] 1
-	} else {
-	    error_popup [mc "That line comes from commit %s, \
-			     which is not in this view" [shortids $id]]
-	}
+        # all looks good, select it
+        if {$id eq $nullid} {
+            # blame uses all-zeroes to mean not committed,
+            # which would mean a change in the index
+            set id $nullid2
+        }
+        if {[commitinview $id $curview]} {
+            selectline [rowofcommit $id] 1 [list $fname $lnum] 1
+        } else {
+            error_popup [mc "That line comes from commit %s, \
+                             which is not in this view" [shortids $id]]
+        }
     } else {
-	puts "oops couldn't parse git blame output"
+        puts "oops couldn't parse git blame output"
     }
     return 0
 }
@@ -3961,11 +3979,11 @@ proc read_line_source {fd inst} {
 proc delete_at_eof {f dir} {
     while {[gets $f line] >= 0} {}
     if {[eof $f]} {
-	if {[catch {close $f} err]} {
-	    error_popup "[mc "External diff viewer failed:"] $err"
-	}
-	file delete -force $dir
-	return 0
+        if {[catch {close $f} err]} {
+            error_popup "[mc "External diff viewer failed:"] $err"
+        }
+        file delete -force $dir
+        return 0
     }
     return 1
 }
@@ -3974,13 +3992,13 @@ proc delete_at_eof {f dir} {
 
 proc shellquote {str} {
     if {![string match "*\['\"\\ \t]*" $str]} {
-	return $str
+        return $str
     }
     if {![string match "*\['\"\\]*" $str]} {
-	return "\"$str\""
+        return "\"$str\""
     }
     if {![string match "*'*" $str]} {
-	return "'$str'"
+        return "'$str'"
     }
     return "\"[string map {\" \\\" \\ \\\\} $str]\""
 }
@@ -3988,10 +4006,10 @@ proc shellquote {str} {
 proc shellarglist {l} {
     set str {}
     foreach a $l {
-	if {$str ne {}} {
-	    append str " "
-	}
-	append str [shellquote $a]
+        if {$str ne {}} {
+            append str " "
+        }
+        append str [shellquote $a]
     }
     return $str
 }
@@ -4000,52 +4018,52 @@ proc shelldequote {str} {
     set ret {}
     set used -1
     while {1} {
-	incr used
-	if {![regexp -start $used -indices "\['\"\\\\ \t]" $str first]} {
-	    append ret [string range $str $used end]
-	    set used [string length $str]
-	    break
-	}
-	set first [lindex $first 0]
-	set ch [string index $str $first]
-	if {$first > $used} {
-	    append ret [string range $str $used [expr {$first - 1}]]
-	    set used $first
-	}
-	if {$ch eq " " || $ch eq "\t"} break
-	incr used
-	if {$ch eq "'"} {
-	    set first [string first "'" $str $used]
-	    if {$first < 0} {
-		error "unmatched single-quote"
-	    }
-	    append ret [string range $str $used [expr {$first - 1}]]
-	    set used $first
-	    continue
-	}
-	if {$ch eq "\\"} {
-	    if {$used >= [string length $str]} {
-		error "trailing backslash"
-	    }
-	    append ret [string index $str $used]
-	    continue
-	}
-	# here ch == "\""
-	while {1} {
-	    if {![regexp -start $used -indices "\[\"\\\\]" $str first]} {
-		error "unmatched double-quote"
-	    }
-	    set first [lindex $first 0]
-	    set ch [string index $str $first]
-	    if {$first > $used} {
-		append ret [string range $str $used [expr {$first - 1}]]
-		set used $first
-	    }
-	    if {$ch eq "\""} break
-	    incr used
-	    append ret [string index $str $used]
-	    incr used
-	}
+        incr used
+        if {![regexp -start $used -indices "\['\"\\\\ \t]" $str first]} {
+            append ret [string range $str $used end]
+            set used [string length $str]
+            break
+        }
+        set first [lindex $first 0]
+        set ch [string index $str $first]
+        if {$first > $used} {
+            append ret [string range $str $used [expr {$first - 1}]]
+            set used $first
+        }
+        if {$ch eq " " || $ch eq "\t"} break
+        incr used
+        if {$ch eq "'"} {
+            set first [string first "'" $str $used]
+            if {$first < 0} {
+                error "unmatched single-quote"
+            }
+            append ret [string range $str $used [expr {$first - 1}]]
+            set used $first
+            continue
+        }
+        if {$ch eq "\\"} {
+            if {$used >= [string length $str]} {
+                error "trailing backslash"
+            }
+            append ret [string index $str $used]
+            continue
+        }
+        # here ch == "\""
+        while {1} {
+            if {![regexp -start $used -indices "\[\"\\\\]" $str first]} {
+                error "unmatched double-quote"
+            }
+            set first [lindex $first 0]
+            set ch [string index $str $first]
+            if {$first > $used} {
+                append ret [string range $str $used [expr {$first - 1}]]
+                set used $first
+            }
+            if {$ch eq "\""} break
+            incr used
+            append ret [string index $str $used]
+            incr used
+        }
     }
     return [list $used $ret]
 }
@@ -4053,13 +4071,13 @@ proc shelldequote {str} {
 proc shellsplit {str} {
     set l {}
     while {1} {
-	set str [string trimleft $str]
-	if {$str eq {}} break
-	set dq [shelldequote $str]
-	set n [lindex $dq 0]
-	set word [lindex $dq 1]
-	set str [string range $str $n end]
-	lappend l $word
+        set str [string trimleft $str]
+        if {$str eq {}} break
+        set dq [shelldequote $str]
+        set n [lindex $dq 0]
+        set word [lindex $dq 1]
+        set str [string range $str $n end]
+        lappend l $word
     }
     return $l
 }
@@ -4068,11 +4086,11 @@ proc set_window_title {} {
     global appname curview viewname vrevs
     set rev [mc "All files"]
     if {$curview ne 0} {
-	if {$viewname($curview) eq [mc "Command line"]} {
-	    set rev [string map {"--gitk-symmetric-diff-marker" "--merge"} $vrevs($curview)]
-	} else {
-	    set rev $viewname($curview)
-	}
+        if {$viewname($curview) eq [mc "Command line"]} {
+            set rev [string map {"--gitk-symmetric-diff-marker" "--merge"} $vrevs($curview)]
+        } else {
+            set rev $viewname($curview)
+        }
     }
     wm title . "[reponame]: $rev - $appname"
 }
@@ -4086,8 +4104,8 @@ proc newview {ishighlight} {
     set newishighlight $ishighlight
     set top .gitkview
     if {[winfo exists $top]} {
-	raise $top
-	return
+        raise $top
+        return
     }
     decode_view_opts $nextviewnum $revtreeargs
     set newviewname($nextviewnum) "[mc "View"] $nextviewnum"
@@ -4136,29 +4154,29 @@ proc encode_view_opts {n} {
 
     set rargs [list]
     foreach opt $known_view_options {
-	set patterns [lindex $opt 3]
-	if {$patterns eq {}} continue
-	set pattern [lindex $patterns 0]
+        set patterns [lindex $opt 3]
+        if {$patterns eq {}} continue
+        set pattern [lindex $patterns 0]
 
-	if {[lindex $opt 1] eq "b"} {
-	    set val $newviewopts($n,[lindex $opt 0])
-	    if {$val} {
-		lappend rargs $pattern
-	    }
-	} elseif {[regexp {^r(\d+)$} [lindex $opt 1] type value]} {
-	    regexp {^(.*_)} [lindex $opt 0] uselessvar button_id
-	    set val $newviewopts($n,$button_id)
-	    if {$val eq $value} {
-		lappend rargs $pattern
-	    }
-	} else {
-	    set val $newviewopts($n,[lindex $opt 0])
-	    set val [string trim $val]
-	    if {$val ne {}} {
-		set pfix [string range $pattern 0 end-1]
-		lappend rargs $pfix$val
-	    }
-	}
+        if {[lindex $opt 1] eq "b"} {
+            set val $newviewopts($n,[lindex $opt 0])
+            if {$val} {
+                lappend rargs $pattern
+            }
+        } elseif {[regexp {^r(\d+)$} [lindex $opt 1] type value]} {
+            regexp {^(.*_)} [lindex $opt 0] uselessvar button_id
+            set val $newviewopts($n,$button_id)
+            if {$val eq $value} {
+                lappend rargs $pattern
+            }
+        } else {
+            set val $newviewopts($n,[lindex $opt 0])
+            set val [string trim $val]
+            if {$val ne {}} {
+                set pfix [string range $pattern 0 end-1]
+                lappend rargs $pfix$val
+            }
+        }
     }
     set rargs [concat $rargs [shellsplit $newviewopts($n,refs)]]
     return [concat $rargs [shellsplit $newviewopts($n,args)]]
@@ -4169,59 +4187,59 @@ proc decode_view_opts {n view_args} {
     global known_view_options newviewopts
 
     foreach opt $known_view_options {
-	set id [lindex $opt 0]
-	if {[lindex $opt 1] eq "b"} {
-	    # Checkboxes
-	    set val 0
+        set id [lindex $opt 0]
+        if {[lindex $opt 1] eq "b"} {
+            # Checkboxes
+            set val 0
         } elseif {[regexp {^r(\d+)$} [lindex $opt 1]]} {
-	    # Radiobuttons
-	    regexp {^(.*_)} $id uselessvar id
-	    set val 0
-	} else {
-	    # Text fields
-	    set val {}
-	}
-	set newviewopts($n,$id) $val
+            # Radiobuttons
+            regexp {^(.*_)} $id uselessvar id
+            set val 0
+        } else {
+            # Text fields
+            set val {}
+        }
+        set newviewopts($n,$id) $val
     }
     set oargs [list]
     set refargs [list]
     foreach arg $view_args {
-	if {[regexp -- {^-([0-9]+)$} $arg arg cnt]
-	    && ![info exists found(limit)]} {
-	    set newviewopts($n,limit) $cnt
-	    set found(limit) 1
-	    continue
-	}
-	catch { unset val }
-	foreach opt $known_view_options {
-	    set id [lindex $opt 0]
-	    if {[info exists found($id)]} continue
-	    foreach pattern [lindex $opt 3] {
-		if {![string match $pattern $arg]} continue
-		if {[lindex $opt 1] eq "b"} {
-		    # Check buttons
-		    set val 1
-		} elseif {[regexp {^r(\d+)$} [lindex $opt 1] match num]} {
-		    # Radio buttons
-		    regexp {^(.*_)} $id uselessvar id
-		    set val $num
-		} else {
-		    # Text input fields
-		    set size [string length $pattern]
-		    set val [string range $arg [expr {$size-1}] end]
-		}
-		set newviewopts($n,$id) $val
-		set found($id) 1
-		break
-	    }
-	    if {[info exists val]} break
-	}
-	if {[info exists val]} continue
-	if {[regexp {^-} $arg]} {
-	    lappend oargs $arg
-	} else {
-	    lappend refargs $arg
-	}
+        if {[regexp -- {^-([0-9]+)$} $arg arg cnt]
+            && ![info exists found(limit)]} {
+            set newviewopts($n,limit) $cnt
+            set found(limit) 1
+            continue
+        }
+        catch { unset val }
+        foreach opt $known_view_options {
+            set id [lindex $opt 0]
+            if {[info exists found($id)]} continue
+            foreach pattern [lindex $opt 3] {
+                if {![string match $pattern $arg]} continue
+                if {[lindex $opt 1] eq "b"} {
+                    # Check buttons
+                    set val 1
+                } elseif {[regexp {^r(\d+)$} [lindex $opt 1] match num]} {
+                    # Radio buttons
+                    regexp {^(.*_)} $id uselessvar id
+                    set val $num
+                } else {
+                    # Text input fields
+                    set size [string length $pattern]
+                    set val [string range $arg [expr {$size-1}] end]
+                }
+                set newviewopts($n,$id) $val
+                set found($id) 1
+                break
+            }
+            if {[info exists val]} break
+        }
+        if {[info exists val]} continue
+        if {[regexp {^-} $arg]} {
+            lappend oargs $arg
+        } else {
+            lappend refargs $arg
+        }
     }
     set newviewopts($n,refs) [shellarglist $refargs]
     set newviewopts($n,args) [shellarglist $oargs]
@@ -4231,9 +4249,9 @@ proc edit_or_newview {} {
     global curview
 
     if {$curview > 0} {
-	editview
+        editview
     } else {
-	newview 0
+        newview 0
     }
 }
 
@@ -4244,8 +4262,8 @@ proc editview {} {
 
     set top .gitkvedit-$curview
     if {[winfo exists $top]} {
-	raise $top
-	return
+        raise $top
+        return
     }
     decode_view_opts $curview $viewargs($curview)
     set newviewname($curview)      $viewname($curview)
@@ -4275,66 +4293,66 @@ proc vieweditor {top n title} {
     set cexpand 0
     set cnt 0
     foreach opt $known_view_options {
-	set id [lindex $opt 0]
-	set type [lindex $opt 1]
-	set flags [lindex $opt 2]
-	set title [eval [lindex $opt 4]]
-	set lxpad 0
+        set id [lindex $opt 0]
+        set type [lindex $opt 1]
+        set flags [lindex $opt 2]
+        set title [eval [lindex $opt 4]]
+        set lxpad 0
 
-	if {$flags eq "+" || $flags eq "*"} {
-	    set cframe $top.fr$cnt
-	    incr cnt
-	    ${NS}::frame $cframe
-	    pack $cframe -in $top -fill x -pady 3 -padx 3
-	    set cexpand [expr {$flags eq "*"}]
+        if {$flags eq "+" || $flags eq "*"} {
+            set cframe $top.fr$cnt
+            incr cnt
+            ${NS}::frame $cframe
+            pack $cframe -in $top -fill x -pady 3 -padx 3
+            set cexpand [expr {$flags eq "*"}]
         } elseif {$flags eq ".." || $flags eq "*."} {
-	    set cframe $top.fr$cnt
-	    incr cnt
-	    ${NS}::frame $cframe
-	    pack $cframe -in $top -fill x -pady 3 -padx [list 15 3]
-	    set cexpand [expr {$flags eq "*."}]
-	} else {
-	    set lxpad 5
-	}
+            set cframe $top.fr$cnt
+            incr cnt
+            ${NS}::frame $cframe
+            pack $cframe -in $top -fill x -pady 3 -padx [list 15 3]
+            set cexpand [expr {$flags eq "*."}]
+        } else {
+            set lxpad 5
+        }
 
-	if {$type eq "l"} {
+        if {$type eq "l"} {
             ${NS}::label $cframe.l_$id -text $title
             pack $cframe.l_$id -in $cframe -side left -pady [list 3 0] -anchor w
-	} elseif {$type eq "b"} {
-	    ${NS}::checkbutton $cframe.c_$id -text $title -variable newviewopts($n,$id)
-	    pack $cframe.c_$id -in $cframe -side left \
-		-padx [list $lxpad 0] -expand $cexpand -anchor w
-	} elseif {[regexp {^r(\d+)$} $type type sz]} {
-	    regexp {^(.*_)} $id uselessvar button_id
-	    ${NS}::radiobutton $cframe.c_$id -text $title -variable newviewopts($n,$button_id) -value $sz
-	    pack $cframe.c_$id -in $cframe -side left \
-		-padx [list $lxpad 0] -expand $cexpand -anchor w
-	} elseif {[regexp {^t(\d+)$} $type type sz]} {
-	    ${NS}::label $cframe.l_$id -text $title
-	    ${NS}::entry $cframe.e_$id -width $sz -background $bgcolor \
-		-textvariable newviewopts($n,$id)
-	    pack $cframe.l_$id -in $cframe -side left -padx [list $lxpad 0]
-	    pack $cframe.e_$id -in $cframe -side left -expand 1 -fill x
-	} elseif {[regexp {^t(\d+)=$} $type type sz]} {
-	    ${NS}::label $cframe.l_$id -text $title
-	    ${NS}::entry $cframe.e_$id -width $sz -background $bgcolor \
-		-textvariable newviewopts($n,$id)
-	    pack $cframe.l_$id -in $cframe -side top -pady [list 3 0] -anchor w
-	    pack $cframe.e_$id -in $cframe -side top -fill x
-	} elseif {$type eq "path"} {
-	    ${NS}::label $top.l -text $title
-	    pack $top.l -in $top -side top -pady [list 3 0] -anchor w -padx 3
-	    text $top.t -width 40 -height 5 -background $bgcolor
-	    if {[info exists viewfiles($n)]} {
-		foreach f $viewfiles($n) {
-		    $top.t insert end $f
-		    $top.t insert end "\n"
-		}
-		$top.t delete {end - 1c} end
-		$top.t mark set insert 0.0
-	    }
-	    pack $top.t -in $top -side top -pady [list 0 5] -fill both -expand 1 -padx 3
-	}
+        } elseif {$type eq "b"} {
+            ${NS}::checkbutton $cframe.c_$id -text $title -variable newviewopts($n,$id)
+            pack $cframe.c_$id -in $cframe -side left \
+                -padx [list $lxpad 0] -expand $cexpand -anchor w
+        } elseif {[regexp {^r(\d+)$} $type type sz]} {
+            regexp {^(.*_)} $id uselessvar button_id
+            ${NS}::radiobutton $cframe.c_$id -text $title -variable newviewopts($n,$button_id) -value $sz
+            pack $cframe.c_$id -in $cframe -side left \
+                -padx [list $lxpad 0] -expand $cexpand -anchor w
+        } elseif {[regexp {^t(\d+)$} $type type sz]} {
+            ${NS}::label $cframe.l_$id -text $title
+            ${NS}::entry $cframe.e_$id -width $sz -background $bgcolor \
+                -textvariable newviewopts($n,$id)
+            pack $cframe.l_$id -in $cframe -side left -padx [list $lxpad 0]
+            pack $cframe.e_$id -in $cframe -side left -expand 1 -fill x
+        } elseif {[regexp {^t(\d+)=$} $type type sz]} {
+            ${NS}::label $cframe.l_$id -text $title
+            ${NS}::entry $cframe.e_$id -width $sz -background $bgcolor \
+                -textvariable newviewopts($n,$id)
+            pack $cframe.l_$id -in $cframe -side top -pady [list 3 0] -anchor w
+            pack $cframe.e_$id -in $cframe -side top -fill x
+        } elseif {$type eq "path"} {
+            ${NS}::label $top.l -text $title
+            pack $top.l -in $top -side top -pady [list 3 0] -anchor w -padx 3
+            text $top.t -width 40 -height 5 -background $bgcolor
+            if {[info exists viewfiles($n)]} {
+                foreach f $viewfiles($n) {
+                    $top.t insert end $f
+                    $top.t insert end "\n"
+                }
+                $top.t delete {end - 1c} end
+                $top.t mark set insert 0.0
+            }
+            pack $top.t -in $top -side top -pady [list 0 5] -fill both -expand 1 -padx 3
+        }
     }
 
     ${NS}::frame $top.buts
@@ -4355,10 +4373,10 @@ proc vieweditor {top n title} {
 proc doviewmenu {m first cmd op argv} {
     set nmenu [$m index end]
     for {set i $first} {$i <= $nmenu} {incr i} {
-	if {[$m entrycget $i -command] eq $cmd} {
-	    eval $m $op $i $argv
-	    break
-	}
+        if {[$m entrycget $i -command] eq $cmd} {
+            eval $m $op $i $argv
+            break
+        }
     }
 }
 
@@ -4375,53 +4393,53 @@ proc newviewok {top n {apply 0}} {
     global viewargs viewargscmd newviewopts viewhlmenu
 
     if {[catch {
-	set newargs [encode_view_opts $n]
+        set newargs [encode_view_opts $n]
     } err]} {
-	error_popup "[mc "Error in commit selection arguments:"] $err" $top
-	return
+        error_popup "[mc "Error in commit selection arguments:"] $err" $top
+        return
     }
     set files {}
     foreach f [split [$top.t get 0.0 end] "\n"] {
-	set ft [string trim $f]
-	if {$ft ne {}} {
-	    lappend files $ft
-	}
+        set ft [string trim $f]
+        if {$ft ne {}} {
+            lappend files $ft
+        }
     }
     if {![info exists viewfiles($n)]} {
-	# creating a new view
-	incr nextviewnum
-	set viewname($n) $newviewname($n)
-	set viewperm($n) $newviewopts($n,perm)
-	set viewchanged($n) 1
-	set viewfiles($n) $files
-	set viewargs($n) $newargs
-	set viewargscmd($n) $newviewopts($n,cmd)
-	addviewmenu $n
-	if {!$newishighlight} {
-	    run showview $n
-	} else {
-	    run addvhighlight $n
-	}
+        # creating a new view
+        incr nextviewnum
+        set viewname($n) $newviewname($n)
+        set viewperm($n) $newviewopts($n,perm)
+        set viewchanged($n) 1
+        set viewfiles($n) $files
+        set viewargs($n) $newargs
+        set viewargscmd($n) $newviewopts($n,cmd)
+        addviewmenu $n
+        if {!$newishighlight} {
+            run showview $n
+        } else {
+            run addvhighlight $n
+        }
     } else {
-	# editing an existing view
-	set viewperm($n) $newviewopts($n,perm)
-	set viewchanged($n) 1
-	if {$newviewname($n) ne $viewname($n)} {
-	    set viewname($n) $newviewname($n)
-	    doviewmenu .bar.view 5 [list showview $n] \
-		entryconf [list -label $viewname($n)]
-	    # doviewmenu $viewhlmenu 1 [list addvhighlight $n] \
-		# entryconf [list -label $viewname($n) -value $viewname($n)]
-	}
-	if {$files ne $viewfiles($n) || $newargs ne $viewargs($n) || \
-		$newviewopts($n,cmd) ne $viewargscmd($n)} {
-	    set viewfiles($n) $files
-	    set viewargs($n) $newargs
-	    set viewargscmd($n) $newviewopts($n,cmd)
-	    if {$curview == $n} {
-		run reloadcommits
-	    }
-	}
+        # editing an existing view
+        set viewperm($n) $newviewopts($n,perm)
+        set viewchanged($n) 1
+        if {$newviewname($n) ne $viewname($n)} {
+            set viewname($n) $newviewname($n)
+            doviewmenu .bar.view 5 [list showview $n] \
+                entryconf [list -label $viewname($n)]
+            # doviewmenu $viewhlmenu 1 [list addvhighlight $n] \
+                # entryconf [list -label $viewname($n) -value $viewname($n)]
+        }
+        if {$files ne $viewfiles($n) || $newargs ne $viewargs($n) || \
+                $newviewopts($n,cmd) ne $viewargscmd($n)} {
+            set viewfiles($n) $files
+            set viewargs($n) $newargs
+            set viewargscmd($n) $newviewopts($n,cmd)
+            if {$curview == $n} {
+                run reloadcommits
+            }
+        }
     }
     if {$apply} return
     catch {destroy $top}
@@ -4432,8 +4450,8 @@ proc delview {} {
 
     if {$curview == 0} return
     if {[info exists hlview] && $hlview == $curview} {
-	set selectedhlview [mc "None"]
-	unset hlview
+        set selectedhlview [mc "None"]
+        unset hlview
     }
     allviewmenus $curview delete
     set viewperm($curview) 0
@@ -4445,7 +4463,7 @@ proc addviewmenu {n} {
     global viewname viewhlmenu
 
     .bar.view add radiobutton -label $viewname($n) \
-	-command [list showview $n] -variable selectedview -value $n
+        -command [list showview $n] -variable selectedview -value $n
     #$viewhlmenu add radiobutton -label $viewname($n) \
     #	-command [list addvhighlight $n] -variable selectedhlview
 }
@@ -4470,22 +4488,22 @@ proc showview {n} {
     set ybot [expr {[lindex $span 1] * $ymax}]
     set yscreen [expr {($ybot - $ytop) / 2}]
     if {$selectedline ne {}} {
-	set selid $currentid
-	set y [yc $selectedline]
-	if {$ytop < $y && $y < $ybot} {
-	    set yscreen [expr {$y - $ytop}]
-	}
+        set selid $currentid
+        set y [yc $selectedline]
+        if {$ytop < $y && $y < $ybot} {
+            set yscreen [expr {$y - $ytop}]
+        }
     } elseif {[info exists pending_select]} {
-	set selid $pending_select
-	unset pending_select
+        set selid $pending_select
+        unset pending_select
     }
     unselectline
     normalline
     unset -nocomplain treediffs
     clear_display
     if {[info exists hlview] && $hlview == $n} {
-	unset hlview
-	set selectedhlview [mc "None"]
+        unset hlview
+        set selectedhlview [mc "None"]
     }
     unset -nocomplain commitinterest
     unset -nocomplain cached_commitrow
@@ -4498,8 +4516,8 @@ proc showview {n} {
 
     run refill_reflist
     if {![info exists viewcomplete($n)]} {
-	getcommits $selid
-	return
+        getcommits $selid
+        return
     }
 
     set displayorder {}
@@ -4519,39 +4537,39 @@ proc showview {n} {
     set yf 0
     set row {}
     if {$selid ne {} && [commitinview $selid $n]} {
-	set row [rowofcommit $selid]
-	# try to get the selected row in the same position on the screen
-	set ymax [lindex [$canv cget -scrollregion] 3]
-	set ytop [expr {[yc $row] - $yscreen}]
-	if {$ytop < 0} {
-	    set ytop 0
-	}
-	set yf [expr {$ytop * 1.0 / $ymax}]
+        set row [rowofcommit $selid]
+        # try to get the selected row in the same position on the screen
+        set ymax [lindex [$canv cget -scrollregion] 3]
+        set ytop [expr {[yc $row] - $yscreen}]
+        if {$ytop < 0} {
+            set ytop 0
+        }
+        set yf [expr {$ytop * 1.0 / $ymax}]
     }
     allcanvs yview moveto $yf
     drawvisible
     if {$row ne {}} {
-	selectline $row 0
+        selectline $row 0
     } elseif {!$viewcomplete($n)} {
-	reset_pending_select $selid
+        reset_pending_select $selid
     } else {
-	reset_pending_select {}
+        reset_pending_select {}
 
-	if {[commitinview $pending_select $curview]} {
-	    selectline [rowofcommit $pending_select] 1
-	} else {
-	    set row [first_real_row]
-	    if {$row < $numcommits} {
-		selectline $row 0
-	    }
-	}
+        if {[commitinview $pending_select $curview]} {
+            selectline [rowofcommit $pending_select] 1
+        } else {
+            set row [first_real_row]
+            if {$row < $numcommits} {
+                selectline $row 0
+            }
+        }
     }
     if {!$viewcomplete($n)} {
-	if {$numcommits == 0} {
-	    show_status [mc "Reading commits..."]
-	}
+        if {$numcommits == 0} {
+            show_status [mc "Reading commits..."]
+        }
     } elseif {$numcommits == 0} {
-	show_status [mc "No commits selected"]
+        show_status [mc "No commits selected"]
     }
     set_window_title
 }
@@ -4562,16 +4580,16 @@ proc ishighlighted {id} {
     global vhighlights fhighlights nhighlights rhighlights
 
     if {[info exists nhighlights($id)] && $nhighlights($id) > 0} {
-	return $nhighlights($id)
+        return $nhighlights($id)
     }
     if {[info exists vhighlights($id)] && $vhighlights($id) > 0} {
-	return $vhighlights($id)
+        return $vhighlights($id)
     }
     if {[info exists fhighlights($id)] && $fhighlights($id) > 0} {
-	return $fhighlights($id)
+        return $fhighlights($id)
     }
     if {[info exists rhighlights($id)] && $rhighlights($id) > 0} {
-	return $rhighlights($id)
+        return $rhighlights($id)
     }
     return 0
 }
@@ -4584,14 +4602,14 @@ proc bolden {id font} {
     lappend boldids $id
     $canv itemconf $linehtag($id) -font $font
     if {[info exists currentid] && $id eq $currentid} {
-	$canv delete secsel
-	set t [eval $canv create rect [$canv bbox $linehtag($id)] \
-		   -outline {{}} -tags secsel \
-		   -fill [$canv cget -selectbackground]]
-	$canv lower $t
+        $canv delete secsel
+        set t [eval $canv create rect [$canv bbox $linehtag($id)] \
+                   -outline {{}} -tags secsel \
+                   -fill [$canv cget -selectbackground]]
+        $canv lower $t
     }
     if {[info exists markedid] && $id eq $markedid} {
-	make_idmark $id
+        make_idmark $id
     }
 }
 
@@ -4602,11 +4620,11 @@ proc bolden_name {id font} {
     lappend boldnameids $id
     $canv2 itemconf $linentag($id) -font $font
     if {[info exists currentid] && $id eq $currentid} {
-	$canv2 delete secsel
-	set t [eval $canv2 create rect [$canv2 bbox $linentag($id)] \
-		   -outline {{}} -tags secsel \
-		   -fill [$canv2 cget -selectbackground]]
-	$canv2 lower $t
+        $canv2 delete secsel
+        set t [eval $canv2 create rect [$canv2 bbox $linentag($id)] \
+                   -outline {{}} -tags secsel \
+                   -fill [$canv2 cget -selectbackground]]
+        $canv2 lower $t
     }
 }
 
@@ -4615,11 +4633,11 @@ proc unbolden {} {
 
     set stillbold {}
     foreach id $boldids {
-	if {![ishighlighted $id]} {
-	    bolden $id mainfont
-	} else {
-	    lappend stillbold $id
-	}
+        if {![ishighlighted $id]} {
+            bolden $id mainfont
+        } else {
+            lappend stillbold $id
+        }
     }
     set boldids $stillbold
 }
@@ -4628,15 +4646,15 @@ proc addvhighlight {n} {
     global hlview viewcomplete curview vhl_done commitidx
 
     if {[info exists hlview]} {
-	delvhighlight
+        delvhighlight
     }
     set hlview $n
     if {$n != $curview && ![info exists viewcomplete($n)]} {
-	start_rev_list $n
+        start_rev_list $n
     }
     set vhl_done $commitidx($hlview)
     if {$vhl_done > 0} {
-	drawvisible
+        drawvisible
     }
 }
 
@@ -4657,16 +4675,16 @@ proc vhighlightmore {} {
     set r0 [lindex $vr 0]
     set r1 [lindex $vr 1]
     for {set i $vhl_done} {$i < $max} {incr i} {
-	set id [commitonrow $i $hlview]
-	if {[commitinview $id $curview]} {
-	    set row [rowofcommit $id]
-	    if {$r0 <= $row && $row <= $r1} {
-		if {![highlighted $row]} {
-		    bolden $id mainfontbold
-		}
-		set vhighlights($id) 1
-	    }
-	}
+        set id [commitonrow $i $hlview]
+        if {[commitinview $id $curview]} {
+            set row [rowofcommit $id]
+            if {$r0 <= $row && $row <= $r1} {
+                if {![highlighted $row]} {
+                    bolden $id mainfontbold
+                }
+                set vhighlights($id) 1
+            }
+        }
     }
     set vhl_done $max
     return 0
@@ -4676,12 +4694,12 @@ proc askvhighlight {row id} {
     global hlview vhighlights iddrawn
 
     if {[commitinview $id $hlview]} {
-	if {[info exists iddrawn($id)] && ![ishighlighted $id]} {
-	    bolden $id mainfontbold
-	}
-	set vhighlights($id) 1
+        if {[info exists iddrawn($id)] && ![ishighlighted $id]} {
+            bolden $id mainfontbold
+        }
+        set vhighlights($id) 1
     } else {
-	set vhighlights($id) 0
+        set vhighlights($id) 0
     }
 }
 
@@ -4690,18 +4708,18 @@ proc hfiles_change {} {
     global highlight_paths
 
     if {[info exists filehighlight]} {
-	# delete previous highlights
-	catch {close $filehighlight}
-	unset filehighlight
-	unset -nocomplain fhighlights
-	unbolden
-	unhighlight_filelist
+        # delete previous highlights
+        catch {close $filehighlight}
+        unset filehighlight
+        unset -nocomplain fhighlights
+        unbolden
+        unhighlight_filelist
     }
     set highlight_paths {}
     after cancel do_file_hl $fh_serial
     incr fh_serial
     if {$highlight_files ne {}} {
-	after 300 do_file_hl $fh_serial
+        after 300 do_file_hl $fh_serial
     }
 }
 
@@ -4710,21 +4728,21 @@ proc gdttype_change {name ix op} {
 
     stopfinding
     if {$findstring ne {}} {
-	if {$gdttype eq [mc "containing:"]} {
-	    if {$highlight_files ne {}} {
-		set highlight_files {}
-		hfiles_change
-	    }
-	    findcom_change
-	} else {
-	    if {$findpattern ne {}} {
-		set findpattern {}
-		findcom_change
-	    }
-	    set highlight_files $findstring
-	    hfiles_change
-	}
-	drawvisible
+        if {$gdttype eq [mc "containing:"]} {
+            if {$highlight_files ne {}} {
+                set highlight_files {}
+                hfiles_change
+            }
+            findcom_change
+        } else {
+            if {$findpattern ne {}} {
+                set findpattern {}
+                findcom_change
+            }
+            set highlight_files $findstring
+            hfiles_change
+        }
+        drawvisible
     }
     # enable/disable findtype/findloc menus too
 }
@@ -4734,12 +4752,12 @@ proc find_change {name ix op} {
 
     stopfinding
     if {$gdttype eq [mc "containing:"]} {
-	findcom_change
+        findcom_change
     } else {
-	if {$highlight_files ne $findstring} {
-	    set highlight_files $findstring
-	    hfiles_change
-	}
+        if {$highlight_files ne $findstring} {
+            set highlight_files $findstring
+            hfiles_change
+        }
     }
     drawvisible
 }
@@ -4751,33 +4769,33 @@ proc findcom_change args {
     stopfinding
     # delete previous highlights, if any
     foreach id $boldnameids {
-	bolden_name $id mainfont
+        bolden_name $id mainfont
     }
     set boldnameids {}
     unset -nocomplain nhighlights
     unbolden
     unmarkmatches
     if {$gdttype ne [mc "containing:"] || $findstring eq {}} {
-	set findpattern {}
+        set findpattern {}
     } elseif {$findtype eq [mc "Regexp"]} {
-	set findpattern $findstring
+        set findpattern $findstring
     } else {
-	set e [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} \
-		   $findstring]
-	set findpattern "*$e*"
+        set e [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} \
+                   $findstring]
+        set findpattern "*$e*"
     }
 }
 
 proc makepatterns {l} {
     set ret {}
     foreach e $l {
-	set ee [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} $e]
-	if {[string index $ee end] eq "/"} {
-	    lappend ret "$ee*"
-	} else {
-	    lappend ret $ee
-	    lappend ret "$ee/*"
-	}
+        set ee [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} $e]
+        if {[string index $ee end] eq "/"} {
+            lappend ret "$ee*"
+        } else {
+            lappend ret $ee
+            lappend ret "$ee/*"
+        }
     }
     return $ret
 }
@@ -4787,26 +4805,26 @@ proc do_file_hl {serial} {
     global cdup findtype
 
     if {$gdttype eq [mc "touching paths:"]} {
-	# If "exact" match then convert backslashes to forward slashes.
-	# Most useful to support Windows-flavoured file paths.
-	if {$findtype eq [mc "Exact"]} {
-	    set highlight_files [string map {"\\" "/"} $highlight_files]
-	}
-	if {[catch {set paths [shellsplit $highlight_files]}]} return
-	set highlight_paths [makepatterns $paths]
-	highlight_filelist
-	set relative_paths {}
-	foreach path $paths {
-	    lappend relative_paths [file join $cdup $path]
-	}
-	set gdtargs [concat -- $relative_paths]
+        # If "exact" match then convert backslashes to forward slashes.
+        # Most useful to support Windows-flavoured file paths.
+        if {$findtype eq [mc "Exact"]} {
+            set highlight_files [string map {"\\" "/"} $highlight_files]
+        }
+        if {[catch {set paths [shellsplit $highlight_files]}]} return
+        set highlight_paths [makepatterns $paths]
+        highlight_filelist
+        set relative_paths {}
+        foreach path $paths {
+            lappend relative_paths [file join $cdup $path]
+        }
+        set gdtargs [concat -- $relative_paths]
     } elseif {$gdttype eq [mc "adding/removing string:"]} {
-	set gdtargs [list "-S$highlight_files"]
+        set gdtargs [list "-S$highlight_files"]
     } elseif {$gdttype eq [mc "changing lines matching:"]} {
-	set gdtargs [list "-G$highlight_files"]
+        set gdtargs [list "-G$highlight_files"]
     } else {
-	# must be "containing:", i.e. we're searching commit info
-	return
+        # must be "containing:", i.e. we're searching commit info
+        return
     }
     set cmd [concat | git diff-tree -r -s --stdin $gdtargs]
     set filehighlight [open $cmd r+]
@@ -4821,9 +4839,9 @@ proc flushhighlights {} {
     global filehighlight fhl_list
 
     if {[info exists filehighlight]} {
-	lappend fhl_list {}
-	puts $filehighlight ""
-	flush $filehighlight
+        lappend fhl_list {}
+        puts $filehighlight ""
+        flush $filehighlight
     }
 }
 
@@ -4840,34 +4858,34 @@ proc readfhighlight {} {
     global fhl_list find_dirn
 
     if {![info exists filehighlight]} {
-	return 0
+        return 0
     }
     set nr 0
     while {[incr nr] <= 100 && [gets $filehighlight line] >= 0} {
-	set line [string trim $line]
-	set i [lsearch -exact $fhl_list $line]
-	if {$i < 0} continue
-	for {set j 0} {$j < $i} {incr j} {
-	    set id [lindex $fhl_list $j]
-	    set fhighlights($id) 0
-	}
-	set fhl_list [lrange $fhl_list [expr {$i+1}] end]
-	if {$line eq {}} continue
-	if {![commitinview $line $curview]} continue
-	if {[info exists iddrawn($line)] && ![ishighlighted $line]} {
-	    bolden $line mainfontbold
-	}
-	set fhighlights($line) 1
+        set line [string trim $line]
+        set i [lsearch -exact $fhl_list $line]
+        if {$i < 0} continue
+        for {set j 0} {$j < $i} {incr j} {
+            set id [lindex $fhl_list $j]
+            set fhighlights($id) 0
+        }
+        set fhl_list [lrange $fhl_list [expr {$i+1}] end]
+        if {$line eq {}} continue
+        if {![commitinview $line $curview]} continue
+        if {[info exists iddrawn($line)] && ![ishighlighted $line]} {
+            bolden $line mainfontbold
+        }
+        set fhighlights($line) 1
     }
     if {[eof $filehighlight]} {
-	# strange...
-	puts "oops, git diff-tree died"
-	catch {close $filehighlight}
-	unset filehighlight
-	return 0
+        # strange...
+        puts "oops, git diff-tree died"
+        catch {close $filehighlight}
+        unset filehighlight
+        return 0
     }
     if {[info exists find_dirn]} {
-	run findmore
+        run findmore
     }
     return 1
 }
@@ -4876,11 +4894,11 @@ proc doesmatch {f} {
     global findtype findpattern
 
     if {$findtype eq [mc "Regexp"]} {
-	return [regexp $findpattern $f]
+        return [regexp $findpattern $f]
     } elseif {$findtype eq [mc "IgnCase"]} {
-	return [string match -nocase $findpattern $f]
+        return [string match -nocase $findpattern $f]
     } else {
-	return [string match $findpattern $f]
+        return [string match $findpattern $f]
     }
 }
 
@@ -4890,32 +4908,32 @@ proc askfindhighlight {row id} {
     global markingmatches
 
     if {![info exists commitinfo($id)]} {
-	getcommit $id
+        getcommit $id
     }
     set info $commitinfo($id)
     set isbold 0
     set fldtypes [list [mc Headline] [mc Author] "" [mc Committer] "" [mc Comments]]
     foreach f $info ty $fldtypes {
-	if {$ty eq ""} continue
-	if {($findloc eq [mc "All fields"] || $findloc eq $ty) &&
-	    [doesmatch $f]} {
-	    if {$ty eq [mc "Author"]} {
-		set isbold 2
-		break
-	    }
-	    set isbold 1
-	}
+        if {$ty eq ""} continue
+        if {($findloc eq [mc "All fields"] || $findloc eq $ty) &&
+            [doesmatch $f]} {
+            if {$ty eq [mc "Author"]} {
+                set isbold 2
+                break
+            }
+            set isbold 1
+        }
     }
     if {$isbold && [info exists iddrawn($id)]} {
-	if {![ishighlighted $id]} {
-	    bolden $id mainfontbold
-	    if {$isbold > 1} {
-		bolden_name $id mainfontbold
-	    }
-	}
-	if {$markingmatches} {
-	    markrowmatches $row $id
-	}
+        if {![ishighlighted $id]} {
+            bolden $id mainfontbold
+            if {$isbold > 1} {
+                bolden_name $id mainfontbold
+            }
+        }
+        if {$markingmatches} {
+            markrowmatches $row $id
+        }
     }
     set nhighlights($id) $isbold
 }
@@ -4928,18 +4946,18 @@ proc markrowmatches {row id} {
     $canv delete match$row
     $canv2 delete match$row
     if {$findloc eq [mc "All fields"] || $findloc eq [mc "Headline"]} {
-	set m [findmatches $headline]
-	if {$m ne {}} {
-	    markmatches $canv $row $headline $linehtag($id) $m \
-		[$canv itemcget $linehtag($id) -font] $row
-	}
+        set m [findmatches $headline]
+        if {$m ne {}} {
+            markmatches $canv $row $headline $linehtag($id) $m \
+                [$canv itemcget $linehtag($id) -font] $row
+        }
     }
     if {$findloc eq [mc "All fields"] || $findloc eq [mc "Author"]} {
-	set m [findmatches $author]
-	if {$m ne {}} {
-	    markmatches $canv2 $row $author $linentag($id) $m \
-		[$canv2 itemcget $linentag($id) -font] $row
-	}
+        set m [findmatches $author]
+        if {$m ne {}} {
+            markmatches $canv2 $row $author $linentag($id) $m \
+                [$canv2 itemcget $linentag($id) -font] $row
+        }
     }
 }
 
@@ -4948,7 +4966,7 @@ proc vrel_change {name ix op} {
 
     rhighlight_none
     if {$highlight_related ne [mc "None"]} {
-	run drawvisible
+        run drawvisible
     }
 }
 
@@ -4962,8 +4980,8 @@ proc rhighlight_sel {a} {
     unset -nocomplain ancestor
     set anc_todo [list $a]
     if {$highlight_related ne [mc "None"]} {
-	rhighlight_none
-	run drawvisible
+        rhighlight_none
+        run drawvisible
     }
 }
 
@@ -4983,24 +5001,24 @@ proc is_descendent {a} {
     set leftover {}
     set done 0
     for {set i 0} {$i < [llength $todo]} {incr i} {
-	set do [lindex $todo $i]
-	if {[rowofcommit $do] < $la} {
-	    lappend leftover $do
-	    continue
-	}
-	foreach nk $children($v,$do) {
-	    if {![info exists descendent($nk)]} {
-		set descendent($nk) 1
-		lappend todo $nk
-		if {$nk eq $a} {
-		    set done 1
-		}
-	    }
-	}
-	if {$done} {
-	    set desc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
-	    return
-	}
+        set do [lindex $todo $i]
+        if {[rowofcommit $do] < $la} {
+            lappend leftover $do
+            continue
+        }
+        foreach nk $children($v,$do) {
+            if {![info exists descendent($nk)]} {
+                set descendent($nk) 1
+                lappend todo $nk
+                if {$nk eq $a} {
+                    set done 1
+                }
+            }
+        }
+        if {$done} {
+            set desc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
+            return
+        }
     }
     set descendent($a) 0
     set desc_todo $leftover
@@ -5015,24 +5033,24 @@ proc is_ancestor {a} {
     set leftover {}
     set done 0
     for {set i 0} {$i < [llength $todo]} {incr i} {
-	set do [lindex $todo $i]
-	if {![commitinview $do $v] || [rowofcommit $do] > $la} {
-	    lappend leftover $do
-	    continue
-	}
-	foreach np $parents($v,$do) {
-	    if {![info exists ancestor($np)]} {
-		set ancestor($np) 1
-		lappend todo $np
-		if {$np eq $a} {
-		    set done 1
-		}
-	    }
-	}
-	if {$done} {
-	    set anc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
-	    return
-	}
+        set do [lindex $todo $i]
+        if {![commitinview $do $v] || [rowofcommit $do] > $la} {
+            lappend leftover $do
+            continue
+        }
+        foreach np $parents($v,$do) {
+            if {![info exists ancestor($np)]} {
+                set ancestor($np) 1
+                lappend todo $np
+                if {$np eq $a} {
+                    set done 1
+                }
+            }
+        }
+        if {$done} {
+            set anc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
+            return
+        }
     }
     set ancestor($a) 0
     set anc_todo $leftover
@@ -5045,26 +5063,26 @@ proc askrelhighlight {row id} {
     if {$selectedline eq {}} return
     set isbold 0
     if {$highlight_related eq [mc "Descendant"] ||
-	$highlight_related eq [mc "Not descendant"]} {
-	if {![info exists descendent($id)]} {
-	    is_descendent $id
-	}
-	if {$descendent($id) == ($highlight_related eq [mc "Descendant"])} {
-	    set isbold 1
-	}
+        $highlight_related eq [mc "Not descendant"]} {
+        if {![info exists descendent($id)]} {
+            is_descendent $id
+        }
+        if {$descendent($id) == ($highlight_related eq [mc "Descendant"])} {
+            set isbold 1
+        }
     } elseif {$highlight_related eq [mc "Ancestor"] ||
-	      $highlight_related eq [mc "Not ancestor"]} {
-	if {![info exists ancestor($id)]} {
-	    is_ancestor $id
-	}
-	if {$ancestor($id) == ($highlight_related eq [mc "Ancestor"])} {
-	    set isbold 1
-	}
+              $highlight_related eq [mc "Not ancestor"]} {
+        if {![info exists ancestor($id)]} {
+            is_ancestor $id
+        }
+        if {$ancestor($id) == ($highlight_related eq [mc "Ancestor"])} {
+            set isbold 1
+        }
     }
     if {[info exists iddrawn($id)]} {
-	if {$isbold && ![ishighlighted $id]} {
-	    bolden $id mainfontbold
-	}
+        if {$isbold && ![ishighlighted $id]} {
+            bolden $id mainfontbold
+        }
     }
     set rhighlights($id) $isbold
 }
@@ -5074,13 +5092,13 @@ proc askrelhighlight {row id} {
 proc shortids {ids} {
     set res {}
     foreach id $ids {
-	if {[llength $id] > 1} {
-	    lappend res [shortids $id]
-	} elseif {[regexp {^[0-9a-f]{40}$} $id]} {
-	    lappend res [string range $id 0 7]
-	} else {
-	    lappend res $id
-	}
+        if {[llength $id] > 1} {
+            lappend res [shortids $id]
+        } elseif {[regexp {^[0-9a-f]{40}$} $id]} {
+            lappend res [string range $id 0 7]
+        } else {
+            lappend res $id
+        }
     }
     return $res
 }
@@ -5089,10 +5107,10 @@ proc ntimes {n o} {
     set ret {}
     set o [list $o]
     for {set mask 1} {$mask <= $n} {incr mask $mask} {
-	if {($n & $mask) != 0} {
-	    set ret [concat $ret $o]
-	}
-	set o [concat $o $o]
+        if {($n & $mask) != 0} {
+            set ret [concat $ret $o]
+        }
+        set o [concat $o $o]
     }
     return $ret
 }
@@ -5102,41 +5120,41 @@ proc ordertoken {id} {
     global nullid nullid2
 
     if {[info exists ordertok($id)]} {
-	return $ordertok($id)
+        return $ordertok($id)
     }
     set origid $id
     set todo {}
     while {1} {
-	if {[info exists varcid($curview,$id)]} {
-	    set a $varcid($curview,$id)
-	    set p [lindex $varcstart($curview) $a]
-	} else {
-	    set p [lindex $children($curview,$id) 0]
-	}
-	if {[info exists ordertok($p)]} {
-	    set tok $ordertok($p)
-	    break
-	}
-	set id [first_real_child $curview,$p]
-	if {$id eq {}} {
-	    # it's a root
-	    set tok [lindex $varctok($curview) $varcid($curview,$p)]
-	    break
-	}
-	if {[llength $parents($curview,$id)] == 1} {
-	    lappend todo [list $p {}]
-	} else {
-	    set j [lsearch -exact $parents($curview,$id) $p]
-	    if {$j < 0} {
-		puts "oops didn't find [shortids $p] in parents of [shortids $id]"
-	    }
-	    lappend todo [list $p [strrep $j]]
-	}
+        if {[info exists varcid($curview,$id)]} {
+            set a $varcid($curview,$id)
+            set p [lindex $varcstart($curview) $a]
+        } else {
+            set p [lindex $children($curview,$id) 0]
+        }
+        if {[info exists ordertok($p)]} {
+            set tok $ordertok($p)
+            break
+        }
+        set id [first_real_child $curview,$p]
+        if {$id eq {}} {
+            # it's a root
+            set tok [lindex $varctok($curview) $varcid($curview,$p)]
+            break
+        }
+        if {[llength $parents($curview,$id)] == 1} {
+            lappend todo [list $p {}]
+        } else {
+            set j [lsearch -exact $parents($curview,$id) $p]
+            if {$j < 0} {
+                puts "oops didn't find [shortids $p] in parents of [shortids $id]"
+            }
+            lappend todo [list $p [strrep $j]]
+        }
     }
     for {set i [llength $todo]} {[incr i -1] >= 0} {} {
-	set p [lindex $todo $i 0]
-	append tok [lindex $todo $i 1]
-	set ordertok($p) $tok
+        set p [lindex $todo $i 0]
+        append tok [lindex $todo $i 1]
+        set ordertok($p) $tok
     }
     set ordertok($origid) $tok
     return $tok
@@ -5147,19 +5165,19 @@ proc ordertoken {id} {
 proc idcol {idlist id {i 0}} {
     set t [ordertoken $id]
     if {$i < 0} {
-	set i 0
+        set i 0
     }
     if {$i >= [llength $idlist] || $t < [ordertoken [lindex $idlist $i]]} {
-	if {$i > [llength $idlist]} {
-	    set i [llength $idlist]
-	}
-	while {[incr i -1] >= 0 && $t < [ordertoken [lindex $idlist $i]]} {}
-	incr i
+        if {$i > [llength $idlist]} {
+            set i [llength $idlist]
+        }
+        while {[incr i -1] >= 0 && $t < [ordertoken [lindex $idlist $i]]} {}
+        incr i
     } else {
-	if {$t > [ordertoken [lindex $idlist $i]]} {
-	    while {[incr i] < [llength $idlist] &&
-		   $t >= [ordertoken [lindex $idlist $i]]} {}
-	}
+        if {$t > [ordertoken [lindex $idlist $i]]} {
+            while {[incr i] < [llength $idlist] &&
+                   $t >= [ordertoken [lindex $idlist $i]]} {}
+        }
     }
     return $i
 }
@@ -5204,12 +5222,12 @@ proc visiblerows {} {
     set y0 [expr {int([lindex $f 0] * $ymax)}]
     set r0 [expr {int(($y0 - 3) / $linespc) - 1}]
     if {$r0 < 0} {
-	set r0 0
+        set r0 0
     }
     set y1 [expr {int([lindex $f 1] * $ymax)}]
     set r1 [expr {int(($y1 - 3) / $linespc) + 1}]
     if {$r1 >= $numcommits} {
-	set r1 [expr {$numcommits - 1}]
+        set r1 [expr {$numcommits - 1}]
     }
     return [list $r0 $r1]
 }
@@ -5220,13 +5238,13 @@ proc layoutmore {} {
     global lastscrollset lastscrollrows
 
     if {$lastscrollrows < 100 || $viewcomplete($curview) ||
-	[clock clicks -milliseconds] - $lastscrollset > 500} {
-	setcanvscroll
+        [clock clicks -milliseconds] - $lastscrollset > 500} {
+        setcanvscroll
     }
     if {[info exists pending_select] &&
-	[commitinview $pending_select $curview]} {
-	update
-	selectline [rowofcommit $pending_select] 1
+        [commitinview $pending_select $curview]} {
+        update
+        selectline [rowofcommit $pending_select] 1
     }
     drawvisible
 }
@@ -5238,13 +5256,13 @@ proc get_viewmainhead {view} {
     global viewmainheadid vfilelimit viewinstances mainheadid
 
     catch {
-	set rfd [open [concat | git rev-list -1 $mainheadid \
-			   -- $vfilelimit($view)] r]
-	set j [reg_instance $rfd]
-	lappend viewinstances($view) $j
-	fconfigure $rfd -blocking 0
-	filerun $rfd [list getviewhead $rfd $j $view]
-	set viewmainheadid($curview) {}
+        set rfd [open [concat | git rev-list -1 $mainheadid \
+                           -- $vfilelimit($view)] r]
+        set j [reg_instance $rfd]
+        lappend viewinstances($view) $j
+        fconfigure $rfd -blocking 0
+        filerun $rfd [list getviewhead $rfd $j $view]
+        set viewmainheadid($curview) {}
     }
 }
 
@@ -5254,21 +5272,21 @@ proc getviewhead {fd inst view} {
 
     set id {}
     if {[gets $fd line] < 0} {
-	if {![eof $fd]} {
-	    return 1
-	}
+        if {![eof $fd]} {
+            return 1
+        }
     } elseif {[string length $line] == 40 && [string is xdigit $line]} {
-	set id $line
+        set id $line
     }
     set viewmainheadid($view) $id
     close $fd
     unset commfd($inst)
     set i [lsearch -exact $viewinstances($view) $inst]
     if {$i >= 0} {
-	set viewinstances($view) [lreplace $viewinstances($view) $i $i]
+        set viewinstances($view) [lreplace $viewinstances($view) $i $i]
     }
     if {$showlocalchanges && $id ne {} && $view == $curview} {
-	doshowlocalchanges
+        doshowlocalchanges
     }
     return 0
 }
@@ -5278,9 +5296,9 @@ proc doshowlocalchanges {} {
 
     if {$viewmainheadid($curview) eq {}} return
     if {[commitinview $viewmainheadid($curview) $curview]} {
-	dodiffindex
+        dodiffindex
     } else {
-	interestedin $viewmainheadid($curview) dodiffindex
+        interestedin $viewmainheadid($curview) dodiffindex
     }
 }
 
@@ -5288,10 +5306,10 @@ proc dohidelocalchanges {} {
     global nullid nullid2 lserial curview
 
     if {[commitinview $nullid $curview]} {
-	removefakerow $nullid
+        removefakerow $nullid
     }
     if {[commitinview $nullid2 $curview]} {
-	removefakerow $nullid2
+        removefakerow $nullid2
     }
     incr lserial
 }
@@ -5304,12 +5322,12 @@ proc dodiffindex {} {
     if {!$showlocalchanges || !$hasworktree} return
     incr lserial
     if {[package vcompare $git_version "1.7.2"] >= 0} {
-	set cmd "|git diff-index --cached --ignore-submodules=dirty HEAD"
+        set cmd "|git diff-index --cached --ignore-submodules=dirty HEAD"
     } else {
-	set cmd "|git diff-index --cached HEAD"
+        set cmd "|git diff-index --cached HEAD"
     }
     if {$vfilelimit($curview) ne {}} {
-	set cmd [concat $cmd -- $vfilelimit($curview)]
+        set cmd [concat $cmd -- $vfilelimit($curview)]
     }
     set fd [open $cmd r]
     fconfigure $fd -blocking 0
@@ -5323,22 +5341,22 @@ proc readdiffindex {fd serial inst} {
 
     set isdiff 1
     if {[gets $fd line] < 0} {
-	if {![eof $fd]} {
-	    return 1
-	}
-	set isdiff 0
+        if {![eof $fd]} {
+            return 1
+        }
+        set isdiff 0
     }
     # we only need to see one line and we don't really care what it says...
     stop_instance $inst
 
     if {$serial != $lserial} {
-	return 0
+        return 0
     }
 
     # now see if there are any local changes not checked in to the index
     set cmd "|git diff-files"
     if {$vfilelimit($curview) ne {}} {
-	set cmd [concat $cmd -- $vfilelimit($curview)]
+        set cmd [concat $cmd -- $vfilelimit($curview)]
     }
     set fd [open $cmd r]
     fconfigure $fd -blocking 0
@@ -5346,19 +5364,19 @@ proc readdiffindex {fd serial inst} {
     filerun $fd [list readdifffiles $fd $serial $i]
 
     if {$isdiff && ![commitinview $nullid2 $curview]} {
-	# add the line for the changes in the index to the graph
-	set hl [mc "Local changes checked in to index but not committed"]
-	set commitinfo($nullid2) [list  $hl {} {} {} {} "    $hl\n"]
-	set commitdata($nullid2) "\n    $hl\n"
-	if {[commitinview $nullid $curview]} {
-	    removefakerow $nullid
-	}
-	insertfakerow $nullid2 $viewmainheadid($curview)
+        # add the line for the changes in the index to the graph
+        set hl [mc "Local changes checked in to index but not committed"]
+        set commitinfo($nullid2) [list  $hl {} {} {} {} "    $hl\n"]
+        set commitdata($nullid2) "\n    $hl\n"
+        if {[commitinview $nullid $curview]} {
+            removefakerow $nullid
+        }
+        insertfakerow $nullid2 $viewmainheadid($curview)
     } elseif {!$isdiff && [commitinview $nullid2 $curview]} {
-	if {[commitinview $nullid $curview]} {
-	    removefakerow $nullid
-	}
-	removefakerow $nullid2
+        if {[commitinview $nullid $curview]} {
+            removefakerow $nullid
+        }
+        removefakerow $nullid2
     }
     return 0
 }
@@ -5369,31 +5387,31 @@ proc readdifffiles {fd serial inst} {
 
     set isdiff 1
     if {[gets $fd line] < 0} {
-	if {![eof $fd]} {
-	    return 1
-	}
-	set isdiff 0
+        if {![eof $fd]} {
+            return 1
+        }
+        set isdiff 0
     }
     # we only need to see one line and we don't really care what it says...
     stop_instance $inst
 
     if {$serial != $lserial} {
-	return 0
+        return 0
     }
 
     if {$isdiff && ![commitinview $nullid $curview]} {
-	# add the line for the local diff to the graph
-	set hl [mc "Local uncommitted changes, not checked in to index"]
-	set commitinfo($nullid) [list  $hl {} {} {} {} "    $hl\n"]
-	set commitdata($nullid) "\n    $hl\n"
-	if {[commitinview $nullid2 $curview]} {
-	    set p $nullid2
-	} else {
-	    set p $viewmainheadid($curview)
-	}
-	insertfakerow $nullid $p
+        # add the line for the local diff to the graph
+        set hl [mc "Local uncommitted changes, not checked in to index"]
+        set commitinfo($nullid) [list  $hl {} {} {} {} "    $hl\n"]
+        set commitdata($nullid) "\n    $hl\n"
+        if {[commitinview $nullid2 $curview]} {
+            set p $nullid2
+        } else {
+            set p $viewmainheadid($curview)
+        }
+        insertfakerow $nullid $p
     } elseif {!$isdiff && [commitinview $nullid $curview]} {
-	removefakerow $nullid
+        removefakerow $nullid
     }
     return 0
 }
@@ -5402,17 +5420,17 @@ proc nextuse {id row} {
     global curview children
 
     if {[info exists children($curview,$id)]} {
-	foreach kid $children($curview,$id) {
-	    if {![commitinview $kid $curview]} {
-		return -1
-	    }
-	    if {[rowofcommit $kid] > $row} {
-		return [rowofcommit $kid]
-	    }
-	}
+        foreach kid $children($curview,$id) {
+            if {![commitinview $kid $curview]} {
+                return -1
+            }
+            if {[rowofcommit $kid] > $row} {
+                return [rowofcommit $kid]
+            }
+        }
     }
     if {[commitinview $id $curview]} {
-	return [rowofcommit $id]
+        return [rowofcommit $id]
     }
     return -1
 }
@@ -5422,12 +5440,12 @@ proc prevuse {id row} {
 
     set ret -1
     if {[info exists children($curview,$id)]} {
-	foreach kid $children($curview,$id) {
-	    if {![commitinview $kid $curview]} break
-	    if {[rowofcommit $kid] < $row} {
-		set ret [rowofcommit $kid]
-	    }
-	}
+        foreach kid $children($curview,$id) {
+            if {![commitinview $kid $curview]} break
+            if {[rowofcommit $kid] < $row} {
+                set ret [rowofcommit $kid]
+            }
+        }
     }
     return $ret
 }
@@ -5438,70 +5456,70 @@ proc make_idlist {row} {
 
     set r [expr {$row - $mingaplen - $downarrowlen - 1}]
     if {$r < 0} {
-	set r 0
+        set r 0
     }
     set ra [expr {$row - $downarrowlen}]
     if {$ra < 0} {
-	set ra 0
+        set ra 0
     }
     set rb [expr {$row + $uparrowlen}]
     if {$rb > $commitidx($curview)} {
-	set rb $commitidx($curview)
+        set rb $commitidx($curview)
     }
     make_disporder $r [expr {$rb + 1}]
     set ids {}
     for {} {$r < $ra} {incr r} {
-	set nextid [lindex $displayorder [expr {$r + 1}]]
-	foreach p [lindex $parentlist $r] {
-	    if {$p eq $nextid} continue
-	    set rn [nextuse $p $r]
-	    if {$rn >= $row &&
-		$rn <= $r + $downarrowlen + $mingaplen + $uparrowlen} {
-		lappend ids [list [ordertoken $p] $p]
-	    }
-	}
+        set nextid [lindex $displayorder [expr {$r + 1}]]
+        foreach p [lindex $parentlist $r] {
+            if {$p eq $nextid} continue
+            set rn [nextuse $p $r]
+            if {$rn >= $row &&
+                $rn <= $r + $downarrowlen + $mingaplen + $uparrowlen} {
+                lappend ids [list [ordertoken $p] $p]
+            }
+        }
     }
     for {} {$r < $row} {incr r} {
-	set nextid [lindex $displayorder [expr {$r + 1}]]
-	foreach p [lindex $parentlist $r] {
-	    if {$p eq $nextid} continue
-	    set rn [nextuse $p $r]
-	    if {$rn < 0 || $rn >= $row} {
-		lappend ids [list [ordertoken $p] $p]
-	    }
-	}
+        set nextid [lindex $displayorder [expr {$r + 1}]]
+        foreach p [lindex $parentlist $r] {
+            if {$p eq $nextid} continue
+            set rn [nextuse $p $r]
+            if {$rn < 0 || $rn >= $row} {
+                lappend ids [list [ordertoken $p] $p]
+            }
+        }
     }
     set id [lindex $displayorder $row]
     lappend ids [list [ordertoken $id] $id]
     while {$r < $rb} {
-	foreach p [lindex $parentlist $r] {
-	    set firstkid [lindex $children($curview,$p) 0]
-	    if {[rowofcommit $firstkid] < $row} {
-		lappend ids [list [ordertoken $p] $p]
-	    }
-	}
-	incr r
-	set id [lindex $displayorder $r]
-	if {$id ne {}} {
-	    set firstkid [lindex $children($curview,$id) 0]
-	    if {$firstkid ne {} && [rowofcommit $firstkid] < $row} {
-		lappend ids [list [ordertoken $id] $id]
-	    }
-	}
+        foreach p [lindex $parentlist $r] {
+            set firstkid [lindex $children($curview,$p) 0]
+            if {[rowofcommit $firstkid] < $row} {
+                lappend ids [list [ordertoken $p] $p]
+            }
+        }
+        incr r
+        set id [lindex $displayorder $r]
+        if {$id ne {}} {
+            set firstkid [lindex $children($curview,$id) 0]
+            if {$firstkid ne {} && [rowofcommit $firstkid] < $row} {
+                lappend ids [list [ordertoken $id] $id]
+            }
+        }
     }
     set idlist {}
     foreach idx [lsort -unique $ids] {
-	lappend idlist [lindex $idx 1]
+        lappend idlist [lindex $idx 1]
     }
     return $idlist
 }
 
 proc rowsequal {a b} {
     while {[set i [lsearch -exact $a {}]] >= 0} {
-	set a [lreplace $a $i $i]
+        set a [lreplace $a $i $i]
     }
     while {[set i [lsearch -exact $b {}]] >= 0} {
-	set b [lreplace $b $i $i]
+        set b [lreplace $b $i $i]
     }
     return [expr {$a eq $b}]
 }
@@ -5510,20 +5528,20 @@ proc makeupline {id row rend col} {
     global rowidlist uparrowlen downarrowlen mingaplen
 
     for {set r $rend} {1} {set r $rstart} {
-	set rstart [prevuse $id $r]
-	if {$rstart < 0} return
-	if {$rstart < $row} break
+        set rstart [prevuse $id $r]
+        if {$rstart < 0} return
+        if {$rstart < $row} break
     }
     if {$rstart + $uparrowlen + $mingaplen + $downarrowlen < $rend} {
-	set rstart [expr {$rend - $uparrowlen - 1}]
+        set rstart [expr {$rend - $uparrowlen - 1}]
     }
     for {set r $rstart} {[incr r] <= $row} {} {
-	set idlist [lindex $rowidlist $r]
-	if {$idlist ne {} && [lsearch -exact $idlist $id] < 0} {
-	    set col [idcol $idlist $id $col]
-	    lset rowidlist $r [linsert $idlist $col $id]
-	    changedrow $r
-	}
+        set idlist [lindex $rowidlist $r]
+        if {$idlist ne {} && [lsearch -exact $idlist $id] < 0} {
+            set col [idcol $idlist $id $col]
+            lset rowidlist $r [linsert $idlist $col $id]
+            changedrow $r
+        }
     }
 }
 
@@ -5536,100 +5554,100 @@ proc layoutrows {row endrow} {
     make_disporder [expr {$row - 1}] [expr {$endrow + $uparrowlen}]
     set idlist {}
     if {$row > 0} {
-	set rm1 [expr {$row - 1}]
-	foreach id [lindex $rowidlist $rm1] {
-	    if {$id ne {}} {
-		lappend idlist $id
-	    }
-	}
-	set final [lindex $rowfinal $rm1]
+        set rm1 [expr {$row - 1}]
+        foreach id [lindex $rowidlist $rm1] {
+            if {$id ne {}} {
+                lappend idlist $id
+            }
+        }
+        set final [lindex $rowfinal $rm1]
     }
     for {} {$row < $endrow} {incr row} {
-	set rm1 [expr {$row - 1}]
-	if {$rm1 < 0 || $idlist eq {}} {
-	    set idlist [make_idlist $row]
-	    set final 1
-	} else {
-	    set id [lindex $displayorder $rm1]
-	    set col [lsearch -exact $idlist $id]
-	    set idlist [lreplace $idlist $col $col]
-	    foreach p [lindex $parentlist $rm1] {
-		if {[lsearch -exact $idlist $p] < 0} {
-		    set col [idcol $idlist $p $col]
-		    set idlist [linsert $idlist $col $p]
-		    # if not the first child, we have to insert a line going up
-		    if {$id ne [lindex $children($curview,$p) 0]} {
-			makeupline $p $rm1 $row $col
-		    }
-		}
-	    }
-	    set id [lindex $displayorder $row]
-	    if {$row > $downarrowlen} {
-		set termrow [expr {$row - $downarrowlen - 1}]
-		foreach p [lindex $parentlist $termrow] {
-		    set i [lsearch -exact $idlist $p]
-		    if {$i < 0} continue
-		    set nr [nextuse $p $termrow]
-		    if {$nr < 0 || $nr >= $row + $mingaplen + $uparrowlen} {
-			set idlist [lreplace $idlist $i $i]
-		    }
-		}
-	    }
-	    set col [lsearch -exact $idlist $id]
-	    if {$col < 0} {
-		set col [idcol $idlist $id]
-		set idlist [linsert $idlist $col $id]
-		if {$children($curview,$id) ne {}} {
-		    makeupline $id $rm1 $row $col
-		}
-	    }
-	    set r [expr {$row + $uparrowlen - 1}]
-	    if {$r < $commitidx($curview)} {
-		set x $col
-		foreach p [lindex $parentlist $r] {
-		    if {[lsearch -exact $idlist $p] >= 0} continue
-		    set fk [lindex $children($curview,$p) 0]
-		    if {[rowofcommit $fk] < $row} {
-			set x [idcol $idlist $p $x]
-			set idlist [linsert $idlist $x $p]
-		    }
-		}
-		if {[incr r] < $commitidx($curview)} {
-		    set p [lindex $displayorder $r]
-		    if {[lsearch -exact $idlist $p] < 0} {
-			set fk [lindex $children($curview,$p) 0]
-			if {$fk ne {} && [rowofcommit $fk] < $row} {
-			    set x [idcol $idlist $p $x]
-			    set idlist [linsert $idlist $x $p]
-			}
-		    }
-		}
-	    }
-	}
-	if {$final && !$viewcomplete($curview) &&
-	    $row + $uparrowlen + $mingaplen + $downarrowlen
-		>= $commitidx($curview)} {
-	    set final 0
-	}
-	set l [llength $rowidlist]
-	if {$row == $l} {
-	    lappend rowidlist $idlist
-	    lappend rowisopt 0
-	    lappend rowfinal $final
-	} elseif {$row < $l} {
-	    if {![rowsequal $idlist [lindex $rowidlist $row]]} {
-		lset rowidlist $row $idlist
-		changedrow $row
-	    }
-	    lset rowfinal $row $final
-	} else {
-	    set pad [ntimes [expr {$row - $l}] {}]
-	    set rowidlist [concat $rowidlist $pad]
-	    lappend rowidlist $idlist
-	    set rowfinal [concat $rowfinal $pad]
-	    lappend rowfinal $final
-	    set rowisopt [concat $rowisopt [ntimes [expr {$row - $l + 1}] 0]]
-	}
+        set rm1 [expr {$row - 1}]
+        if {$rm1 < 0 || $idlist eq {}} {
+            set idlist [make_idlist $row]
+            set final 1
+        } else {
+            set id [lindex $displayorder $rm1]
+            set col [lsearch -exact $idlist $id]
+            set idlist [lreplace $idlist $col $col]
+            foreach p [lindex $parentlist $rm1] {
+                if {[lsearch -exact $idlist $p] < 0} {
+                    set col [idcol $idlist $p $col]
+                    set idlist [linsert $idlist $col $p]
+                    # if not the first child, we have to insert a line going up
+                    if {$id ne [lindex $children($curview,$p) 0]} {
+                        makeupline $p $rm1 $row $col
+                    }
+                }
+            }
+            set id [lindex $displayorder $row]
+            if {$row > $downarrowlen} {
+                set termrow [expr {$row - $downarrowlen - 1}]
+                foreach p [lindex $parentlist $termrow] {
+                    set i [lsearch -exact $idlist $p]
+                    if {$i < 0} continue
+                    set nr [nextuse $p $termrow]
+                    if {$nr < 0 || $nr >= $row + $mingaplen + $uparrowlen} {
+                        set idlist [lreplace $idlist $i $i]
+                    }
+                }
+            }
+            set col [lsearch -exact $idlist $id]
+            if {$col < 0} {
+                set col [idcol $idlist $id]
+                set idlist [linsert $idlist $col $id]
+                if {$children($curview,$id) ne {}} {
+                    makeupline $id $rm1 $row $col
+                }
+            }
+            set r [expr {$row + $uparrowlen - 1}]
+            if {$r < $commitidx($curview)} {
+                set x $col
+                foreach p [lindex $parentlist $r] {
+                    if {[lsearch -exact $idlist $p] >= 0} continue
+                    set fk [lindex $children($curview,$p) 0]
+                    if {[rowofcommit $fk] < $row} {
+                        set x [idcol $idlist $p $x]
+                        set idlist [linsert $idlist $x $p]
+                    }
+                }
+                if {[incr r] < $commitidx($curview)} {
+                    set p [lindex $displayorder $r]
+                    if {[lsearch -exact $idlist $p] < 0} {
+                        set fk [lindex $children($curview,$p) 0]
+                        if {$fk ne {} && [rowofcommit $fk] < $row} {
+                            set x [idcol $idlist $p $x]
+                            set idlist [linsert $idlist $x $p]
+                        }
+                    }
+                }
+            }
+        }
+        if {$final && !$viewcomplete($curview) &&
+            $row + $uparrowlen + $mingaplen + $downarrowlen
+                >= $commitidx($curview)} {
+            set final 0
+        }
+        set l [llength $rowidlist]
+        if {$row == $l} {
+            lappend rowidlist $idlist
+            lappend rowisopt 0
+            lappend rowfinal $final
+        } elseif {$row < $l} {
+            if {![rowsequal $idlist [lindex $rowidlist $row]]} {
+                lset rowidlist $row $idlist
+                changedrow $row
+            }
+            lset rowfinal $row $final
+        } else {
+            set pad [ntimes [expr {$row - $l}] {}]
+            set rowidlist [concat $rowidlist $pad]
+            lappend rowidlist $idlist
+            set rowfinal [concat $rowfinal $pad]
+            lappend rowfinal $final
+            set rowisopt [concat $rowisopt [ntimes [expr {$row - $l + 1}] 0]]
+        }
     }
     return $row
 }
@@ -5639,17 +5657,17 @@ proc changedrow {row} {
 
     set l [llength $rowisopt]
     if {$row < $l} {
-	lset rowisopt $row 0
-	if {$row + 1 < $l} {
-	    lset rowisopt [expr {$row + 1}] 0
-	    if {$row + 2 < $l} {
-		lset rowisopt [expr {$row + 2}] 0
-	    }
-	}
+        lset rowisopt $row 0
+        if {$row + 1 < $l} {
+            lset rowisopt [expr {$row + 1}] 0
+            if {$row + 2 < $l} {
+                lset rowisopt [expr {$row + 2}] 0
+            }
+        }
     }
     set id [lindex $displayorder $row]
     if {[info exists iddrawn($id)]} {
-	set need_redisplay 1
+        set need_redisplay 1
     }
 }
 
@@ -5662,7 +5680,7 @@ proc insert_pad {row col npad} {
     set aft [lrange $idlist $col end]
     set i [lsearch -exact $aft {}]
     if {$i > 0} {
-	set aft [lreplace $aft $i $i]
+        set aft [lreplace $aft $i $i]
     }
     lset rowidlist $row [concat $bef $pad $aft]
     changedrow $row
@@ -5672,123 +5690,123 @@ proc optimize_rows {row col endrow} {
     global rowidlist rowisopt displayorder curview children
 
     if {$row < 1} {
-	set row 1
+        set row 1
     }
     for {} {$row < $endrow} {incr row; set col 0} {
-	if {[lindex $rowisopt $row]} continue
-	set haspad 0
-	set y0 [expr {$row - 1}]
-	set ym [expr {$row - 2}]
-	set idlist [lindex $rowidlist $row]
-	set previdlist [lindex $rowidlist $y0]
-	if {$idlist eq {} || $previdlist eq {}} continue
-	if {$ym >= 0} {
-	    set pprevidlist [lindex $rowidlist $ym]
-	    if {$pprevidlist eq {}} continue
-	} else {
-	    set pprevidlist {}
-	}
-	set x0 -1
-	set xm -1
-	for {} {$col < [llength $idlist]} {incr col} {
-	    set id [lindex $idlist $col]
-	    if {[lindex $previdlist $col] eq $id} continue
-	    if {$id eq {}} {
-		set haspad 1
-		continue
-	    }
-	    set x0 [lsearch -exact $previdlist $id]
-	    if {$x0 < 0} continue
-	    set z [expr {$x0 - $col}]
-	    set isarrow 0
-	    set z0 {}
-	    if {$ym >= 0} {
-		set xm [lsearch -exact $pprevidlist $id]
-		if {$xm >= 0} {
-		    set z0 [expr {$xm - $x0}]
-		}
-	    }
-	    if {$z0 eq {}} {
-		# if row y0 is the first child of $id then it's not an arrow
-		if {[lindex $children($curview,$id) 0] ne
-		    [lindex $displayorder $y0]} {
-		    set isarrow 1
-		}
-	    }
-	    if {!$isarrow && $id ne [lindex $displayorder $row] &&
-		[lsearch -exact [lindex $rowidlist [expr {$row+1}]] $id] < 0} {
-		set isarrow 1
-	    }
-	    # Looking at lines from this row to the previous row,
-	    # make them go straight up if they end in an arrow on
-	    # the previous row; otherwise make them go straight up
-	    # or at 45 degrees.
-	    if {$z < -1 || ($z < 0 && $isarrow)} {
-		# Line currently goes left too much;
-		# insert pads in the previous row, then optimize it
-		set npad [expr {-1 - $z + $isarrow}]
-		insert_pad $y0 $x0 $npad
-		if {$y0 > 0} {
-		    optimize_rows $y0 $x0 $row
-		}
-		set previdlist [lindex $rowidlist $y0]
-		set x0 [lsearch -exact $previdlist $id]
-		set z [expr {$x0 - $col}]
-		if {$z0 ne {}} {
-		    set pprevidlist [lindex $rowidlist $ym]
-		    set xm [lsearch -exact $pprevidlist $id]
-		    set z0 [expr {$xm - $x0}]
-		}
-	    } elseif {$z > 1 || ($z > 0 && $isarrow)} {
-		# Line currently goes right too much;
-		# insert pads in this line
-		set npad [expr {$z - 1 + $isarrow}]
-		insert_pad $row $col $npad
-		set idlist [lindex $rowidlist $row]
-		incr col $npad
-		set z [expr {$x0 - $col}]
-		set haspad 1
-	    }
-	    if {$z0 eq {} && !$isarrow && $ym >= 0} {
-		# this line links to its first child on row $row-2
-		set id [lindex $displayorder $ym]
-		set xc [lsearch -exact $pprevidlist $id]
-		if {$xc >= 0} {
-		    set z0 [expr {$xc - $x0}]
-		}
-	    }
-	    # avoid lines jigging left then immediately right
-	    if {$z0 ne {} && $z < 0 && $z0 > 0} {
-		insert_pad $y0 $x0 1
-		incr x0
-		optimize_rows $y0 $x0 $row
-		set previdlist [lindex $rowidlist $y0]
-	    }
-	}
-	if {!$haspad} {
-	    # Find the first column that doesn't have a line going right
-	    for {set col [llength $idlist]} {[incr col -1] >= 0} {} {
-		set id [lindex $idlist $col]
-		if {$id eq {}} break
-		set x0 [lsearch -exact $previdlist $id]
-		if {$x0 < 0} {
-		    # check if this is the link to the first child
-		    set kid [lindex $displayorder $y0]
-		    if {[lindex $children($curview,$id) 0] eq $kid} {
-			# it is, work out offset to child
-			set x0 [lsearch -exact $previdlist $kid]
-		    }
-		}
-		if {$x0 <= $col} break
-	    }
-	    # Insert a pad at that column as long as it has a line and
-	    # isn't the last column
-	    if {$x0 >= 0 && [incr col] < [llength $idlist]} {
-		set idlist [linsert $idlist $col {}]
-		lset rowidlist $row $idlist
-		changedrow $row
-	    }
-	}
+        if {[lindex $rowisopt $row]} continue
+        set haspad 0
+        set y0 [expr {$row - 1}]
+        set ym [expr {$row - 2}]
+        set idlist [lindex $rowidlist $row]
+        set previdlist [lindex $rowidlist $y0]
+        if {$idlist eq {} || $previdlist eq {}} continue
+        if {$ym >= 0} {
+            set pprevidlist [lindex $rowidlist $ym]
+            if {$pprevidlist eq {}} continue
+        } else {
+            set pprevidlist {}
+        }
+        set x0 -1
+        set xm -1
+        for {} {$col < [llength $idlist]} {incr col} {
+            set id [lindex $idlist $col]
+            if {[lindex $previdlist $col] eq $id} continue
+            if {$id eq {}} {
+                set haspad 1
+                continue
+            }
+            set x0 [lsearch -exact $previdlist $id]
+            if {$x0 < 0} continue
+            set z [expr {$x0 - $col}]
+            set isarrow 0
+            set z0 {}
+            if {$ym >= 0} {
+                set xm [lsearch -exact $pprevidlist $id]
+                if {$xm >= 0} {
+                    set z0 [expr {$xm - $x0}]
+                }
+            }
+            if {$z0 eq {}} {
+                # if row y0 is the first child of $id then it's not an arrow
+                if {[lindex $children($curview,$id) 0] ne
+                    [lindex $displayorder $y0]} {
+                    set isarrow 1
+                }
+            }
+            if {!$isarrow && $id ne [lindex $displayorder $row] &&
+                [lsearch -exact [lindex $rowidlist [expr {$row+1}]] $id] < 0} {
+                set isarrow 1
+            }
+            # Looking at lines from this row to the previous row,
+            # make them go straight up if they end in an arrow on
+            # the previous row; otherwise make them go straight up
+            # or at 45 degrees.
+            if {$z < -1 || ($z < 0 && $isarrow)} {
+                # Line currently goes left too much;
+                # insert pads in the previous row, then optimize it
+                set npad [expr {-1 - $z + $isarrow}]
+                insert_pad $y0 $x0 $npad
+                if {$y0 > 0} {
+                    optimize_rows $y0 $x0 $row
+                }
+                set previdlist [lindex $rowidlist $y0]
+                set x0 [lsearch -exact $previdlist $id]
+                set z [expr {$x0 - $col}]
+                if {$z0 ne {}} {
+                    set pprevidlist [lindex $rowidlist $ym]
+                    set xm [lsearch -exact $pprevidlist $id]
+                    set z0 [expr {$xm - $x0}]
+                }
+            } elseif {$z > 1 || ($z > 0 && $isarrow)} {
+                # Line currently goes right too much;
+                # insert pads in this line
+                set npad [expr {$z - 1 + $isarrow}]
+                insert_pad $row $col $npad
+                set idlist [lindex $rowidlist $row]
+                incr col $npad
+                set z [expr {$x0 - $col}]
+                set haspad 1
+            }
+            if {$z0 eq {} && !$isarrow && $ym >= 0} {
+                # this line links to its first child on row $row-2
+                set id [lindex $displayorder $ym]
+                set xc [lsearch -exact $pprevidlist $id]
+                if {$xc >= 0} {
+                    set z0 [expr {$xc - $x0}]
+                }
+            }
+            # avoid lines jigging left then immediately right
+            if {$z0 ne {} && $z < 0 && $z0 > 0} {
+                insert_pad $y0 $x0 1
+                incr x0
+                optimize_rows $y0 $x0 $row
+                set previdlist [lindex $rowidlist $y0]
+            }
+        }
+        if {!$haspad} {
+            # Find the first column that doesn't have a line going right
+            for {set col [llength $idlist]} {[incr col -1] >= 0} {} {
+                set id [lindex $idlist $col]
+                if {$id eq {}} break
+                set x0 [lsearch -exact $previdlist $id]
+                if {$x0 < 0} {
+                    # check if this is the link to the first child
+                    set kid [lindex $displayorder $y0]
+                    if {[lindex $children($curview,$id) 0] eq $kid} {
+                        # it is, work out offset to child
+                        set x0 [lsearch -exact $previdlist $kid]
+                    }
+                }
+                if {$x0 <= $col} break
+            }
+            # Insert a pad at that column as long as it has a line and
+            # isn't the last column
+            if {$x0 >= 0 && [incr col] < [llength $idlist]} {
+                set idlist [linsert $idlist $col {}]
+                lset rowidlist $row $idlist
+                changedrow $row
+            }
+        }
     }
 }
 
@@ -5807,7 +5825,7 @@ proc linewidth {id} {
 
     set wid $lthickness
     if {[info exists thickerline] && $id eq $thickerline} {
-	set wid [expr {2 * $lthickness}]
+        set wid [expr {2 * $lthickness}]
     }
     return $wid
 }
@@ -5818,52 +5836,52 @@ proc rowranges {id} {
 
     set kids $children($curview,$id)
     if {$kids eq {}} {
-	return {}
+        return {}
     }
     set ret {}
     lappend kids $id
     foreach child $kids {
-	if {![commitinview $child $curview]} break
-	set row [rowofcommit $child]
-	if {![info exists prev]} {
-	    lappend ret [expr {$row + 1}]
-	} else {
-	    if {$row <= $prevrow} {
-		puts "oops children of [shortids $id] out of order [shortids $child] $row <= [shortids $prev] $prevrow"
-	    }
-	    # see if the line extends the whole way from prevrow to row
-	    if {$row > $prevrow + $uparrowlen + $downarrowlen &&
-		[lsearch -exact [lindex $rowidlist \
-			    [expr {int(($row + $prevrow) / 2)}]] $id] < 0} {
-		# it doesn't, see where it ends
-		set r [expr {$prevrow + $downarrowlen}]
-		if {[lsearch -exact [lindex $rowidlist $r] $id] < 0} {
-		    while {[incr r -1] > $prevrow &&
-			   [lsearch -exact [lindex $rowidlist $r] $id] < 0} {}
-		} else {
-		    while {[incr r] <= $row &&
-			   [lsearch -exact [lindex $rowidlist $r] $id] >= 0} {}
-		    incr r -1
-		}
-		lappend ret $r
-		# see where it starts up again
-		set r [expr {$row - $uparrowlen}]
-		if {[lsearch -exact [lindex $rowidlist $r] $id] < 0} {
-		    while {[incr r] < $row &&
-			   [lsearch -exact [lindex $rowidlist $r] $id] < 0} {}
-		} else {
-		    while {[incr r -1] >= $prevrow &&
-			   [lsearch -exact [lindex $rowidlist $r] $id] >= 0} {}
-		    incr r
-		}
-		lappend ret $r
-	    }
-	}
-	if {$child eq $id} {
-	    lappend ret $row
-	}
-	set prev $child
-	set prevrow $row
+        if {![commitinview $child $curview]} break
+        set row [rowofcommit $child]
+        if {![info exists prev]} {
+            lappend ret [expr {$row + 1}]
+        } else {
+            if {$row <= $prevrow} {
+                puts "oops children of [shortids $id] out of order [shortids $child] $row <= [shortids $prev] $prevrow"
+            }
+            # see if the line extends the whole way from prevrow to row
+            if {$row > $prevrow + $uparrowlen + $downarrowlen &&
+                [lsearch -exact [lindex $rowidlist \
+                            [expr {int(($row + $prevrow) / 2)}]] $id] < 0} {
+                # it doesn't, see where it ends
+                set r [expr {$prevrow + $downarrowlen}]
+                if {[lsearch -exact [lindex $rowidlist $r] $id] < 0} {
+                    while {[incr r -1] > $prevrow &&
+                           [lsearch -exact [lindex $rowidlist $r] $id] < 0} {}
+                } else {
+                    while {[incr r] <= $row &&
+                           [lsearch -exact [lindex $rowidlist $r] $id] >= 0} {}
+                    incr r -1
+                }
+                lappend ret $r
+                # see where it starts up again
+                set r [expr {$row - $uparrowlen}]
+                if {[lsearch -exact [lindex $rowidlist $r] $id] < 0} {
+                    while {[incr r] < $row &&
+                           [lsearch -exact [lindex $rowidlist $r] $id] < 0} {}
+                } else {
+                    while {[incr r -1] >= $prevrow &&
+                           [lsearch -exact [lindex $rowidlist $r] $id] >= 0} {}
+                    incr r
+                }
+                lappend ret $r
+            }
+        }
+        if {$child eq $id} {
+            lappend ret $row
+        }
+        set prev $child
+        set prevrow $row
     }
     return $ret
 }
@@ -5876,158 +5894,158 @@ proc drawlineseg {id row endrow arrowlow} {
     set le [expr {$row + 1}]
     set arrowhigh 1
     while {1} {
-	set c [lsearch -exact [lindex $rowidlist $le] $id]
-	if {$c < 0} {
-	    incr le -1
-	    break
-	}
-	lappend cols $c
-	set x [lindex $displayorder $le]
-	if {$x eq $id} {
-	    set arrowhigh 0
-	    break
-	}
-	if {[info exists iddrawn($x)] || $le == $endrow} {
-	    set c [lsearch -exact [lindex $rowidlist [expr {$le+1}]] $id]
-	    if {$c >= 0} {
-		lappend cols $c
-		set arrowhigh 0
-	    }
-	    break
-	}
-	incr le
+        set c [lsearch -exact [lindex $rowidlist $le] $id]
+        if {$c < 0} {
+            incr le -1
+            break
+        }
+        lappend cols $c
+        set x [lindex $displayorder $le]
+        if {$x eq $id} {
+            set arrowhigh 0
+            break
+        }
+        if {[info exists iddrawn($x)] || $le == $endrow} {
+            set c [lsearch -exact [lindex $rowidlist [expr {$le+1}]] $id]
+            if {$c >= 0} {
+                lappend cols $c
+                set arrowhigh 0
+            }
+            break
+        }
+        incr le
     }
     if {$le <= $row} {
-	return $row
+        return $row
     }
 
     set lines {}
     set i 0
     set joinhigh 0
     if {[info exists linesegs($id)]} {
-	set lines $linesegs($id)
-	foreach li $lines {
-	    set r0 [lindex $li 0]
-	    if {$r0 > $row} {
-		if {$r0 == $le && [lindex $li 1] - $row <= $maxlinelen} {
-		    set joinhigh 1
-		}
-		break
-	    }
-	    incr i
-	}
+        set lines $linesegs($id)
+        foreach li $lines {
+            set r0 [lindex $li 0]
+            if {$r0 > $row} {
+                if {$r0 == $le && [lindex $li 1] - $row <= $maxlinelen} {
+                    set joinhigh 1
+                }
+                break
+            }
+            incr i
+        }
     }
     set joinlow 0
     if {$i > 0} {
-	set li [lindex $lines [expr {$i-1}]]
-	set r1 [lindex $li 1]
-	if {$r1 == $row && $le - [lindex $li 0] <= $maxlinelen} {
-	    set joinlow 1
-	}
+        set li [lindex $lines [expr {$i-1}]]
+        set r1 [lindex $li 1]
+        if {$r1 == $row && $le - [lindex $li 0] <= $maxlinelen} {
+            set joinlow 1
+        }
     }
 
     set x [lindex $cols [expr {$le - $row}]]
     set xp [lindex $cols [expr {$le - 1 - $row}]]
     set dir [expr {$xp - $x}]
     if {$joinhigh} {
-	set ith [lindex $lines $i 2]
-	set coords [$canv coords $ith]
-	set ah [$canv itemcget $ith -arrow]
-	set arrowhigh [expr {$ah eq "first" || $ah eq "both"}]
-	set x2 [lindex $cols [expr {$le + 1 - $row}]]
-	if {$x2 ne {} && $x - $x2 == $dir} {
-	    set coords [lrange $coords 0 end-2]
-	}
+        set ith [lindex $lines $i 2]
+        set coords [$canv coords $ith]
+        set ah [$canv itemcget $ith -arrow]
+        set arrowhigh [expr {$ah eq "first" || $ah eq "both"}]
+        set x2 [lindex $cols [expr {$le + 1 - $row}]]
+        if {$x2 ne {} && $x - $x2 == $dir} {
+            set coords [lrange $coords 0 end-2]
+        }
     } else {
-	set coords [list [xc $le $x] [yc $le]]
+        set coords [list [xc $le $x] [yc $le]]
     }
     if {$joinlow} {
-	set itl [lindex $lines [expr {$i-1}] 2]
-	set al [$canv itemcget $itl -arrow]
-	set arrowlow [expr {$al eq "last" || $al eq "both"}]
+        set itl [lindex $lines [expr {$i-1}] 2]
+        set al [$canv itemcget $itl -arrow]
+        set arrowlow [expr {$al eq "last" || $al eq "both"}]
     } elseif {$arrowlow} {
-	if {[lsearch -exact [lindex $rowidlist [expr {$row-1}]] $id] >= 0 ||
-	    [lsearch -exact [lindex $parentlist [expr {$row-1}]] $id] >= 0} {
-	    set arrowlow 0
-	}
+        if {[lsearch -exact [lindex $rowidlist [expr {$row-1}]] $id] >= 0 ||
+            [lsearch -exact [lindex $parentlist [expr {$row-1}]] $id] >= 0} {
+            set arrowlow 0
+        }
     }
     set arrow [lindex {none first last both} [expr {$arrowhigh + 2*$arrowlow}]]
     for {set y $le} {[incr y -1] > $row} {} {
-	set x $xp
-	set xp [lindex $cols [expr {$y - 1 - $row}]]
-	set ndir [expr {$xp - $x}]
-	if {$dir != $ndir || $xp < 0} {
-	    lappend coords [xc $y $x] [yc $y]
-	}
-	set dir $ndir
+        set x $xp
+        set xp [lindex $cols [expr {$y - 1 - $row}]]
+        set ndir [expr {$xp - $x}]
+        if {$dir != $ndir || $xp < 0} {
+            lappend coords [xc $y $x] [yc $y]
+        }
+        set dir $ndir
     }
     if {!$joinlow} {
-	if {$xp < 0} {
-	    # join parent line to first child
-	    set ch [lindex $displayorder $row]
-	    set xc [lsearch -exact [lindex $rowidlist $row] $ch]
-	    if {$xc < 0} {
-		puts "oops: drawlineseg: child $ch not on row $row"
-	    } elseif {$xc != $x} {
-		if {($arrowhigh && $le == $row + 1) || $dir == 0} {
-		    set d [expr {int(0.5 * $linespc)}]
-		    set x1 [xc $row $x]
-		    if {$xc < $x} {
-			set x2 [expr {$x1 - $d}]
-		    } else {
-			set x2 [expr {$x1 + $d}]
-		    }
-		    set y2 [yc $row]
-		    set y1 [expr {$y2 + $d}]
-		    lappend coords $x1 $y1 $x2 $y2
-		} elseif {$xc < $x - 1} {
-		    lappend coords [xc $row [expr {$x-1}]] [yc $row]
-		} elseif {$xc > $x + 1} {
-		    lappend coords [xc $row [expr {$x+1}]] [yc $row]
-		}
-		set x $xc
-	    }
-	    lappend coords [xc $row $x] [yc $row]
-	} else {
-	    set xn [xc $row $xp]
-	    set yn [yc $row]
-	    lappend coords $xn $yn
-	}
-	if {!$joinhigh} {
-	    assigncolor $id
-	    set t [$canv create line $coords -width [linewidth $id] \
-		       -fill $colormap($id) -tags lines.$id -arrow $arrow]
-	    $canv lower $t
-	    bindline $t $id
-	    set lines [linsert $lines $i [list $row $le $t]]
-	} else {
-	    $canv coords $ith $coords
-	    if {$arrow ne $ah} {
-		$canv itemconf $ith -arrow $arrow
-	    }
-	    lset lines $i 0 $row
-	}
+        if {$xp < 0} {
+            # join parent line to first child
+            set ch [lindex $displayorder $row]
+            set xc [lsearch -exact [lindex $rowidlist $row] $ch]
+            if {$xc < 0} {
+                puts "oops: drawlineseg: child $ch not on row $row"
+            } elseif {$xc != $x} {
+                if {($arrowhigh && $le == $row + 1) || $dir == 0} {
+                    set d [expr {int(0.5 * $linespc)}]
+                    set x1 [xc $row $x]
+                    if {$xc < $x} {
+                        set x2 [expr {$x1 - $d}]
+                    } else {
+                        set x2 [expr {$x1 + $d}]
+                    }
+                    set y2 [yc $row]
+                    set y1 [expr {$y2 + $d}]
+                    lappend coords $x1 $y1 $x2 $y2
+                } elseif {$xc < $x - 1} {
+                    lappend coords [xc $row [expr {$x-1}]] [yc $row]
+                } elseif {$xc > $x + 1} {
+                    lappend coords [xc $row [expr {$x+1}]] [yc $row]
+                }
+                set x $xc
+            }
+            lappend coords [xc $row $x] [yc $row]
+        } else {
+            set xn [xc $row $xp]
+            set yn [yc $row]
+            lappend coords $xn $yn
+        }
+        if {!$joinhigh} {
+            assigncolor $id
+            set t [$canv create line $coords -width [linewidth $id] \
+                       -fill $colormap($id) -tags lines.$id -arrow $arrow]
+            $canv lower $t
+            bindline $t $id
+            set lines [linsert $lines $i [list $row $le $t]]
+        } else {
+            $canv coords $ith $coords
+            if {$arrow ne $ah} {
+                $canv itemconf $ith -arrow $arrow
+            }
+            lset lines $i 0 $row
+        }
     } else {
-	set xo [lsearch -exact [lindex $rowidlist [expr {$row - 1}]] $id]
-	set ndir [expr {$xo - $xp}]
-	set clow [$canv coords $itl]
-	if {$dir == $ndir} {
-	    set clow [lrange $clow 2 end]
-	}
-	set coords [concat $coords $clow]
-	if {!$joinhigh} {
-	    lset lines [expr {$i-1}] 1 $le
-	} else {
-	    # coalesce two pieces
-	    $canv delete $ith
-	    set b [lindex $lines [expr {$i-1}] 0]
-	    set e [lindex $lines $i 1]
-	    set lines [lreplace $lines [expr {$i-1}] $i [list $b $e $itl]]
-	}
-	$canv coords $itl $coords
-	if {$arrow ne $al} {
-	    $canv itemconf $itl -arrow $arrow
-	}
+        set xo [lsearch -exact [lindex $rowidlist [expr {$row - 1}]] $id]
+        set ndir [expr {$xo - $xp}]
+        set clow [$canv coords $itl]
+        if {$dir == $ndir} {
+            set clow [lrange $clow 2 end]
+        }
+        set coords [concat $coords $clow]
+        if {!$joinhigh} {
+            lset lines [expr {$i-1}] 1 $le
+        } else {
+            # coalesce two pieces
+            $canv delete $ith
+            set b [lindex $lines [expr {$i-1}] 0]
+            set e [lindex $lines $i 1]
+            set lines [lreplace $lines [expr {$i-1}] $i [list $b $e $itl]]
+        }
+        $canv coords $itl $coords
+        if {$arrow ne $al} {
+            $canv itemconf $itl -arrow $arrow
+        }
     }
 
     set linesegs($id) $lines
@@ -6052,54 +6070,54 @@ proc drawparentlinks {id row} {
     # rmx = right-most X coord used
     set rmx 0
     foreach p $olds {
-	set i [lsearch -exact $ids $p]
-	if {$i < 0} {
-	    puts "oops, parent $p of $id not in list"
-	    continue
-	}
-	set x2 [xc $row2 $i]
-	if {$x2 > $rmx} {
-	    set rmx $x2
-	}
-	set j [lsearch -exact $rowids $p]
-	if {$j < 0} {
-	    # drawlineseg will do this one for us
-	    continue
-	}
-	assigncolor $p
-	# should handle duplicated parents here...
-	set coords [list $x $y]
-	if {$i != $col} {
-	    # if attaching to a vertical segment, draw a smaller
-	    # slant for visual distinctness
-	    if {$i == $j} {
-		if {$i < $col} {
-		    lappend coords [expr {$x2 + $d}] $y $x2 $ymid
-		} else {
-		    lappend coords [expr {$x2 - $d}] $y $x2 $ymid
-		}
-	    } elseif {$i < $col && $i < $j} {
-		# segment slants towards us already
-		lappend coords [xc $row $j] $y
-	    } else {
-		if {$i < $col - 1} {
-		    lappend coords [expr {$x2 + $linespc}] $y
-		} elseif {$i > $col + 1} {
-		    lappend coords [expr {$x2 - $linespc}] $y
-		}
-		lappend coords $x2 $y2
-	    }
-	} else {
-	    lappend coords $x2 $y2
-	}
-	set t [$canv create line $coords -width [linewidth $p] \
-		   -fill $colormap($p) -tags lines.$p]
-	$canv lower $t
-	bindline $t $p
+        set i [lsearch -exact $ids $p]
+        if {$i < 0} {
+            puts "oops, parent $p of $id not in list"
+            continue
+        }
+        set x2 [xc $row2 $i]
+        if {$x2 > $rmx} {
+            set rmx $x2
+        }
+        set j [lsearch -exact $rowids $p]
+        if {$j < 0} {
+            # drawlineseg will do this one for us
+            continue
+        }
+        assigncolor $p
+        # should handle duplicated parents here...
+        set coords [list $x $y]
+        if {$i != $col} {
+            # if attaching to a vertical segment, draw a smaller
+            # slant for visual distinctness
+            if {$i == $j} {
+                if {$i < $col} {
+                    lappend coords [expr {$x2 + $d}] $y $x2 $ymid
+                } else {
+                    lappend coords [expr {$x2 - $d}] $y $x2 $ymid
+                }
+            } elseif {$i < $col && $i < $j} {
+                # segment slants towards us already
+                lappend coords [xc $row $j] $y
+            } else {
+                if {$i < $col - 1} {
+                    lappend coords [expr {$x2 + $linespc}] $y
+                } elseif {$i > $col + 1} {
+                    lappend coords [expr {$x2 - $linespc}] $y
+                }
+                lappend coords $x2 $y2
+            }
+        } else {
+            lappend coords $x2 $y2
+        }
+        set t [$canv create line $coords -width [linewidth $p] \
+                   -fill $colormap($p) -tags lines.$p]
+        $canv lower $t
+        bindline $t $p
     }
     if {$rmx > [lindex $idpos($id) 1]} {
-	lset idpos($id) 1 $rmx
-	redrawtags $id
+        lset idpos($id) 1 $rmx
+        redrawtags $id
     }
 }
 
@@ -6122,35 +6140,35 @@ proc drawcmittext {id row col} {
     # listed is 0 for boundary, 1 for normal, 2 for negative, 3 for left, 4 for right
     set listed $cmitlisted($curview,$id)
     if {$id eq $nullid} {
-	set ofill $workingfilescirclecolor
+        set ofill $workingfilescirclecolor
     } elseif {$id eq $nullid2} {
-	set ofill $indexcirclecolor
+        set ofill $indexcirclecolor
     } elseif {$id eq $mainheadid} {
-	set ofill $mainheadcirclecolor
+        set ofill $mainheadcirclecolor
     } else {
-	set ofill [lindex $circlecolors $listed]
+        set ofill [lindex $circlecolors $listed]
     }
     set x [xc $row $col]
     set y [yc $row]
     set orad [expr {$linespc / 3}]
     if {$listed <= 2} {
-	set t [$canv create oval [expr {$x - $orad}] [expr {$y - $orad}] \
-		   [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
-		   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
+        set t [$canv create oval [expr {$x - $orad}] [expr {$y - $orad}] \
+                   [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
+                   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
     } elseif {$listed == 3} {
-	# triangle pointing left for left-side commits
-	set t [$canv create polygon \
-		   [expr {$x - $orad}] $y \
-		   [expr {$x + $orad - 1}] [expr {$y - $orad}] \
-		   [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
-		   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
+        # triangle pointing left for left-side commits
+        set t [$canv create polygon \
+                   [expr {$x - $orad}] $y \
+                   [expr {$x + $orad - 1}] [expr {$y - $orad}] \
+                   [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
+                   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
     } else {
-	# triangle pointing right for right-side commits
-	set t [$canv create polygon \
-		   [expr {$x + $orad - 1}] $y \
-		   [expr {$x - $orad}] [expr {$y - $orad}] \
-		   [expr {$x - $orad}] [expr {$y + $orad - 1}] \
-		   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
+        # triangle pointing right for right-side commits
+        set t [$canv create polygon \
+                   [expr {$x + $orad - 1}] $y \
+                   [expr {$x - $orad}] [expr {$y - $orad}] \
+                   [expr {$x - $orad}] [expr {$y + $orad - 1}] \
+                   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
     }
     set circleitem($row) $t
     $canv raise $t
@@ -6158,23 +6176,23 @@ proc drawcmittext {id row col} {
     set rmx [llength [lindex $rowidlist $row]]
     set olds [lindex $parentlist $row]
     if {$olds ne {}} {
-	set nextids [lindex $rowidlist [expr {$row + 1}]]
-	foreach p $olds {
-	    set i [lsearch -exact $nextids $p]
-	    if {$i > $rmx} {
-		set rmx $i
-	    }
-	}
+        set nextids [lindex $rowidlist [expr {$row + 1}]]
+        foreach p $olds {
+            set i [lsearch -exact $nextids $p]
+            if {$i > $rmx} {
+                set rmx $i
+            }
+        }
     }
     set xt [xc $row $rmx]
     set rowtextx($row) $xt
     set idpos($id) [list $x $xt $y]
     if {[info exists idtags($id)] || [info exists idheads($id)]
-	|| [info exists idotherrefs($id)]} {
-	set xt [drawtags $id $x $xt $y]
+        || [info exists idotherrefs($id)]} {
+        set xt [drawtags $id $x $xt $y]
     }
     if {[lindex $commitinfo($id) 6] > 0} {
-	set xt [drawnotesign $xt $y]
+        set xt [drawnotesign $xt $y]
     }
     set headline [lindex $commitinfo($id) 0]
     set name [lindex $commitinfo($id) 1]
@@ -6184,30 +6202,30 @@ proc drawcmittext {id row col} {
     set nfont mainfont
     set isbold [ishighlighted $id]
     if {$isbold > 0} {
-	lappend boldids $id
-	set font mainfontbold
-	if {$isbold > 1} {
-	    lappend boldnameids $id
-	    set nfont mainfontbold
-	}
+        lappend boldids $id
+        set font mainfontbold
+        if {$isbold > 1} {
+            lappend boldnameids $id
+            set nfont mainfontbold
+        }
     }
     set linehtag($id) [$canv create text $xt $y -anchor w -fill $fgcolor \
-			   -text $headline -font $font -tags text]
+                           -text $headline -font $font -tags text]
     $canv bind $linehtag($id) $ctxbut "rowmenu %X %Y $id"
     set linentag($id) [$canv2 create text 3 $y -anchor w -fill $fgcolor \
-			   -text $name -font $nfont -tags text]
+                           -text $name -font $nfont -tags text]
     set linedtag($id) [$canv3 create text 3 $y -anchor w -fill $fgcolor \
-			   -text $date -font mainfont -tags text]
+                           -text $date -font mainfont -tags text]
     if {$selectedline == $row} {
-	make_secsel $id
+        make_secsel $id
     }
     if {[info exists markedid] && $markedid eq $id} {
-	make_idmark $id
+        make_idmark $id
     }
     set xr [expr {$xt + [font measure $font $headline]}]
     if {$xr > $canvxmax} {
-	set canvxmax $xr
-	setcanvscroll
+        set canvxmax $xr
+        setcanvscroll
     }
 }
 
@@ -6223,33 +6241,33 @@ proc drawcmitrow {row} {
 
     set id [lindex $displayorder $row]
     if {[info exists hlview] && ![info exists vhighlights($id)]} {
-	askvhighlight $row $id
+        askvhighlight $row $id
     }
     if {[info exists filehighlight] && ![info exists fhighlights($id)]} {
-	askfilehighlight $row $id
+        askfilehighlight $row $id
     }
     if {$findpattern ne {} && ![info exists nhighlights($id)]} {
-	askfindhighlight $row $id
+        askfindhighlight $row $id
     }
     if {$highlight_related ne [mc "None"] && ![info exists rhighlights($id)]} {
-	askrelhighlight $row $id
+        askrelhighlight $row $id
     }
     if {![info exists iddrawn($id)]} {
-	set col [lsearch -exact [lindex $rowidlist $row] $id]
-	if {$col < 0} {
-	    puts "oops, row $row id $id not in list"
-	    return
-	}
-	if {![info exists commitinfo($id)]} {
-	    getcommit $id
-	}
-	assigncolor $id
-	drawcmittext $id $row $col
-	set iddrawn($id) 1
-	incr nrows_drawn
+        set col [lsearch -exact [lindex $rowidlist $row] $id]
+        if {$col < 0} {
+            puts "oops, row $row id $id not in list"
+            return
+        }
+        if {![info exists commitinfo($id)]} {
+            getcommit $id
+        }
+        assigncolor $id
+        drawcmittext $id $row $col
+        set iddrawn($id) 1
+        incr nrows_drawn
     }
     if {$markingmatches} {
-	markrowmatches $row $id
+        markrowmatches $row $id
     }
 }
 
@@ -6258,78 +6276,78 @@ proc drawcommits {row {endrow {}}} {
     global parentlist rowidlist rowfinal uparrowlen downarrowlen nrows_drawn
 
     if {$row < 0} {
-	set row 0
+        set row 0
     }
     if {$endrow eq {}} {
-	set endrow $row
+        set endrow $row
     }
     if {$endrow >= $numcommits} {
-	set endrow [expr {$numcommits - 1}]
+        set endrow [expr {$numcommits - 1}]
     }
 
     set rl1 [expr {$row - $downarrowlen - 3}]
     if {$rl1 < 0} {
-	set rl1 0
+        set rl1 0
     }
     set ro1 [expr {$row - 3}]
     if {$ro1 < 0} {
-	set ro1 0
+        set ro1 0
     }
     set r2 [expr {$endrow + $uparrowlen + 3}]
     if {$r2 > $numcommits} {
-	set r2 $numcommits
+        set r2 $numcommits
     }
     for {set r $rl1} {$r < $r2} {incr r} {
-	if {[lindex $rowidlist $r] ne {} && [lindex $rowfinal $r]} {
-	    if {$rl1 < $r} {
-		layoutrows $rl1 $r
-	    }
-	    set rl1 [expr {$r + 1}]
-	}
+        if {[lindex $rowidlist $r] ne {} && [lindex $rowfinal $r]} {
+            if {$rl1 < $r} {
+                layoutrows $rl1 $r
+            }
+            set rl1 [expr {$r + 1}]
+        }
     }
     if {$rl1 < $r} {
-	layoutrows $rl1 $r
+        layoutrows $rl1 $r
     }
     optimize_rows $ro1 0 $r2
     if {$need_redisplay || $nrows_drawn > 2000} {
-	clear_display
+        clear_display
     }
 
     # make the lines join to already-drawn rows either side
     set r [expr {$row - 1}]
     if {$r < 0 || ![info exists iddrawn([lindex $displayorder $r])]} {
-	set r $row
+        set r $row
     }
     set er [expr {$endrow + 1}]
     if {$er >= $numcommits ||
-	![info exists iddrawn([lindex $displayorder $er])]} {
-	set er $endrow
+        ![info exists iddrawn([lindex $displayorder $er])]} {
+        set er $endrow
     }
     for {} {$r <= $er} {incr r} {
-	set id [lindex $displayorder $r]
-	set wasdrawn [info exists iddrawn($id)]
-	drawcmitrow $r
-	if {$r == $er} break
-	set nextid [lindex $displayorder [expr {$r + 1}]]
-	if {$wasdrawn && [info exists iddrawn($nextid)]} continue
-	drawparentlinks $id $r
+        set id [lindex $displayorder $r]
+        set wasdrawn [info exists iddrawn($id)]
+        drawcmitrow $r
+        if {$r == $er} break
+        set nextid [lindex $displayorder [expr {$r + 1}]]
+        if {$wasdrawn && [info exists iddrawn($nextid)]} continue
+        drawparentlinks $id $r
 
-	set rowids [lindex $rowidlist $r]
-	foreach lid $rowids {
-	    if {$lid eq {}} continue
-	    if {[info exists lineend($lid)] && $lineend($lid) > $r} continue
-	    if {$lid eq $id} {
-		# see if this is the first child of any of its parents
-		foreach p [lindex $parentlist $r] {
-		    if {[lsearch -exact $rowids $p] < 0} {
-			# make this line extend up to the child
-			set lineend($p) [drawlineseg $p $r $er 0]
-		    }
-		}
-	    } else {
-		set lineend($lid) [drawlineseg $lid $r $er 1]
-	    }
-	}
+        set rowids [lindex $rowidlist $r]
+        foreach lid $rowids {
+            if {$lid eq {}} continue
+            if {[info exists lineend($lid)] && $lineend($lid) > $r} continue
+            if {$lid eq $id} {
+                # see if this is the first child of any of its parents
+                foreach p [lindex $parentlist $r] {
+                    if {[lsearch -exact $rowids $p] < 0} {
+                        # make this line extend up to the child
+                        set lineend($p) [drawlineseg $p $r $er 0]
+                    }
+                }
+            } else {
+                set lineend($lid) [drawlineseg $lid $r $er 1]
+            }
+        }
     }
 }
 
@@ -6339,15 +6357,15 @@ proc undolayout {row} {
 
     set r [expr {$row - ($uparrowlen + $mingaplen + $downarrowlen)}]
     if {$r < 0} {
-	set r 0
+        set r 0
     }
     if {[llength $rowidlist] > $r} {
-	incr r -1
-	set rowidlist [lrange $rowidlist 0 $r]
-	set rowfinal [lrange $rowfinal 0 $r]
-	set rowisopt [lrange $rowisopt 0 $r]
-	set need_redisplay 1
-	run drawvisible
+        incr r -1
+        set rowidlist [lrange $rowidlist 0 $r]
+        set rowfinal [lrange $rowfinal 0 $r]
+        set rowisopt [lrange $rowisopt 0 $r]
+        set need_redisplay 1
+        run drawvisible
     }
 }
 
@@ -6364,44 +6382,44 @@ proc drawvisible {} {
     set y1 [expr {int($f1 * $ymax)}]
 
     if {[info exists targetid]} {
-	if {[commitinview $targetid $curview]} {
-	    set r [rowofcommit $targetid]
-	    if {$r != $targetrow} {
-		# Fix up the scrollregion and change the scrolling position
-		# now that our target row has moved.
-		set diff [expr {($r - $targetrow) * $linespc}]
-		set targetrow $r
-		setcanvscroll
-		set ymax [lindex [$canv cget -scrollregion] 3]
-		incr y0 $diff
-		incr y1 $diff
-		set f0 [expr {$y0 / $ymax}]
-		set f1 [expr {$y1 / $ymax}]
-		allcanvs yview moveto $f0
-		$cscroll set $f0 $f1
-		set need_redisplay 1
-	    }
-	} else {
-	    unset targetid
-	}
+        if {[commitinview $targetid $curview]} {
+            set r [rowofcommit $targetid]
+            if {$r != $targetrow} {
+                # Fix up the scrollregion and change the scrolling position
+                # now that our target row has moved.
+                set diff [expr {($r - $targetrow) * $linespc}]
+                set targetrow $r
+                setcanvscroll
+                set ymax [lindex [$canv cget -scrollregion] 3]
+                incr y0 $diff
+                incr y1 $diff
+                set f0 [expr {$y0 / $ymax}]
+                set f1 [expr {$y1 / $ymax}]
+                allcanvs yview moveto $f0
+                $cscroll set $f0 $f1
+                set need_redisplay 1
+            }
+        } else {
+            unset targetid
+        }
     }
 
     set row [expr {int(($y0 - 3) / $linespc) - 1}]
     set endrow [expr {int(($y1 - 3) / $linespc) + 1}]
     if {$endrow >= $vrowmod($curview)} {
-	update_arcrows $curview
+        update_arcrows $curview
     }
     if {$selectedline ne {} &&
-	$row <= $selectedline && $selectedline <= $endrow} {
-	set targetrow $selectedline
+        $row <= $selectedline && $selectedline <= $endrow} {
+        set targetrow $selectedline
     } elseif {[info exists targetid]} {
-	set targetrow [expr {int(($row + $endrow) / 2)}]
+        set targetrow [expr {int(($row + $endrow) / 2)}]
     }
     if {[info exists targetrow]} {
-	if {$targetrow >= $numcommits} {
-	    set targetrow [expr {$numcommits - 1}]
-	}
-	set targetid [commitonrow $targetrow]
+        if {$targetrow >= $numcommits} {
+            set targetrow [expr {$numcommits - 1}]
+        }
+        set targetid [commitonrow $targetrow]
     }
     drawcommits $row $endrow
 }
@@ -6433,31 +6451,31 @@ proc findcrossings {id} {
     set cross {}
     set ccross {}
     foreach {s e} [rowranges $id] {
-	if {$e >= $numcommits} {
-	    set e [expr {$numcommits - 1}]
-	}
-	if {$e <= $s} continue
-	for {set row $e} {[incr row -1] >= $s} {} {
-	    set x [lsearch -exact [lindex $rowidlist $row] $id]
-	    if {$x < 0} break
-	    set olds [lindex $parentlist $row]
-	    set kid [lindex $displayorder $row]
-	    set kidx [lsearch -exact [lindex $rowidlist $row] $kid]
-	    if {$kidx < 0} continue
-	    set nextrow [lindex $rowidlist [expr {$row + 1}]]
-	    foreach p $olds {
-		set px [lsearch -exact $nextrow $p]
-		if {$px < 0} continue
-		if {($kidx < $x && $x < $px) || ($px < $x && $x < $kidx)} {
-		    if {[lsearch -exact $ccross $p] >= 0} continue
-		    if {$x == $px + ($kidx < $px? -1: 1)} {
-			lappend ccross $p
-		    } elseif {[lsearch -exact $cross $p] < 0} {
-			lappend cross $p
-		    }
-		}
-	    }
-	}
+        if {$e >= $numcommits} {
+            set e [expr {$numcommits - 1}]
+        }
+        if {$e <= $s} continue
+        for {set row $e} {[incr row -1] >= $s} {} {
+            set x [lsearch -exact [lindex $rowidlist $row] $id]
+            if {$x < 0} break
+            set olds [lindex $parentlist $row]
+            set kid [lindex $displayorder $row]
+            set kidx [lsearch -exact [lindex $rowidlist $row] $kid]
+            if {$kidx < 0} continue
+            set nextrow [lindex $rowidlist [expr {$row + 1}]]
+            foreach p $olds {
+                set px [lsearch -exact $nextrow $p]
+                if {$px < 0} continue
+                if {($kidx < $x && $x < $px) || ($px < $x && $x < $kidx)} {
+                    if {[lsearch -exact $ccross $p] >= 0} continue
+                    if {$x == $px + ($kidx < $px? -1: 1)} {
+                        lappend ccross $p
+                    } elseif {[lsearch -exact $cross $p] < 0} {
+                        lappend cross $p
+                    }
+                }
+            }
+        }
     }
     return [concat $ccross {{}} $cross]
 }
@@ -6469,58 +6487,58 @@ proc assigncolor {id} {
     if {[info exists colormap($id)]} return
     set ncolors [llength $colors]
     if {[info exists children($curview,$id)]} {
-	set kids $children($curview,$id)
+        set kids $children($curview,$id)
     } else {
-	set kids {}
+        set kids {}
     }
     if {[llength $kids] == 1} {
-	set child [lindex $kids 0]
-	if {[info exists colormap($child)]
-	    && [llength $parents($curview,$child)] == 1} {
-	    set colormap($id) $colormap($child)
-	    return
-	}
+        set child [lindex $kids 0]
+        if {[info exists colormap($child)]
+            && [llength $parents($curview,$child)] == 1} {
+            set colormap($id) $colormap($child)
+            return
+        }
     }
     set badcolors {}
     set origbad {}
     foreach x [findcrossings $id] {
-	if {$x eq {}} {
-	    # delimiter between corner crossings and other crossings
-	    if {[llength $badcolors] >= $ncolors - 1} break
-	    set origbad $badcolors
-	}
-	if {[info exists colormap($x)]
-	    && [lsearch -exact $badcolors $colormap($x)] < 0} {
-	    lappend badcolors $colormap($x)
-	}
+        if {$x eq {}} {
+            # delimiter between corner crossings and other crossings
+            if {[llength $badcolors] >= $ncolors - 1} break
+            set origbad $badcolors
+        }
+        if {[info exists colormap($x)]
+            && [lsearch -exact $badcolors $colormap($x)] < 0} {
+            lappend badcolors $colormap($x)
+        }
     }
     if {[llength $badcolors] >= $ncolors} {
-	set badcolors $origbad
+        set badcolors $origbad
     }
     set origbad $badcolors
     if {[llength $badcolors] < $ncolors - 1} {
-	foreach child $kids {
-	    if {[info exists colormap($child)]
-		&& [lsearch -exact $badcolors $colormap($child)] < 0} {
-		lappend badcolors $colormap($child)
-	    }
-	    foreach p $parents($curview,$child) {
-		if {[info exists colormap($p)]
-		    && [lsearch -exact $badcolors $colormap($p)] < 0} {
-		    lappend badcolors $colormap($p)
-		}
-	    }
-	}
-	if {[llength $badcolors] >= $ncolors} {
-	    set badcolors $origbad
-	}
+        foreach child $kids {
+            if {[info exists colormap($child)]
+                && [lsearch -exact $badcolors $colormap($child)] < 0} {
+                lappend badcolors $colormap($child)
+            }
+            foreach p $parents($curview,$child) {
+                if {[info exists colormap($p)]
+                    && [lsearch -exact $badcolors $colormap($p)] < 0} {
+                    lappend badcolors $colormap($p)
+                }
+            }
+        }
+        if {[llength $badcolors] >= $ncolors} {
+            set badcolors $origbad
+        }
     }
     for {set i 0} {$i <= $ncolors} {incr i} {
-	set c [lindex $colors $nextcolor]
-	if {[incr nextcolor] >= $ncolors} {
-	    set nextcolor 0
-	}
-	if {[lsearch -exact $badcolors $c]} break
+        set c [lindex $colors $nextcolor]
+        if {[incr nextcolor] >= $ncolors} {
+            set nextcolor 0
+        }
+        if {[lsearch -exact $badcolors $c]} break
     }
     set colormap($id) $c
 }
@@ -6538,9 +6556,9 @@ proc graph_pane_width {} {
     global use_ttk
 
     if {$use_ttk} {
-	set g [.tf.histframe.pwclist sashpos 0]
+        set g [.tf.histframe.pwclist sashpos 0]
     } else {
-	set g [.tf.histframe.pwclist sash coord 0]
+        set g [.tf.histframe.pwclist sash coord 0]
     }
     return [lindex $g 0]
 }
@@ -6548,7 +6566,7 @@ proc graph_pane_width {} {
 proc totalwidth {l font extra} {
     set tot 0
     foreach str $l {
-	set tot [expr {$tot + [font measure $font $str] + $extra}]
+        set tot [expr {$tot + [font measure $font $str] + $extra}]
     }
     return $tot
 }
@@ -6572,29 +6590,29 @@ proc drawtags {id x xt y1} {
     set extra [expr {$delta + $lthickness + $linespc}]
 
     if {[info exists idtags($id)]} {
-	set marks $idtags($id)
-	set ntags [llength $marks]
-	if {$ntags > $maxtags ||
-	    [totalwidth $marks mainfont $extra] > $maxwidth} {
-	    # show just a single "n tags..." tag
-	    set singletag 1
-	    if {$ntags == 1} {
-		set marks [list "tag..."]
-	    } else {
-		set marks [list [format "%d tags..." $ntags]]
-	    }
-	    set ntags 1
-	}
+        set marks $idtags($id)
+        set ntags [llength $marks]
+        if {$ntags > $maxtags ||
+            [totalwidth $marks mainfont $extra] > $maxwidth} {
+            # show just a single "n tags..." tag
+            set singletag 1
+            if {$ntags == 1} {
+                set marks [list "tag..."]
+            } else {
+                set marks [list [format "%d tags..." $ntags]]
+            }
+            set ntags 1
+        }
     }
     if {[info exists idheads($id)]} {
-	set marks [concat $marks $idheads($id)]
-	set nheads [llength $idheads($id)]
+        set marks [concat $marks $idheads($id)]
+        set nheads [llength $idheads($id)]
     }
     if {[info exists idotherrefs($id)]} {
-	set marks [concat $marks $idotherrefs($id)]
+        set marks [concat $marks $idotherrefs($id)]
     }
     if {$marks eq {}} {
-	return $xt
+        return $xt
     }
 
     set yt [expr {$y1 - 0.5 * $linespc}]
@@ -6603,66 +6621,66 @@ proc drawtags {id x xt y1} {
     set wvals {}
     set i -1
     foreach tag $marks {
-	incr i
-	if {$i >= $ntags && $i < $ntags + $nheads && $tag eq $mainhead} {
-	    set wid [font measure mainfontbold $tag]
-	} else {
-	    set wid [font measure mainfont $tag]
-	}
-	lappend xvals $xt
-	lappend wvals $wid
-	set xt [expr {$xt + $wid + $extra}]
+        incr i
+        if {$i >= $ntags && $i < $ntags + $nheads && $tag eq $mainhead} {
+            set wid [font measure mainfontbold $tag]
+        } else {
+            set wid [font measure mainfont $tag]
+        }
+        lappend xvals $xt
+        lappend wvals $wid
+        set xt [expr {$xt + $wid + $extra}]
     }
     set t [$canv create line $x $y1 [lindex $xvals end] $y1 \
-	       -width $lthickness -fill $reflinecolor -tags tag.$id]
+               -width $lthickness -fill $reflinecolor -tags tag.$id]
     $canv lower $t
     foreach tag $marks x $xvals wid $wvals {
-	set tag_quoted [string map {% %%} $tag]
-	set xl [expr {$x + $delta}]
-	set xr [expr {$x + $delta + $wid + $lthickness}]
-	set font mainfont
-	if {[incr ntags -1] >= 0} {
-	    # draw a tag
-	    set t [$canv create polygon $x [expr {$yt + $delta}] $xl $yt \
-		       $xr $yt $xr $yb $xl $yb $x [expr {$yb - $delta}] \
-		       -width 1 -outline $tagoutlinecolor -fill $tagbgcolor \
-		       -tags tag.$id]
-	    if {$singletag} {
-		set tagclick [list showtags $id 1]
-	    } else {
-		set tagclick [list showtag $tag_quoted 1]
-	    }
-	    $canv bind $t <1> $tagclick
-	    set rowtextx([rowofcommit $id]) [expr {$xr + $linespc}]
-	} else {
-	    # draw a head or other ref
-	    if {[incr nheads -1] >= 0} {
-		set col $headbgcolor
-		if {$tag eq $mainhead} {
-		    set font mainfontbold
-		}
-	    } else {
-		set col "#ddddff"
-	    }
-	    set xl [expr {$xl - $delta/2}]
-	    $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
-		-width 1 -outline black -fill $col -tags tag.$id
-	    if {[regexp {^(remotes/.*/|remotes/)} $tag match remoteprefix]} {
-	        set rwid [font measure mainfont $remoteprefix]
-		set xi [expr {$x + 1}]
-		set yti [expr {$yt + 1}]
-		set xri [expr {$x + $rwid}]
-		$canv create polygon $xi $yti $xri $yti $xri $yb $xi $yb \
-			-width 0 -fill $remotebgcolor -tags tag.$id
-	    }
-	}
-	set t [$canv create text $xl $y1 -anchor w -text $tag -fill $headfgcolor \
-		   -font $font -tags [list tag.$id text]]
-	if {$ntags >= 0} {
-	    $canv bind $t <1> $tagclick
-	} elseif {$nheads >= 0} {
-	    $canv bind $t $ctxbut [list headmenu %X %Y $id $tag_quoted]
-	}
+        set tag_quoted [string map {% %%} $tag]
+        set xl [expr {$x + $delta}]
+        set xr [expr {$x + $delta + $wid + $lthickness}]
+        set font mainfont
+        if {[incr ntags -1] >= 0} {
+            # draw a tag
+            set t [$canv create polygon $x [expr {$yt + $delta}] $xl $yt \
+                       $xr $yt $xr $yb $xl $yb $x [expr {$yb - $delta}] \
+                       -width 1 -outline $tagoutlinecolor -fill $tagbgcolor \
+                       -tags tag.$id]
+            if {$singletag} {
+                set tagclick [list showtags $id 1]
+            } else {
+                set tagclick [list showtag $tag_quoted 1]
+            }
+            $canv bind $t <1> $tagclick
+            set rowtextx([rowofcommit $id]) [expr {$xr + $linespc}]
+        } else {
+            # draw a head or other ref
+            if {[incr nheads -1] >= 0} {
+                set col $headbgcolor
+                if {$tag eq $mainhead} {
+                    set font mainfontbold
+                }
+            } else {
+                set col "#ddddff"
+            }
+            set xl [expr {$xl - $delta/2}]
+            $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
+                -width 1 -outline black -fill $col -tags tag.$id
+            if {[regexp {^(remotes/.*/|remotes/)} $tag match remoteprefix]} {
+                set rwid [font measure mainfont $remoteprefix]
+                set xi [expr {$x + 1}]
+                set yti [expr {$yt + 1}]
+                set xri [expr {$x + $rwid}]
+                $canv create polygon $xi $yti $xri $yti $xri $yb $xi $yb \
+                        -width 0 -fill $remotebgcolor -tags tag.$id
+            }
+        }
+        set t [$canv create text $xl $y1 -anchor w -text $tag -fill $headfgcolor \
+                   -font $font -tags [list tag.$id text]]
+        if {$ntags >= 0} {
+            $canv bind $t <1> $tagclick
+        } elseif {$nheads >= 0} {
+            $canv bind $t $ctxbut [list headmenu %X %Y $id $tag_quoted]
+        }
     }
     return $xt
 }
@@ -6672,8 +6690,8 @@ proc drawnotesign {xt y} {
 
     set orad [expr {$linespc / 3}]
     set t [$canv create rectangle [expr {$xt - $orad}] [expr {$y - $orad}] \
-	       [expr {$xt + $orad - 1}] [expr {$y + $orad - 1}] \
-	       -fill yellow -outline $fgcolor -width 1 -tags circle]
+               [expr {$xt + $orad - 1}] [expr {$y + $orad - 1}] \
+               -fill yellow -outline $fgcolor -width 1 -tags circle]
     set xt [expr {$xt + $orad * 3}]
     return $xt
 }
@@ -6683,9 +6701,9 @@ proc xcoord {i level ln} {
 
     set x [expr {$canvx0 + $i * $xspc1($ln)}]
     if {$i > 0 && $i == $level} {
-	set x [expr {$x + 0.5 * ($xspc2 - $xspc1($ln))}]
+        set x [expr {$x + 0.5 * ($xspc2 - $xspc1($ln))}]
     } elseif {$i > $level} {
-	set x [expr {$x + $xspc2 - $xspc1($ln)}]
+        set x [expr {$x + $xspc2 - $xspc1($ln)}]
     }
     return $x
 }
@@ -6696,7 +6714,7 @@ proc show_status {msg} {
     clear_display
     set_window_title
     $canv create text 3 3 -anchor nw -text $msg -font mainfont \
-	-tags text -fill $fgcolor
+        -tags text -fill $fgcolor
 }
 
 # Don't change the text pane cursor if it is currently the hand cursor,
@@ -6705,7 +6723,7 @@ proc settextcursor {c} {
     global ctext curtextcursor
 
     if {[$ctext cget -cursor] == $curtextcursor} {
-	$ctext config -cursor $c
+        $ctext config -cursor $c
     }
     set curtextcursor $c
 }
@@ -6714,13 +6732,13 @@ proc nowbusy {what {name {}}} {
     global isbusy busyname statusw
 
     if {[array names isbusy] eq {}} {
-	. config -cursor watch
-	settextcursor watch
+        . config -cursor watch
+        settextcursor watch
     }
     set isbusy($what) 1
     set busyname($what) $name
     if {$name ne {}} {
-	$statusw conf -text $name
+        $statusw conf -text $name
     }
 }
 
@@ -6728,35 +6746,35 @@ proc notbusy {what} {
     global isbusy maincursor textcursor busyname statusw
 
     catch {
-	unset isbusy($what)
-	if {$busyname($what) ne {} &&
-	    [$statusw cget -text] eq $busyname($what)} {
-	    $statusw conf -text {}
-	}
+        unset isbusy($what)
+        if {$busyname($what) ne {} &&
+            [$statusw cget -text] eq $busyname($what)} {
+            $statusw conf -text {}
+        }
     }
     if {[array names isbusy] eq {}} {
-	. config -cursor $maincursor
-	settextcursor $textcursor
+        . config -cursor $maincursor
+        settextcursor $textcursor
     }
 }
 
 proc findmatches {f} {
     global findtype findstring
     if {$findtype == [mc "Regexp"]} {
-	set matches [regexp -indices -all -inline $findstring $f]
+        set matches [regexp -indices -all -inline $findstring $f]
     } else {
-	set fs $findstring
-	if {$findtype == [mc "IgnCase"]} {
-	    set f [string tolower $f]
-	    set fs [string tolower $fs]
-	}
-	set matches {}
-	set i 0
-	set l [string length $fs]
-	while {[set j [string first $fs $f $i]] >= 0} {
-	    lappend matches [list $j [expr {$j+$l-1}]]
-	    set i [expr {$j + $l}]
-	}
+        set fs $findstring
+        if {$findtype == [mc "IgnCase"]} {
+            set f [string tolower $f]
+            set fs [string tolower $fs]
+        }
+        set matches {}
+        set i 0
+        set l [string length $fs]
+        while {[set j [string first $fs $f $i]] >= 0} {
+            lappend matches [list $j [expr {$j+$l-1}]]
+            set i [expr {$j + $l}]
+        }
     }
     return $matches
 }
@@ -6766,21 +6784,21 @@ proc dofind {{dirn 1} {wrap 1}} {
     global gdttype filehighlight fh_serial find_dirn findallowwrap
 
     if {[info exists find_dirn]} {
-	if {$find_dirn == $dirn} return
-	stopfinding
+        if {$find_dirn == $dirn} return
+        stopfinding
     }
     focus .
     if {$findstring eq {} || $numcommits == 0} return
     if {$selectedline eq {}} {
-	set findstartline [lindex [visiblerows] [expr {$dirn < 0}]]
+        set findstartline [lindex [visiblerows] [expr {$dirn < 0}]]
     } else {
-	set findstartline $selectedline
+        set findstartline $selectedline
     }
     set findcurline $findstartline
     nowbusy finding [mc "Searching"]
     if {$gdttype ne [mc "containing:"] && ![info exists filehighlight]} {
-	after cancel do_file_hl $fh_serial
-	do_file_hl $fh_serial
+        after cancel do_file_hl $fh_serial
+        do_file_hl $fh_serial
     }
     set find_dirn $dirn
     set findallowwrap $wrap
@@ -6791,11 +6809,11 @@ proc stopfinding {} {
     global find_dirn findcurline fprogcoord
 
     if {[info exists find_dirn]} {
-	unset find_dirn
-	unset findcurline
-	notbusy finding
-	set fprogcoord 0
-	adjustprogress
+        unset find_dirn
+        unset findcurline
+        notbusy finding
+        set fprogcoord 0
+        adjustprogress
     }
     stopblaming
 }
@@ -6807,41 +6825,41 @@ proc findmore {} {
     global curview varcorder vrownum varccommits vrowmod
 
     if {![info exists find_dirn]} {
-	return 0
+        return 0
     }
     set fldtypes [list [mc "Headline"] [mc "Author"] "" [mc "Committer"] "" [mc "Comments"]]
     set l $findcurline
     set moretodo 0
     if {$find_dirn > 0} {
-	incr l
-	if {$l >= $numcommits} {
-	    set l 0
-	}
-	if {$l <= $findstartline} {
-	    set lim [expr {$findstartline + 1}]
-	} else {
-	    set lim $numcommits
-	    set moretodo $findallowwrap
-	}
+        incr l
+        if {$l >= $numcommits} {
+            set l 0
+        }
+        if {$l <= $findstartline} {
+            set lim [expr {$findstartline + 1}]
+        } else {
+            set lim $numcommits
+            set moretodo $findallowwrap
+        }
     } else {
-	if {$l == 0} {
-	    set l $numcommits
-	}
-	incr l -1
-	if {$l >= $findstartline} {
-	    set lim [expr {$findstartline - 1}]
-	} else {
-	    set lim -1
-	    set moretodo $findallowwrap
-	}
+        if {$l == 0} {
+            set l $numcommits
+        }
+        incr l -1
+        if {$l >= $findstartline} {
+            set lim [expr {$findstartline - 1}]
+        } else {
+            set lim -1
+            set moretodo $findallowwrap
+        }
     }
     set n [expr {($lim - $l) * $find_dirn}]
     if {$n > 500} {
-	set n 500
-	set moretodo 1
+        set n 500
+        set moretodo 1
     }
     if {$l + ($find_dirn > 0? $n: 1) > $vrowmod($curview)} {
-	update_arcrows $curview
+        update_arcrows $curview
     }
     set found 0
     set domore 1
@@ -6851,81 +6869,81 @@ proc findmore {} {
     set ids [lindex $varccommits($curview,$a)]
     set arowend [expr {$arow + [llength $ids]}]
     if {$gdttype eq [mc "containing:"]} {
-	for {} {$n > 0} {incr n -1; incr l $find_dirn} {
-	    if {$l < $arow || $l >= $arowend} {
-		incr ai $find_dirn
-		set a [lindex $varcorder($curview) $ai]
-		set arow [lindex $vrownum($curview) $ai]
-		set ids [lindex $varccommits($curview,$a)]
-		set arowend [expr {$arow + [llength $ids]}]
-	    }
-	    set id [lindex $ids [expr {$l - $arow}]]
-	    # shouldn't happen unless git log doesn't give all the commits...
-	    if {![info exists commitdata($id)] ||
-		![doesmatch $commitdata($id)]} {
-		continue
-	    }
-	    if {![info exists commitinfo($id)]} {
-		getcommit $id
-	    }
-	    set info $commitinfo($id)
-	    foreach f $info ty $fldtypes {
-		if {$ty eq ""} continue
-		if {($findloc eq [mc "All fields"] || $findloc eq $ty) &&
-		    [doesmatch $f]} {
-		    set found 1
-		    break
-		}
-	    }
-	    if {$found} break
-	}
+        for {} {$n > 0} {incr n -1; incr l $find_dirn} {
+            if {$l < $arow || $l >= $arowend} {
+                incr ai $find_dirn
+                set a [lindex $varcorder($curview) $ai]
+                set arow [lindex $vrownum($curview) $ai]
+                set ids [lindex $varccommits($curview,$a)]
+                set arowend [expr {$arow + [llength $ids]}]
+            }
+            set id [lindex $ids [expr {$l - $arow}]]
+            # shouldn't happen unless git log doesn't give all the commits...
+            if {![info exists commitdata($id)] ||
+                ![doesmatch $commitdata($id)]} {
+                continue
+            }
+            if {![info exists commitinfo($id)]} {
+                getcommit $id
+            }
+            set info $commitinfo($id)
+            foreach f $info ty $fldtypes {
+                if {$ty eq ""} continue
+                if {($findloc eq [mc "All fields"] || $findloc eq $ty) &&
+                    [doesmatch $f]} {
+                    set found 1
+                    break
+                }
+            }
+            if {$found} break
+        }
     } else {
-	for {} {$n > 0} {incr n -1; incr l $find_dirn} {
-	    if {$l < $arow || $l >= $arowend} {
-		incr ai $find_dirn
-		set a [lindex $varcorder($curview) $ai]
-		set arow [lindex $vrownum($curview) $ai]
-		set ids [lindex $varccommits($curview,$a)]
-		set arowend [expr {$arow + [llength $ids]}]
-	    }
-	    set id [lindex $ids [expr {$l - $arow}]]
-	    if {![info exists fhighlights($id)]} {
-		# this sets fhighlights($id) to -1
-		askfilehighlight $l $id
-	    }
-	    if {$fhighlights($id) > 0} {
-		set found $domore
-		break
-	    }
-	    if {$fhighlights($id) < 0} {
-		if {$domore} {
-		    set domore 0
-		    set findcurline [expr {$l - $find_dirn}]
-		}
-	    }
-	}
+        for {} {$n > 0} {incr n -1; incr l $find_dirn} {
+            if {$l < $arow || $l >= $arowend} {
+                incr ai $find_dirn
+                set a [lindex $varcorder($curview) $ai]
+                set arow [lindex $vrownum($curview) $ai]
+                set ids [lindex $varccommits($curview,$a)]
+                set arowend [expr {$arow + [llength $ids]}]
+            }
+            set id [lindex $ids [expr {$l - $arow}]]
+            if {![info exists fhighlights($id)]} {
+                # this sets fhighlights($id) to -1
+                askfilehighlight $l $id
+            }
+            if {$fhighlights($id) > 0} {
+                set found $domore
+                break
+            }
+            if {$fhighlights($id) < 0} {
+                if {$domore} {
+                    set domore 0
+                    set findcurline [expr {$l - $find_dirn}]
+                }
+            }
+        }
     }
     if {$found || ($domore && !$moretodo)} {
-	unset findcurline
-	unset find_dirn
-	notbusy finding
-	set fprogcoord 0
-	adjustprogress
-	if {$found} {
-	    findselectline $l
-	} else {
-	    bell
-	}
-	return 0
+        unset findcurline
+        unset find_dirn
+        notbusy finding
+        set fprogcoord 0
+        adjustprogress
+        if {$found} {
+            findselectline $l
+        } else {
+            bell
+        }
+        return 0
     }
     if {!$domore} {
-	flushhighlights
+        flushhighlights
     } else {
-	set findcurline [expr {$l - $find_dirn}]
+        set findcurline [expr {$l - $find_dirn}]
     }
     set n [expr {($findcurline - $findstartline) * $find_dirn - 1}]
     if {$n < 0} {
-	incr n $numcommits
+        incr n $numcommits
     }
     set fprogcoord [expr {$n * 1.0 / $numcommits}]
     adjustprogress
@@ -6939,15 +6957,15 @@ proc findselectline {l} {
     set findcurline $l
     selectline $l 1
     if {$markingmatches &&
-	($findloc eq [mc "All fields"] || $findloc eq [mc "Comments"])} {
-	# highlight the matches in the comments
-	set f [$ctext get 1.0 $commentend]
-	set matches [findmatches $f]
-	foreach match $matches {
-	    set start [lindex $match 0]
-	    set end [expr {[lindex $match 1] + 1}]
-	    $ctext tag add found "1.0 + $start c" "1.0 + $end c"
-	}
+        ($findloc eq [mc "All fields"] || $findloc eq [mc "Comments"])} {
+        # highlight the matches in the comments
+        set f [$ctext get 1.0 $commentend]
+        set matches [findmatches $f]
+        foreach match $matches {
+            set start [lindex $match 0]
+            set end [expr {[lindex $match 1] + 1}]
+            $ctext tag add found "1.0 + $start c" "1.0 + $end c"
+        }
     }
     drawvisible
 }
@@ -6961,18 +6979,18 @@ proc markmatches {canv l str tag matches font row} {
     set y0 [lindex $bbox 1]
     set y1 [lindex $bbox 3]
     foreach match $matches {
-	set start [lindex $match 0]
-	set end [lindex $match 1]
-	if {$start > $end} continue
-	set xoff [font measure $font [string range $str 0 [expr {$start-1}]]]
-	set xlen [font measure $font [string range $str 0 [expr {$end}]]]
-	set t [$canv create rect [expr {$x0+$xoff}] $y0 \
-		   [expr {$x0+$xlen+2}] $y1 \
-		   -outline {} -tags [list match$l matches] -fill yellow]
-	$canv lower $t
-	if {$row == $selectedline} {
-	    $canv raise $t secsel
-	}
+        set start [lindex $match 0]
+        set end [lindex $match 1]
+        if {$start > $end} continue
+        set xoff [font measure $font [string range $str 0 [expr {$start-1}]]]
+        set xlen [font measure $font [string range $str 0 [expr {$end}]]]
+        set t [$canv create rect [expr {$x0+$xoff}] $y0 \
+                   [expr {$x0+$xlen+2}] $y1 \
+                   -outline {} -tags [list match$l matches] -fill yellow]
+        $canv lower $t
+        if {$row == $selectedline} {
+            $canv raise $t secsel
+        }
     }
 }
 
@@ -6993,12 +7011,12 @@ proc selcanvline {w x y} {
     set y [expr {$y + $yfrac * $ymax}]
     set l [expr {int(($y - $canvy0) / $linespc + 0.5)}]
     if {$l < 0} {
-	set l 0
+        set l 0
     }
     if {$w eq $canv} {
-	set xmax [lindex [$canv cget -scrollregion] 2]
-	set xleft [expr {[lindex [$canv xview] 0] * $xmax}]
-	if {![info exists rowtextx($l)] || $xleft + $x < $rowtextx($l)} return
+        set xmax [lindex [$canv cget -scrollregion] 2]
+        set xleft [expr {[lindex [$canv xview] 0] * $xmax}]
+        if {![info exists rowtextx($l)] || $xleft + $x < $rowtextx($l)} return
     }
     unmarkmatches
     selectline $l 1
@@ -7007,11 +7025,11 @@ proc selcanvline {w x y} {
 proc commit_descriptor {p} {
     global commitinfo
     if {![info exists commitinfo($p)]} {
-	getcommit $p
+        getcommit $p
     }
     set l "..."
     if {[llength $commitinfo($p)] > 1} {
-	set l [lindex $commitinfo($p) 0]
+        set l [lindex $commitinfo($p) 0]
     }
     return "$p ($l)\n"
 }
@@ -7026,26 +7044,26 @@ proc appendwithlinks {text tags} {
     $ctext insert end $text $tags
     set links [regexp -indices -all -inline {(?:\m|-g)[0-9a-f]{6,40}\M} $text]
     foreach l $links {
-	set s [lindex $l 0]
-	set e [lindex $l 1]
-	set linkid [string range $text $s $e]
-	incr e
-	$ctext tag delete link$linknum
-	$ctext tag add link$linknum "$start + $s c" "$start + $e c"
-	setlink $linkid link$linknum
-	incr linknum
+        set s [lindex $l 0]
+        set e [lindex $l 1]
+        set linkid [string range $text $s $e]
+        incr e
+        $ctext tag delete link$linknum
+        $ctext tag add link$linknum "$start + $s c" "$start + $e c"
+        setlink $linkid link$linknum
+        incr linknum
     }
     set wlinks [regexp -indices -all -inline -line \
-		    {https?://[^[:space:]]+} $text]
+                    {https?://[^[:space:]]+} $text]
     foreach l $wlinks {
-	set s2 [lindex $l 0]
-	set e2 [lindex $l 1]
-	set url [string range $text $s2 $e2]
-	incr e2
-	$ctext tag delete link$linknum
-	$ctext tag add link$linknum "$start + $s2 c" "$start + $e2 c"
-	setwlink $url link$linknum
-	incr linknum
+        set s2 [lindex $l 0]
+        set e2 [lindex $l 1]
+        set url [string range $text $s2 $e2]
+        incr e2
+        $ctext tag delete link$linknum
+        $ctext tag add link$linknum "$start + $s2 c" "$start + $e2 c"
+        setwlink $url link$linknum
+        incr linknum
     }
 }
 
@@ -7059,23 +7077,23 @@ proc setlink {id lk} {
 
     set known 0
     if {[string length $id] < 40} {
-	set matches [longid $id]
-	if {[llength $matches] > 0} {
-	    if {[llength $matches] > 1} return
-	    set known 1
-	    set id [lindex $matches 0]
-	}
+        set matches [longid $id]
+        if {[llength $matches] > 0} {
+            if {[llength $matches] > 1} return
+            set known 1
+            set id [lindex $matches 0]
+        }
     } else {
-	set known [commitinview $id $curview]
+        set known [commitinview $id $curview]
     }
     if {$known} {
-	$ctext tag conf $lk -foreground $linkfgcolor -underline 1
-	$ctext tag bind $lk <1> [list selbyid $id]
-	$ctext tag bind $lk <Enter> {linkcursor %W 1}
-	$ctext tag bind $lk <Leave> {linkcursor %W -1}
+        $ctext tag conf $lk -foreground $linkfgcolor -underline 1
+        $ctext tag bind $lk <1> [list selbyid $id]
+        $ctext tag bind $lk <Enter> {linkcursor %W 1}
+        $ctext tag bind $lk <Leave> {linkcursor %W -1}
     } else {
-	lappend pendinglinks($id) $lk
-	interestedin $id {makelink %P}
+        lappend pendinglinks($id) $lk
+        interestedin $id {makelink %P}
     }
 }
 
@@ -7107,7 +7125,7 @@ proc makelink {id} {
 
     if {![info exists pendinglinks($id)]} return
     foreach lk $pendinglinks($id) {
-	setlink $id $lk
+        setlink $id $lk
     }
     unset pendinglinks($id)
 }
@@ -7116,12 +7134,12 @@ proc linkcursor {w inc} {
     global linkentercount curtextcursor
 
     if {[incr linkentercount $inc] > 0} {
-	$w configure -cursor hand2
+        $w configure -cursor hand2
     } else {
-	$w configure -cursor $curtextcursor
-	if {$linkentercount < 0} {
-	    set linkentercount 0
-	}
+        $w configure -cursor $curtextcursor
+        if {$linkentercount < 0} {
+            set linkentercount 0
+        }
     }
 }
 
@@ -7131,7 +7149,7 @@ proc browseweb {url} {
     if {$web_browser eq {}} return
     # Use eval here in case $web_browser is a command plus some arguments
     if {[catch {eval exec $web_browser [list $url] &} err]} {
-	error_popup "[mc "Error starting web browser:"] $err"
+        error_popup "[mc "Error starting web browser:"] $err"
     }
 }
 
@@ -7144,9 +7162,9 @@ proc viewnextline {dir} {
     set wtop [expr {[lindex $wnow 0] * $ymax}]
     set newtop [expr {$wtop + $dir * $linespc}]
     if {$newtop < 0} {
-	set newtop 0
+        set newtop 0
     } elseif {$newtop > $ymax} {
-	set newtop $ymax
+        set newtop $ymax
     }
     allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
 }
@@ -7157,15 +7175,15 @@ proc appendrefs {pos ids var} {
     global ctext linknum curview $var maxrefs visiblerefs mainheadid
 
     if {[catch {$ctext index $pos}]} {
-	return 0
+        return 0
     }
     $ctext conf -state normal
     $ctext delete $pos "$pos lineend"
     set tags {}
     foreach id $ids {
-	foreach tag [set $var\($id\)] {
-	    lappend tags [list $tag $id]
-	}
+        foreach tag [set $var\($id\)] {
+            lappend tags [list $tag $id]
+        }
     }
 
     set sep {}
@@ -7173,44 +7191,44 @@ proc appendrefs {pos ids var} {
     set nutags 0
 
     if {[llength $tags] > $maxrefs} {
-	# If we are displaying heads, and there are too many,
-	# see if there are some important heads to display.
-	# Currently that are the current head and heads listed in $visiblerefs option
-	set itags {}
-	if {$var eq "idheads"} {
-	    set utags {}
-	    foreach ti $tags {
-		set hname [lindex $ti 0]
-		set id [lindex $ti 1]
-		if {([lsearch -exact $visiblerefs $hname] != -1 || $id eq $mainheadid) &&
-		    [llength $itags] < $maxrefs} {
-		    lappend itags $ti
-		} else {
-		    lappend utags $ti
-		}
-	    }
-	    set tags $utags
-	}
-	if {$itags ne {}} {
-	    set str [mc "and many more"]
-	    set sep " "
-	} else {
-	    set str [mc "many"]
-	}
-	$ctext insert $pos "$str ([llength $tags])"
-	set nutags [llength $tags]
-	set tags $itags
+        # If we are displaying heads, and there are too many,
+        # see if there are some important heads to display.
+        # Currently that are the current head and heads listed in $visiblerefs option
+        set itags {}
+        if {$var eq "idheads"} {
+            set utags {}
+            foreach ti $tags {
+                set hname [lindex $ti 0]
+                set id [lindex $ti 1]
+                if {([lsearch -exact $visiblerefs $hname] != -1 || $id eq $mainheadid) &&
+                    [llength $itags] < $maxrefs} {
+                    lappend itags $ti
+                } else {
+                    lappend utags $ti
+                }
+            }
+            set tags $utags
+        }
+        if {$itags ne {}} {
+            set str [mc "and many more"]
+            set sep " "
+        } else {
+            set str [mc "many"]
+        }
+        $ctext insert $pos "$str ([llength $tags])"
+        set nutags [llength $tags]
+        set tags $itags
     }
 
     foreach ti $tags {
-	set id [lindex $ti 1]
-	set lk link$linknum
-	incr linknum
-	$ctext tag delete $lk
-	$ctext insert $pos $sep
-	$ctext insert $pos [lindex $ti 0] $lk
-	setlink $id $lk
-	set sep ", "
+        set id [lindex $ti 1]
+        set lk link$linknum
+        incr linknum
+        $ctext tag delete $lk
+        $ctext insert $pos $sep
+        $ctext insert $pos [lindex $ti 0] $lk
+        setlink $id $lk
+        set sep ", "
     }
     $ctext tag add wwrap "$pos linestart" "$pos lineend"
     $ctext conf -state disabled
@@ -7224,11 +7242,11 @@ proc dispneartags {delay} {
     if {$selectedline eq {} || !$showneartags} return
     after cancel dispnexttag
     if {$delay} {
-	after 200 dispnexttag
-	set tagphase -1
+        after 200 dispnexttag
+        set tagphase -1
     } else {
-	after idle dispnexttag
-	set tagphase 0
+        after idle dispnexttag
+        set tagphase 0
     }
 }
 
@@ -7237,33 +7255,33 @@ proc dispnexttag {} {
 
     if {$selectedline eq {} || !$showneartags} return
     switch -- $tagphase {
-	0 {
-	    set dtags [desctags $currentid]
-	    if {$dtags ne {}} {
-		appendrefs precedes $dtags idtags
-	    }
-	}
-	1 {
-	    set atags [anctags $currentid]
-	    if {$atags ne {}} {
-		appendrefs follows $atags idtags
-	    }
-	}
-	2 {
-	    set dheads [descheads $currentid]
-	    if {$dheads ne {}} {
-		if {[appendrefs branch $dheads idheads] > 1
-		    && [$ctext get "branch -3c"] eq "h"} {
-		    # turn "Branch" into "Branches"
-		    $ctext conf -state normal
-		    $ctext insert "branch -2c" "es"
-		    $ctext conf -state disabled
-		}
-	    }
-	}
+        0 {
+            set dtags [desctags $currentid]
+            if {$dtags ne {}} {
+                appendrefs precedes $dtags idtags
+            }
+        }
+        1 {
+            set atags [anctags $currentid]
+            if {$atags ne {}} {
+                appendrefs follows $atags idtags
+            }
+        }
+        2 {
+            set dheads [descheads $currentid]
+            if {$dheads ne {}} {
+                if {[appendrefs branch $dheads idheads] > 1
+                    && [$ctext get "branch -3c"] eq "h"} {
+                    # turn "Branch" into "Branches"
+                    $ctext conf -state normal
+                    $ctext insert "branch -2c" "es"
+                    $ctext conf -state disabled
+                }
+            }
+        }
     }
     if {[incr tagphase] <= 2} {
-	after idle dispnexttag
+        after idle dispnexttag
     }
 }
 
@@ -7273,15 +7291,15 @@ proc make_secsel {id} {
     if {![info exists linehtag($id)]} return
     $canv delete secsel
     set t [eval $canv create rect [$canv bbox $linehtag($id)] -outline {{}} \
-	       -tags secsel -fill [$canv cget -selectbackground]]
+               -tags secsel -fill [$canv cget -selectbackground]]
     $canv lower $t
     $canv2 delete secsel
     set t [eval $canv2 create rect [$canv2 bbox $linentag($id)] -outline {{}} \
-	       -tags secsel -fill [$canv2 cget -selectbackground]]
+               -tags secsel -fill [$canv2 cget -selectbackground]]
     $canv2 lower $t
     $canv3 delete secsel
     set t [eval $canv3 create rect [$canv3 bbox $linedtag($id)] -outline {{}} \
-	       -tags secsel -fill [$canv3 cget -selectbackground]]
+               -tags secsel -fill [$canv3 cget -selectbackground]]
     $canv3 lower $t
 }
 
@@ -7291,7 +7309,7 @@ proc make_idmark {id} {
     if {![info exists linehtag($id)]} return
     $canv delete markid
     set t [eval $canv create rect [$canv bbox $linehtag($id)] \
-	       -tags markid -outline $fgcolor]
+               -tags markid -outline $fgcolor]
     $canv raise $t
 }
 
@@ -7318,7 +7336,7 @@ proc selectline {l isnew {desired_loc {}} {switch_to_patch 0}} {
     set selectedline $l
     set currentid $id
     if {$lastscrollrows < $numcommits} {
-	setcanvscroll
+        setcanvscroll
     }
 
     if {$cmitmode ne "patch" && $switch_to_patch} {
@@ -7335,42 +7353,42 @@ proc selectline {l isnew {desired_loc {}} {switch_to_patch 0}} {
     set wh [expr {$wbot - $wtop}]
     set newtop $wtop
     if {$ytop < $wtop} {
-	if {$ybot < $wtop} {
-	    set newtop [expr {$y - $wh / 2.0}]
-	} else {
-	    set newtop $ytop
-	    if {$newtop > $wtop - $linespc} {
-		set newtop [expr {$wtop - $linespc}]
-	    }
-	}
+        if {$ybot < $wtop} {
+            set newtop [expr {$y - $wh / 2.0}]
+        } else {
+            set newtop $ytop
+            if {$newtop > $wtop - $linespc} {
+                set newtop [expr {$wtop - $linespc}]
+            }
+        }
     } elseif {$ybot > $wbot} {
-	if {$ytop > $wbot} {
-	    set newtop [expr {$y - $wh / 2.0}]
-	} else {
-	    set newtop [expr {$ybot - $wh}]
-	    if {$newtop < $wtop + $linespc} {
-		set newtop [expr {$wtop + $linespc}]
-	    }
-	}
+        if {$ytop > $wbot} {
+            set newtop [expr {$y - $wh / 2.0}]
+        } else {
+            set newtop [expr {$ybot - $wh}]
+            if {$newtop < $wtop + $linespc} {
+                set newtop [expr {$wtop + $linespc}]
+            }
+        }
     }
     if {$newtop != $wtop} {
-	if {$newtop < 0} {
-	    set newtop 0
-	}
-	allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
-	drawvisible
+        if {$newtop < 0} {
+            set newtop 0
+        }
+        allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
+        drawvisible
     }
 
     make_secsel $id
 
     if {$isnew} {
-	addtohistory [list selbyid $id 0] savecmitpos
+        addtohistory [list selbyid $id 0] savecmitpos
     }
 
     $sha1entry delete 0 end
     $sha1entry insert 0 $id
     if {$autoselect} {
-	$sha1entry selection range 0 $autosellen
+        $sha1entry selection range 0 $autosellen
     }
     rhighlight_sel $id
 
@@ -7378,7 +7396,7 @@ proc selectline {l isnew {desired_loc {}} {switch_to_patch 0}} {
     clear_ctext
     set linknum 0
     if {![info exists commitinfo($id)]} {
-	getcommit $id
+        getcommit $id
     }
     set info $commitinfo($id)
     set date [formatdate [lindex $info 2]]
@@ -7386,59 +7404,59 @@ proc selectline {l isnew {desired_loc {}} {switch_to_patch 0}} {
     set date [formatdate [lindex $info 4]]
     $ctext insert end "[mc "Committer"]: [lindex $info 3]  $date\n"
     if {[info exists idtags($id)]} {
-	$ctext insert end [mc "Tags:"]
-	foreach tag $idtags($id) {
-	    $ctext insert end " $tag"
-	}
-	$ctext insert end "\n"
+        $ctext insert end [mc "Tags:"]
+        foreach tag $idtags($id) {
+            $ctext insert end " $tag"
+        }
+        $ctext insert end "\n"
     }
 
     set headers {}
     set olds $parents($curview,$id)
     if {[llength $olds] > 1} {
-	set np 0
-	foreach p $olds {
-	    if {$np >= $mergemax} {
-		set tag mmax
-	    } else {
-		set tag m$np
-	    }
-	    $ctext insert end "[mc "Parent"]: " $tag
-	    appendwithlinks [commit_descriptor $p] {}
-	    incr np
-	}
+        set np 0
+        foreach p $olds {
+            if {$np >= $mergemax} {
+                set tag mmax
+            } else {
+                set tag m$np
+            }
+            $ctext insert end "[mc "Parent"]: " $tag
+            appendwithlinks [commit_descriptor $p] {}
+            incr np
+        }
     } else {
-	foreach p $olds {
-	    append headers "[mc "Parent"]: [commit_descriptor $p]"
-	}
+        foreach p $olds {
+            append headers "[mc "Parent"]: [commit_descriptor $p]"
+        }
     }
 
     foreach c $children($curview,$id) {
-	append headers "[mc "Child"]:  [commit_descriptor $c]"
+        append headers "[mc "Child"]:  [commit_descriptor $c]"
     }
 
     # make anything that looks like a SHA1 ID be a clickable link
     appendwithlinks $headers {}
     if {$showneartags} {
-	if {![info exists allcommits]} {
-	    getallcommits
-	}
-	$ctext insert end "[mc "Branch"]: "
-	$ctext mark set branch "end -1c"
-	$ctext mark gravity branch left
-	$ctext insert end "\n[mc "Follows"]: "
-	$ctext mark set follows "end -1c"
-	$ctext mark gravity follows left
-	$ctext insert end "\n[mc "Precedes"]: "
-	$ctext mark set precedes "end -1c"
-	$ctext mark gravity precedes left
-	$ctext insert end "\n"
-	dispneartags 1
+        if {![info exists allcommits]} {
+            getallcommits
+        }
+        $ctext insert end "[mc "Branch"]: "
+        $ctext mark set branch "end -1c"
+        $ctext mark gravity branch left
+        $ctext insert end "\n[mc "Follows"]: "
+        $ctext mark set follows "end -1c"
+        $ctext mark gravity follows left
+        $ctext insert end "\n[mc "Precedes"]: "
+        $ctext mark set precedes "end -1c"
+        $ctext mark gravity precedes left
+        $ctext insert end "\n"
+        dispneartags 1
     }
     $ctext insert end "\n"
     set comment [lindex $info 5]
     if {[string first "\r" $comment] >= 0} {
-	set comment [string map {"\r" "\n    "} $comment]
+        set comment [string map {"\r" "\n    "} $comment]
     }
     appendwithlinks $comment {comment}
 
@@ -7449,13 +7467,13 @@ proc selectline {l isnew {desired_loc {}} {switch_to_patch 0}} {
     set jump_to_here $desired_loc
     init_flist [mc "Comments"]
     if {$cmitmode eq "tree"} {
-	gettree $id
+        gettree $id
     } elseif {$vinlinediff($curview) == 1} {
-	showinlinediff $id
+        showinlinediff $id
     } elseif {[llength $olds] <= 1} {
-	startdiff $id
+        startdiff $id
     } else {
-	mergediff $id
+        mergediff $id
     }
 }
 
@@ -7485,14 +7503,14 @@ proc selnextpage {dir} {
 
     set lpp [expr {([winfo height $canv] - 2) / $linespc}]
     if {$lpp < 1} {
-	set lpp 1
+        set lpp 1
     }
     allcanvs yview scroll [expr {$dir * $lpp}] units
     drawvisible
     if {$selectedline eq {}} return
     set l [expr {$selectedline + $dir * $lpp}]
     if {$l < 0} {
-	set l 0
+        set l 0
     } elseif {$l >= $numcommits} {
         set l [expr $numcommits - 1]
     }
@@ -7513,7 +7531,7 @@ proc reselectline {} {
     global selectedline
 
     if {$selectedline ne {}} {
-	selectline $selectedline 0
+        selectline $selectedline 0
     }
 }
 
@@ -7524,20 +7542,20 @@ proc addtohistory {cmd {saveproc {}}} {
     save_position
     set elt [list $curview $cmd $saveproc {}]
     if {$historyindex > 0
-	&& [lindex $history [expr {$historyindex - 1}]] == $elt} {
-	return
+        && [lindex $history [expr {$historyindex - 1}]] == $elt} {
+        return
     }
 
     if {$historyindex < [llength $history]} {
-	set history [lreplace $history $historyindex end $elt]
+        set history [lreplace $history $historyindex end $elt]
     } else {
-	lappend history $elt
+        lappend history $elt
     }
     incr historyindex
     if {$historyindex > 1} {
-	.tf.bar.leftbut conf -state normal
+        .tf.bar.leftbut conf -state normal
     } else {
-	.tf.bar.leftbut conf -state disabled
+        .tf.bar.leftbut conf -state disabled
     }
     .tf.bar.rightbut conf -state disabled
 }
@@ -7550,7 +7568,7 @@ proc save_position {} {
     set hi [expr {$historyindex - 1}]
     set fn [lindex $history $hi 2]
     if {$fn ne {}} {
-	lset history $hi 3 [eval $fn]
+        lset history $hi 3 [eval $fn]
     }
 }
 
@@ -7558,11 +7576,11 @@ proc unset_posvars {} {
     global last_posvars
 
     if {[info exists last_posvars]} {
-	foreach {var val} $last_posvars {
-	    global $var
-	    unset -nocomplain $var
-	}
-	unset last_posvars
+        foreach {var val} $last_posvars {
+            global $var
+            unset -nocomplain $var
+        }
+        unset last_posvars
     }
 }
 
@@ -7573,12 +7591,12 @@ proc godo {elt} {
     set cmd [lindex $elt 1]
     set pv [lindex $elt 3]
     if {$curview != $view} {
-	showview $view
+        showview $view
     }
     unset_posvars
     foreach {var val} $pv {
-	global $var
-	set $var $val
+        global $var
+        set $var $val
     }
     set last_posvars $pv
     eval $cmd
@@ -7589,13 +7607,13 @@ proc goback {} {
     focus .
 
     if {$historyindex > 1} {
-	save_position
-	incr historyindex -1
-	godo [lindex $history [expr {$historyindex - 1}]]
-	.tf.bar.rightbut conf -state normal
+        save_position
+        incr historyindex -1
+        godo [lindex $history [expr {$historyindex - 1}]]
+        .tf.bar.rightbut conf -state normal
     }
     if {$historyindex <= 1} {
-	.tf.bar.leftbut conf -state disabled
+        .tf.bar.leftbut conf -state disabled
     }
 }
 
@@ -7604,14 +7622,14 @@ proc goforw {} {
     focus .
 
     if {$historyindex < [llength $history]} {
-	save_position
-	set cmd [lindex $history $historyindex]
-	incr historyindex
-	godo $cmd
-	.tf.bar.leftbut conf -state normal
+        save_position
+        set cmd [lindex $history $historyindex]
+        incr historyindex
+        godo $cmd
+        .tf.bar.leftbut conf -state normal
     }
     if {$historyindex >= [llength $history]} {
-	.tf.bar.rightbut conf -state disabled
+        .tf.bar.rightbut conf -state disabled
     }
 }
 
@@ -7619,7 +7637,7 @@ proc go_to_parent {i} {
     global parents curview targetid
     set ps $parents($curview,$targetid)
     if {[llength $ps] >= $i} {
-	selbyid [lindex $ps [expr $i - 1]]
+        selbyid [lindex $ps [expr $i - 1]]
     }
 }
 
@@ -7630,25 +7648,25 @@ proc gettree {id} {
     set diffids $id
     unset -nocomplain diffmergeid
     if {![info exists treefilelist($id)]} {
-	if {![info exists treepending]} {
-	    if {$id eq $nullid} {
-		set cmd [list | git ls-files]
-	    } elseif {$id eq $nullid2} {
-		set cmd [list | git ls-files --stage -t]
-	    } else {
-		set cmd [list | git ls-tree -r $id]
-	    }
-	    if {[catch {set gtf [open $cmd r]}]} {
-		return
-	    }
-	    set treepending $id
-	    set treefilelist($id) {}
-	    set treeidlist($id) {}
-	    fconfigure $gtf -blocking 0 -encoding binary
-	    filerun $gtf [list gettreeline $gtf $id]
-	}
+        if {![info exists treepending]} {
+            if {$id eq $nullid} {
+                set cmd [list | git ls-files]
+            } elseif {$id eq $nullid2} {
+                set cmd [list | git ls-files --stage -t]
+            } else {
+                set cmd [list | git ls-tree -r $id]
+            }
+            if {[catch {set gtf [open $cmd r]}]} {
+                return
+            }
+            set treepending $id
+            set treefilelist($id) {}
+            set treeidlist($id) {}
+            fconfigure $gtf -blocking 0 -encoding binary
+            filerun $gtf [list gettreeline $gtf $id]
+        }
     } else {
-	setfilelist $id
+        setfilelist $id
     }
 }
 
@@ -7657,36 +7675,36 @@ proc gettreeline {gtf id} {
 
     set nl 0
     while {[incr nl] <= 1000 && [gets $gtf line] >= 0} {
-	if {$diffids eq $nullid} {
-	    set fname $line
-	} else {
-	    set i [string first "\t" $line]
-	    if {$i < 0} continue
-	    set fname [string range $line [expr {$i+1}] end]
-	    set line [string range $line 0 [expr {$i-1}]]
-	    if {$diffids ne $nullid2 && [lindex $line 1] ne "blob"} continue
-	    set sha1 [lindex $line 2]
-	    lappend treeidlist($id) $sha1
-	}
-	if {[string index $fname 0] eq "\""} {
-	    set fname [lindex $fname 0]
-	}
-	set fname [encoding convertfrom $fname]
-	lappend treefilelist($id) $fname
+        if {$diffids eq $nullid} {
+            set fname $line
+        } else {
+            set i [string first "\t" $line]
+            if {$i < 0} continue
+            set fname [string range $line [expr {$i+1}] end]
+            set line [string range $line 0 [expr {$i-1}]]
+            if {$diffids ne $nullid2 && [lindex $line 1] ne "blob"} continue
+            set sha1 [lindex $line 2]
+            lappend treeidlist($id) $sha1
+        }
+        if {[string index $fname 0] eq "\""} {
+            set fname [lindex $fname 0]
+        }
+        set fname [encoding convertfrom $fname]
+        lappend treefilelist($id) $fname
     }
     if {![eof $gtf]} {
-	return [expr {$nl >= 1000? 2: 1}]
+        return [expr {$nl >= 1000? 2: 1}]
     }
     close $gtf
     unset treepending
     if {$cmitmode ne "tree"} {
-	if {![info exists diffmergeid]} {
-	    gettreediffs $diffids
-	}
+        if {![info exists diffmergeid]} {
+            gettreediffs $diffids
+        }
     } elseif {$id ne $diffids} {
-	gettree $diffids
+        gettree $diffids
     } else {
-	setfilelist $id
+        setfilelist $id
     }
     return 0
 }
@@ -7698,20 +7716,20 @@ proc showfile {f} {
 
     set i [lsearch -exact $treefilelist($diffids) $f]
     if {$i < 0} {
-	puts "oops, $f not in list for id $diffids"
-	return
+        puts "oops, $f not in list for id $diffids"
+        return
     }
     if {$diffids eq $nullid} {
-	if {[catch {set bf [open $f r]} err]} {
-	    puts "oops, can't read $f: $err"
-	    return
-	}
+        if {[catch {set bf [open $f r]} err]} {
+            puts "oops, can't read $f: $err"
+            return
+        }
     } else {
-	set blob [lindex $treeidlist($diffids) $i]
-	if {[catch {set bf [open [concat | git cat-file blob $blob] r]} err]} {
-	    puts "oops, error reading blob $blob: $err"
-	    return
-	}
+        set blob [lindex $treeidlist($diffids) $i]
+        if {[catch {set bf [open [concat | git cat-file blob $blob] r]} err]} {
+            puts "oops, error reading blob $blob: $err"
+            return
+        }
     }
     fconfigure $bf -blocking 0 -encoding [get_path_encoding $f]
     filerun $bf [list getblobline $bf $diffids]
@@ -7730,28 +7748,28 @@ proc getblobline {bf id} {
     global diffids cmitmode ctext
 
     if {$id ne $diffids || $cmitmode ne "tree"} {
-	catch {close $bf}
-	return 0
+        catch {close $bf}
+        return 0
     }
     $ctext config -state normal
     set nl 0
     while {[incr nl] <= 1000 && [gets $bf line] >= 0} {
-	$ctext insert end "$line\n"
+        $ctext insert end "$line\n"
     }
     if {[eof $bf]} {
-	global jump_to_here ctext_file_names commentend
+        global jump_to_here ctext_file_names commentend
 
-	# delete last newline
-	$ctext delete "end - 2c" "end - 1c"
-	close $bf
-	if {$jump_to_here ne {} &&
-	    [lindex $jump_to_here 0] eq [lindex $ctext_file_names 0]} {
-	    set lnum [expr {[lindex $jump_to_here 1] +
-			    [lindex [split $commentend .] 0]}]
-	    mark_ctext_line $lnum
-	}
-	$ctext config -state disabled
-	return 0
+        # delete last newline
+        $ctext delete "end - 2c" "end - 1c"
+        close $bf
+        if {$jump_to_here ne {} &&
+            [lindex $jump_to_here 0] eq [lindex $ctext_file_names 0]} {
+            set lnum [expr {[lindex $jump_to_here 1] +
+                            [lindex [split $commentend .] 0]}]
+            mark_ctext_line $lnum
+        }
+        $ctext config -state disabled
+        return 0
     }
     $ctext config -state disabled
     return [expr {$nl >= 1000? 2: 1}]
@@ -7786,13 +7804,13 @@ proc startdiff {ids} {
     set diffids $ids
     unset -nocomplain diffmergeid
     if {![info exists treediffs($ids)] ||
-	[lsearch -exact $ids $nullid] >= 0 ||
-	[lsearch -exact $ids $nullid2] >= 0} {
-	if {![info exists treepending]} {
-	    gettreediffs $ids
-	}
+        [lsearch -exact $ids $nullid] >= 0 ||
+        [lsearch -exact $ids $nullid2] >= 0} {
+        if {![info exists treepending]} {
+            gettreediffs $ids
+        }
     } else {
-	addtocflist $ids
+        addtocflist $ids
     }
 }
 
@@ -7809,13 +7827,13 @@ proc showinlinediff {ids} {
 
     set inhdr 0
     foreach line $difflines {
-	if {![string compare -length 5 "diff " $line]} {
-	    set inhdr 1
-	} elseif {$inhdr && ![string compare -length 4 "+++ " $line]} {
-	    # offset also accounts for the b/ prefix
-	    lappend treediff [string range $line 6 end]
-	    set inhdr 0
-	}
+        if {![string compare -length 5 "diff " $line]} {
+            set inhdr 1
+        } elseif {$inhdr && ![string compare -length 4 "+++ " $line]} {
+            # offset also accounts for the b/ prefix
+            lappend treediff [string range $line 6 end]
+            set inhdr 0
+        }
     }
 
     set treediffs($ids) $treediff
@@ -7823,7 +7841,7 @@ proc showinlinediff {ids} {
 
     $ctext conf -state normal
     foreach line $difflines {
-	parseblobdiffline $ids $line
+        parseblobdiffline $ids $line
     }
     maybe_scroll_ctext 1
     $ctext conf -state disabled
@@ -7834,11 +7852,11 @@ proc showinlinediff {ids} {
 proc path_filter {filter name} {
     set worktree [gitworktree]
     foreach p $filter {
-	set fq_p [file normalize $p]
-	set fq_n [file normalize [file join $worktree $name]]
-	if {[string match [file normalize $fq_p]* $fq_n]} {
-	    return 1
-	}
+        set fq_p [file normalize $p]
+        set fq_n [file normalize [file join $worktree $name]]
+        if {[string match [file normalize $fq_p]* $fq_n]} {
+            return 1
+        }
     }
     return 0
 }
@@ -7856,42 +7874,42 @@ proc diffcmd {ids flags} {
     set i [lsearch -exact $ids $nullid]
     set j [lsearch -exact $ids $nullid2]
     if {$i >= 0} {
-	if {[llength $ids] > 1 && $j < 0} {
-	    # comparing working directory with some specific revision
-	    set cmd [concat | git diff-index $flags]
-	    if {$i == 0} {
-		lappend cmd -R [lindex $ids 1]
-	    } else {
-		lappend cmd [lindex $ids 0]
-	    }
-	} else {
-	    # comparing working directory with index
-	    set cmd [concat | git diff-files $flags]
-	    if {$j == 1} {
-		lappend cmd -R
-	    }
-	}
+        if {[llength $ids] > 1 && $j < 0} {
+            # comparing working directory with some specific revision
+            set cmd [concat | git diff-index $flags]
+            if {$i == 0} {
+                lappend cmd -R [lindex $ids 1]
+            } else {
+                lappend cmd [lindex $ids 0]
+            }
+        } else {
+            # comparing working directory with index
+            set cmd [concat | git diff-files $flags]
+            if {$j == 1} {
+                lappend cmd -R
+            }
+        }
     } elseif {$j >= 0} {
-	if {[package vcompare $git_version "1.7.2"] >= 0} {
-	    set flags "$flags --ignore-submodules=dirty"
-	}
-	set cmd [concat | git diff-index --cached $flags]
-	if {[llength $ids] > 1} {
-	    # comparing index with specific revision
-	    if {$j == 0} {
-		lappend cmd -R [lindex $ids 1]
-	    } else {
-		lappend cmd [lindex $ids 0]
-	    }
-	} else {
-	    # comparing index with HEAD
-	    lappend cmd HEAD
-	}
+        if {[package vcompare $git_version "1.7.2"] >= 0} {
+            set flags "$flags --ignore-submodules=dirty"
+        }
+        set cmd [concat | git diff-index --cached $flags]
+        if {[llength $ids] > 1} {
+            # comparing index with specific revision
+            if {$j == 0} {
+                lappend cmd -R [lindex $ids 1]
+            } else {
+                lappend cmd [lindex $ids 0]
+            }
+        } else {
+            # comparing index with HEAD
+            lappend cmd HEAD
+        }
     } else {
-	if {$log_showroot} {
-	    lappend flags --root
-	}
-	set cmd [concat | git diff-tree -r $flags $ids]
+        if {$log_showroot} {
+            lappend flags --root
+        }
+        set cmd [concat | git diff-tree -r $flags $ids]
     }
     return $cmd
 }
@@ -7901,7 +7919,7 @@ proc gettreediffs {ids} {
 
     set cmd [diffcmd $ids {--no-commit-id}]
     if {$limitdiffs && $vfilelimit($curview) ne {}} {
-	    set cmd [concat $cmd -- $vfilelimit($curview)]
+            set cmd [concat $cmd -- $vfilelimit($curview)]
     }
     if {[catch {set gdtf [open $cmd r]}]} return
 
@@ -7919,44 +7937,44 @@ proc gettreediffline {gdtf ids} {
     set sublist {}
     set max 1000
     if {$perfile_attrs} {
-	# cache_gitattr is slow, and even slower on win32 where we
-	# have to invoke it for only about 30 paths at a time
-	set max 500
-	if {[tk windowingsystem] == "win32"} {
-	    set max 120
-	}
+        # cache_gitattr is slow, and even slower on win32 where we
+        # have to invoke it for only about 30 paths at a time
+        set max 500
+        if {[tk windowingsystem] == "win32"} {
+            set max 120
+        }
     }
     while {[incr nr] <= $max && [gets $gdtf line] >= 0} {
-	set i [string first "\t" $line]
-	if {$i >= 0} {
-	    set file [string range $line [expr {$i+1}] end]
-	    if {[string index $file 0] eq "\""} {
-		set file [lindex $file 0]
-	    }
-	    set file [encoding convertfrom $file]
-	    if {$file ne [lindex $treediff end]} {
-		lappend treediff $file
-		lappend sublist $file
-	    }
-	}
+        set i [string first "\t" $line]
+        if {$i >= 0} {
+            set file [string range $line [expr {$i+1}] end]
+            if {[string index $file 0] eq "\""} {
+                set file [lindex $file 0]
+            }
+            set file [encoding convertfrom $file]
+            if {$file ne [lindex $treediff end]} {
+                lappend treediff $file
+                lappend sublist $file
+            }
+        }
     }
     if {$perfile_attrs} {
-	cache_gitattr encoding $sublist
+        cache_gitattr encoding $sublist
     }
     if {![eof $gdtf]} {
-	return [expr {$nr >= $max? 2: 1}]
+        return [expr {$nr >= $max? 2: 1}]
     }
     close $gdtf
     set treediffs($ids) $treediff
     unset treepending
     if {$cmitmode eq "tree" && [llength $diffids] == 1} {
-	gettree $diffids
+        gettree $diffids
     } elseif {$ids != $diffids} {
-	if {![info exists diffmergeid]} {
-	    gettreediffs $diffids
-	}
+        if {![info exists diffmergeid]} {
+            gettreediffs $diffids
+        }
     } else {
-	addtocflist $ids
+        addtocflist $ids
     }
     return 0
 }
@@ -7970,10 +7988,10 @@ proc diffcontextchange {n1 n2 op} {
     global diffcontextstring diffcontext
 
     if {[string is integer -strict $diffcontextstring]} {
-	if {$diffcontextstring >= 0} {
-	    set diffcontext $diffcontextstring
-	    reselectline
-	}
+        if {$diffcontextstring >= 0} {
+            set diffcontext $diffcontextstring
+            reselectline
+        }
     }
 }
 
@@ -8007,25 +8025,25 @@ proc getblobdiffs {ids} {
 
     set textconv {}
     if {[package vcompare $git_version "1.6.1"] >= 0} {
-	set textconv "--textconv"
+        set textconv "--textconv"
     }
     set submodule {}
     if {[package vcompare $git_version "1.6.6"] >= 0} {
-	set submodule "--submodule"
+        set submodule "--submodule"
     }
     set cmd [diffcmd $ids "-p $textconv $submodule  -C --cc --no-commit-id -U$diffcontext"]
     if {$ignorespace} {
-	append cmd " -w"
+        append cmd " -w"
     }
     if {$worddiff ne [mc "Line diff"]} {
-	append cmd " --word-diff=porcelain"
+        append cmd " --word-diff=porcelain"
     }
     if {$limitdiffs && $vfilelimit($curview) ne {}} {
-	set cmd [concat $cmd -- $vfilelimit($curview)]
+        set cmd [concat $cmd -- $vfilelimit($curview)]
     }
     if {[catch {set bdf [open $cmd r]} err]} {
-	error_popup [mc "Error getting diffs: %s" $err]
-	return
+        error_popup [mc "Error getting diffs: %s" $err]
+        return
     }
     fconfigure $bdf -blocking 0 -encoding binary -eofchar {}
     set blobdifffd($ids) $bdf
@@ -8037,7 +8055,7 @@ proc savecmitpos {} {
     global ctext cmitmode
 
     if {$cmitmode eq "tree"} {
-	return {}
+        return {}
     }
     return [list target_scrollpos [$ctext index @0,0]]
 }
@@ -8053,9 +8071,9 @@ proc maybe_scroll_ctext {ateof} {
 
     if {![info exists target_scrollpos]} return
     if {!$ateof} {
-	set nlines [expr {[winfo height $ctext]
-			  / [font metrics textfont -linespace]}]
-	if {[$ctext compare "$target_scrollpos + $nlines lines" <= end]} return
+        set nlines [expr {[winfo height $ctext]
+                          / [font metrics textfont -linespace]}]
+        if {[$ctext compare "$target_scrollpos + $nlines lines" <= end]} return
     }
     $ctext yview $target_scrollpos
     unset target_scrollpos
@@ -8065,12 +8083,12 @@ proc setinlist {var i val} {
     global $var
 
     while {[llength [set $var]] < $i} {
-	lappend $var {}
+        lappend $var {}
     }
     if {[llength [set $var]] == $i} {
-	lappend $var $val
+        lappend $var $val
     } else {
-	lset $var $i $val
+        lset $var $i $val
     }
 }
 
@@ -8082,7 +8100,7 @@ proc makediffhdr {fname ids} {
     set diffencoding [get_path_encoding $fname]
     set i [lsearch -exact $treediffs($ids) $fname]
     if {$i >= 0} {
-	setinlist difffilestart $i $curdiffstart
+        setinlist difffilestart $i $curdiffstart
     }
     lset ctext_file_names end $fname
     set l [expr {(78 - [string length $fname]) / 2}]
@@ -8090,7 +8108,7 @@ proc makediffhdr {fname ids} {
     $ctext insert $curdiffstart "$pad $fname $pad" filesep
     set targetline {}
     if {$jump_to_here ne {} && [lindex $jump_to_here 0] eq $fname} {
-	set targetline [lindex $jump_to_here 1]
+        set targetline [lindex $jump_to_here 1]
     }
     set diffline 0
 }
@@ -8098,7 +8116,7 @@ proc makediffhdr {fname ids} {
 proc blobdiffmaybeseehere {ateof} {
     global diffseehere
     if {$diffseehere >= 0} {
-	mark_ctext_line [lindex [split $diffseehere .] 0]
+        mark_ctext_line [lindex [split $diffseehere .] 0]
     }
     maybe_scroll_ctext $ateof
 }
@@ -8110,22 +8128,22 @@ proc getblobdiffline {bdf ids} {
     set nr 0
     $ctext conf -state normal
     while {[incr nr] <= 1000 && [gets $bdf line] >= 0} {
-	if {$ids != $diffids || $bdf != $blobdifffd($ids)} {
-	    # Older diff read. Abort it.
-	    catch {close $bdf}
-	    if {$ids != $diffids} {
-		array unset blobdifffd $ids
-	    }
-	    return 0
-	}
-	parseblobdiffline $ids $line
+        if {$ids != $diffids || $bdf != $blobdifffd($ids)} {
+            # Older diff read. Abort it.
+            catch {close $bdf}
+            if {$ids != $diffids} {
+                array unset blobdifffd $ids
+            }
+            return 0
+        }
+        parseblobdiffline $ids $line
     }
     $ctext conf -state disabled
     blobdiffmaybeseehere [eof $bdf]
     if {[eof $bdf]} {
-	catch {close $bdf}
-	array unset blobdifffd $ids
-	return 0
+        catch {close $bdf}
+        array unset blobdifffd $ids
+        return 0
     }
     return [expr {$nr >= 1000? 2: 1}]
 }
@@ -8139,199 +8157,199 @@ proc parseblobdiffline {ids line} {
     global worddiff diffseehere
 
     if {![string compare -length 5 "diff " $line]} {
-	if {![regexp {^diff (--cc|--git) } $line m type]} {
-	    set line [encoding convertfrom $line]
-	    $ctext insert end "$line\n" hunksep
-	    continue
-	}
-	# start of a new file
-	set diffinhdr 1
-	$ctext insert end "\n"
-	set curdiffstart [$ctext index "end - 1c"]
-	lappend ctext_file_names ""
-	lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
-	$ctext insert end "\n" filesep
+        if {![regexp {^diff (--cc|--git) } $line m type]} {
+            set line [encoding convertfrom $line]
+            $ctext insert end "$line\n" hunksep
+            continue
+        }
+        # start of a new file
+        set diffinhdr 1
+        set currdiffsubmod ""
 
-	if {$type eq "--cc"} {
-	    # start of a new file in a merge diff
-	    set fname [string range $line 10 end]
-	    if {[lsearch -exact $treediffs($ids) $fname] < 0} {
-		lappend treediffs($ids) $fname
-		add_flist [list $fname]
-	    }
+        $ctext insert end "\n"
+        set curdiffstart [$ctext index "end - 1c"]
+        lappend ctext_file_names ""
+        lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
+        $ctext insert end "\n" filesep
 
-	} else {
-	    set line [string range $line 11 end]
-	    # If the name hasn't changed the length will be odd,
-	    # the middle char will be a space, and the two bits either
-	    # side will be a/name and b/name, or "a/name" and "b/name".
-	    # If the name has changed we'll get "rename from" and
-	    # "rename to" or "copy from" and "copy to" lines following
-	    # this, and we'll use them to get the filenames.
-	    # This complexity is necessary because spaces in the
-	    # filename(s) don't get escaped.
-	    set l [string length $line]
-	    set i [expr {$l / 2}]
-	    if {!(($l & 1) && [string index $line $i] eq " " &&
-		  [string range $line 2 [expr {$i - 1}]] eq \
-		      [string range $line [expr {$i + 3}] end])} {
-		return
-	    }
-	    # unescape if quoted and chop off the a/ from the front
-	    if {[string index $line 0] eq "\""} {
-		set fname [string range [lindex $line 0] 2 end]
-	    } else {
-		set fname [string range $line 2 [expr {$i - 1}]]
-	    }
-	}
-	makediffhdr $fname $ids
+        if {$type eq "--cc"} {
+            # start of a new file in a merge diff
+            set fname [string range $line 10 end]
+            if {[lsearch -exact $treediffs($ids) $fname] < 0} {
+                lappend treediffs($ids) $fname
+                add_flist [list $fname]
+            }
+
+        } else {
+            set line [string range $line 11 end]
+            # If the name hasn't changed the length will be odd,
+            # the middle char will be a space, and the two bits either
+            # side will be a/name and b/name, or "a/name" and "b/name".
+            # If the name has changed we'll get "rename from" and
+            # "rename to" or "copy from" and "copy to" lines following
+            # this, and we'll use them to get the filenames.
+            # This complexity is necessary because spaces in the
+            # filename(s) don't get escaped.
+            set l [string length $line]
+            set i [expr {$l / 2}]
+            if {!(($l & 1) && [string index $line $i] eq " " &&
+                  [string range $line 2 [expr {$i - 1}]] eq \
+                      [string range $line [expr {$i + 3}] end])} {
+                return
+            }
+            # unescape if quoted and chop off the a/ from the front
+            if {[string index $line 0] eq "\""} {
+                set fname [string range [lindex $line 0] 2 end]
+            } else {
+                set fname [string range $line 2 [expr {$i - 1}]]
+            }
+        }
+        makediffhdr $fname $ids
 
     } elseif {![string compare -length 16 "* Unmerged path " $line]} {
-	set fname [encoding convertfrom [string range $line 16 end]]
-	$ctext insert end "\n"
-	set curdiffstart [$ctext index "end - 1c"]
-	lappend ctext_file_names $fname
-	lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
-	$ctext insert end "$line\n" filesep
-	set i [lsearch -exact $treediffs($ids) $fname]
-	if {$i >= 0} {
-	    setinlist difffilestart $i $curdiffstart
-	}
+        set fname [encoding convertfrom [string range $line 16 end]]
+        $ctext insert end "\n"
+        set curdiffstart [$ctext index "end - 1c"]
+        lappend ctext_file_names $fname
+        lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
+        $ctext insert end "$line\n" filesep
+        set i [lsearch -exact $treediffs($ids) $fname]
+        if {$i >= 0} {
+            setinlist difffilestart $i $curdiffstart
+        }
 
     } elseif {![string compare -length 2 "@@" $line]} {
-	regexp {^@@+} $line ats
-	set line [encoding convertfrom $diffencoding $line]
-	$ctext insert end "$line\n" hunksep
-	if {[regexp { \+(\d+),\d+ @@} $line m nl]} {
-	    set diffline $nl
-	}
-	set diffnparents [expr {[string length $ats] - 1}]
-	set diffinhdr 0
+        regexp {^@@+} $line ats
+        set line [encoding convertfrom $diffencoding $line]
+        $ctext insert end "$line\n" hunksep
+        if {[regexp { \+(\d+),\d+ @@} $line m nl]} {
+            set diffline $nl
+        }
+        set diffnparents [expr {[string length $ats] - 1}]
+        set diffinhdr 0
 
     } elseif {![string compare -length 10 "Submodule " $line]} {
-	# start of a new submodule
-	if {[regexp -indices "\[0-9a-f\]+\\.\\." $line nameend]} {
-	    set fname [string range $line 10 [expr [lindex $nameend 0] - 2]]
-	} else {
-	    set fname [string range $line 10 [expr [string first "contains " $line] - 2]]
-	}
-	if {$currdiffsubmod != $fname} {
-	    $ctext insert end "\n";     # Add newline after commit message
-	}
-	set curdiffstart [$ctext index "end - 1c"]
-	lappend ctext_file_names ""
-	if {$currdiffsubmod != $fname} {
-	    lappend ctext_file_lines $fname
-	    makediffhdr $fname $ids
-	    set currdiffsubmod $fname
-	    $ctext insert end "\n$line\n" filesep
-	} else {
-	    $ctext insert end "$line\n" filesep
-	}
+        # start of a new submodule
+        if {[regexp -indices "\[0-9a-f\]+\\.\\." $line nameend]} {
+            set fname [string range $line 10 [expr [lindex $nameend 0] - 2]]
+        } else {
+            set fname [string range $line 10 [expr [string first "contains " $line] - 2]]
+        }
+        if {$currdiffsubmod != $fname} {
+            $ctext insert end "\n";     # Add newline after commit message
+        }
+        if {$currdiffsubmod != $fname} {
+            set curdiffstart [$ctext index "end - 1c"]
+            lappend ctext_file_names ""
+            lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
+            makediffhdr $fname $ids
+            set currdiffsubmod $fname
+            $ctext insert end "\n$line\n" filesep
+        } else {
+            $ctext insert end "$line\n" filesep
+        }
     } elseif {$currdiffsubmod != "" && ![string compare -length 3 "  >" $line]} {
-	set $currdiffsubmod ""
-	set line [encoding convertfrom $diffencoding $line]
-	$ctext insert end "$line\n" dresult
+        set line [encoding convertfrom $diffencoding $line]
+        $ctext insert end "$line\n" dresult
     } elseif {$currdiffsubmod != "" && ![string compare -length 3 "  <" $line]} {
-	set $currdiffsubmod ""
-	set line [encoding convertfrom $diffencoding $line]
-	$ctext insert end "$line\n" d0
+        set line [encoding convertfrom $diffencoding $line]
+        $ctext insert end "$line\n" d0
     } elseif {$diffinhdr} {
-	if {![string compare -length 12 "rename from " $line]} {
-	    set fname [string range $line [expr 6 + [string first " from " $line] ] end]
-	    if {[string index $fname 0] eq "\""} {
-		set fname [lindex $fname 0]
-	    }
-	    set fname [encoding convertfrom $fname]
-	    set i [lsearch -exact $treediffs($ids) $fname]
-	    if {$i >= 0} {
-		setinlist difffilestart $i $curdiffstart
-	    }
-	} elseif {![string compare -length 10 $line "rename to "] ||
-		  ![string compare -length 8 $line "copy to "]} {
-	    set fname [string range $line [expr 4 + [string first " to " $line] ] end]
-	    if {[string index $fname 0] eq "\""} {
-		set fname [lindex $fname 0]
-	    }
-	    makediffhdr $fname $ids
-	} elseif {[string compare -length 3 $line "---"] == 0} {
-	    # do nothing
-	    return
-	} elseif {[string compare -length 3 $line "+++"] == 0} {
-	    set diffinhdr 0
-	    return
-	}
-	$ctext insert end "$line\n" filesep
+        if {![string compare -length 12 "rename from " $line]} {
+            set fname [string range $line [expr 6 + [string first " from " $line] ] end]
+            if {[string index $fname 0] eq "\""} {
+                set fname [lindex $fname 0]
+            }
+            set fname [encoding convertfrom $fname]
+            set i [lsearch -exact $treediffs($ids) $fname]
+            if {$i >= 0} {
+                setinlist difffilestart $i $curdiffstart
+            }
+        } elseif {![string compare -length 10 $line "rename to "] ||
+                  ![string compare -length 8 $line "copy to "]} {
+            set fname [string range $line [expr 4 + [string first " to " $line] ] end]
+            if {[string index $fname 0] eq "\""} {
+                set fname [lindex $fname 0]
+            }
+            makediffhdr $fname $ids
+        } elseif {[string compare -length 3 $line "---"] == 0} {
+            # do nothing
+            return
+        } elseif {[string compare -length 3 $line "+++"] == 0} {
+            set diffinhdr 0
+            return
+        }
+        $ctext insert end "$line\n" filesep
 
     } else {
-	set line [string map {\x1A ^Z} \
-		      [encoding convertfrom $diffencoding $line]]
-	# parse the prefix - one ' ', '-' or '+' for each parent
-	set prefix [string range $line 0 [expr {$diffnparents - 1}]]
-	set tag [expr {$diffnparents > 1? "m": "d"}]
-	set dowords [expr {$worddiff ne [mc "Line diff"] && $diffnparents == 1}]
-	set words_pre_markup ""
-	set words_post_markup ""
-	if {[string trim $prefix " -+"] eq {}} {
-	    # prefix only has " ", "-" and "+" in it: normal diff line
-	    set num [string first "-" $prefix]
-	    if {$dowords} {
-		set line [string range $line 1 end]
-	    }
-	    if {$num >= 0} {
-		# removed line, first parent with line is $num
-		if {$num >= $mergemax} {
-		    set num "max"
-		}
-		if {$dowords && $worddiff eq [mc "Markup words"]} {
-		    $ctext insert end "\[-$line-\]" $tag$num
-		} else {
-		    $ctext insert end "$line" $tag$num
-		}
-		if {!$dowords} {
-		    $ctext insert end "\n" $tag$num
-		}
-	    } else {
-		set tags {}
-		if {[string first "+" $prefix] >= 0} {
-		    # added line
-		    lappend tags ${tag}result
-		    if {$diffnparents > 1} {
-			set num [string first " " $prefix]
-			if {$num >= 0} {
-			    if {$num >= $mergemax} {
-				set num "max"
-			    }
-			    lappend tags m$num
-			}
-		    }
-		    set words_pre_markup "{+"
-		    set words_post_markup "+}"
-		}
-		if {$targetline ne {}} {
-		    if {$diffline == $targetline} {
-			set diffseehere [$ctext index "end - 1 chars"]
-			set targetline {}
-		    } else {
-			incr diffline
-		    }
-		}
-		if {$dowords && $worddiff eq [mc "Markup words"]} {
-		    $ctext insert end "$words_pre_markup$line$words_post_markup" $tags
-		} else {
-		    $ctext insert end "$line" $tags
-		}
-		if {!$dowords} {
-		    $ctext insert end "\n" $tags
-		}
-	    }
-	} elseif {$dowords && $prefix eq "~"} {
-	    $ctext insert end "\n" {}
-	} else {
-	    # "\ No newline at end of file",
-	    # or something else we don't recognize
-	    $ctext insert end "$line\n" hunksep
-	}
+        set line [string map {\x1A ^Z} \
+                      [encoding convertfrom $diffencoding $line]]
+        # parse the prefix - one ' ', '-' or '+' for each parent
+        set prefix [string range $line 0 [expr {$diffnparents - 1}]]
+        set tag [expr {$diffnparents > 1? "m": "d"}]
+        set dowords [expr {$worddiff ne [mc "Line diff"] && $diffnparents == 1}]
+        set words_pre_markup ""
+        set words_post_markup ""
+        if {[string trim $prefix " -+"] eq {}} {
+            # prefix only has " ", "-" and "+" in it: normal diff line
+            set num [string first "-" $prefix]
+            if {$dowords} {
+                set line [string range $line 1 end]
+            }
+            if {$num >= 0} {
+                # removed line, first parent with line is $num
+                if {$num >= $mergemax} {
+                    set num "max"
+                }
+                if {$dowords && $worddiff eq [mc "Markup words"]} {
+                    $ctext insert end "\[-$line-\]" $tag$num
+                } else {
+                    $ctext insert end "$line" $tag$num
+                }
+                if {!$dowords} {
+                    $ctext insert end "\n" $tag$num
+                }
+            } else {
+                set tags {}
+                if {[string first "+" $prefix] >= 0} {
+                    # added line
+                    lappend tags ${tag}result
+                    if {$diffnparents > 1} {
+                        set num [string first " " $prefix]
+                        if {$num >= 0} {
+                            if {$num >= $mergemax} {
+                                set num "max"
+                            }
+                            lappend tags m$num
+                        }
+                    }
+                    set words_pre_markup "{+"
+                    set words_post_markup "+}"
+                }
+                if {$targetline ne {}} {
+                    if {$diffline == $targetline} {
+                        set diffseehere [$ctext index "end - 1 chars"]
+                        set targetline {}
+                    } else {
+                        incr diffline
+                    }
+                }
+                if {$dowords && $worddiff eq [mc "Markup words"]} {
+                    $ctext insert end "$words_pre_markup$line$words_post_markup" $tags
+                } else {
+                    $ctext insert end "$line" $tags
+                }
+                if {!$dowords} {
+                    $ctext insert end "\n" $tags
+                }
+            }
+        } elseif {$dowords && $prefix eq "~"} {
+            $ctext insert end "\n" {}
+        } else {
+            # "\ No newline at end of file",
+            # or something else we don't recognize
+            $ctext insert end "$line\n" hunksep
+        }
     }
 }
 
@@ -8361,9 +8379,9 @@ proc highlightfile_for_scrollpos {topidx} {
 
     set top [lindex [split $topidx .] 0]
     if {$difffilestart eq {} || $top < [lindex $difffilestart 0]} {
-	highlightfile 0
+        highlightfile 0
     } else {
-	highlightfile [expr {[bsearch $difffilestart $top] + 2}]
+        highlightfile [expr {[bsearch $difffilestart $top] + 2}]
     }
 }
 
@@ -8374,11 +8392,11 @@ proc prevfile {} {
     set prev 0.0
     set here [$ctext index @0,0]
     foreach loc $difffilestart {
-	if {[$ctext compare $loc >= $here]} {
-	    $ctext yview $prev
-	    return
-	}
-	set prev $loc
+        if {[$ctext compare $loc >= $here]} {
+            $ctext yview $prev
+            return
+        }
+        set prev $loc
     }
     $ctext yview $prev
 }
@@ -8389,10 +8407,10 @@ proc nextfile {} {
     if {$cmitmode eq "tree"} return
     set here [$ctext index @0,0]
     foreach loc $difffilestart {
-	if {[$ctext compare $loc > $here]} {
-	    $ctext yview $loc
-	    return
-	}
+        if {[$ctext compare $loc > $here]} {
+            $ctext yview $loc
+            return
+        }
     }
 }
 
@@ -8403,14 +8421,14 @@ proc clear_ctext {{first 1.0}} {
 
     set l [lindex [split $first .] 0]
     if {![info exists smarktop] || [$ctext compare $first < $smarktop.0]} {
-	set smarktop $l
+        set smarktop $l
     }
     if {![info exists smarkbot] || [$ctext compare $first < $smarkbot.0]} {
-	set smarkbot $l
+        set smarkbot $l
     }
     $ctext delete $first end
     if {$first eq "1.0"} {
-	unset -nocomplain pendinglinks
+        unset -nocomplain pendinglinks
     }
     set ctext_file_names {}
     set ctext_file_lines {}
@@ -8420,16 +8438,16 @@ proc settabs {{firstab {}}} {
     global firsttabstop tabstop ctext have_tk85
 
     if {$firstab ne {} && $have_tk85} {
-	set firsttabstop $firstab
+        set firsttabstop $firstab
     }
     set w [font measure textfont "0"]
     if {$firsttabstop != 0} {
-	$ctext conf -tabs [list [expr {($firsttabstop + $tabstop) * $w}] \
-			       [expr {($firsttabstop + 2 * $tabstop) * $w}]]
+        $ctext conf -tabs [list [expr {($firsttabstop + $tabstop) * $w}] \
+                               [expr {($firsttabstop + 2 * $tabstop) * $w}]]
     } elseif {$have_tk85 || $tabstop != 8} {
-	$ctext conf -tabs [expr {$tabstop * $w}]
+        $ctext conf -tabs [expr {$tabstop * $w}]
     } else {
-	$ctext conf -tabs {}
+        $ctext conf -tabs {}
     }
 }
 
@@ -8437,26 +8455,26 @@ proc incrsearch {name ix op} {
     global ctext searchstring searchdirn
 
     if {[catch {$ctext index anchor}]} {
-	# no anchor set, use start of selection, or of visible area
-	set sel [$ctext tag ranges sel]
-	if {$sel ne {}} {
-	    $ctext mark set anchor [lindex $sel 0]
-	} elseif {$searchdirn eq "-forwards"} {
-	    $ctext mark set anchor @0,0
-	} else {
-	    $ctext mark set anchor @0,[winfo height $ctext]
-	}
+        # no anchor set, use start of selection, or of visible area
+        set sel [$ctext tag ranges sel]
+        if {$sel ne {}} {
+            $ctext mark set anchor [lindex $sel 0]
+        } elseif {$searchdirn eq "-forwards"} {
+            $ctext mark set anchor @0,0
+        } else {
+            $ctext mark set anchor @0,[winfo height $ctext]
+        }
     }
     if {$searchstring ne {}} {
-	set here [$ctext search -count mlen $searchdirn -- $searchstring anchor]
-	if {$here ne {}} {
-	    $ctext see $here
-	    set mend "$here + $mlen c"
-	    $ctext tag remove sel 1.0 end
-	    $ctext tag add sel $here $mend
-	    suppress_highlighting_file_for_current_scrollpos
-	    highlightfile_for_scrollpos $here
-	}
+        set here [$ctext search -count mlen $searchdirn -- $searchstring anchor]
+        if {$here ne {}} {
+            $ctext see $here
+            set mend "$here + $mlen c"
+            $ctext tag remove sel 1.0 end
+            $ctext tag add sel $here $mend
+            suppress_highlighting_file_for_current_scrollpos
+            highlightfile_for_scrollpos $here
+        }
     }
     rehighlight_search_results
 }
@@ -8468,25 +8486,25 @@ proc dosearch {} {
     $sstring icursor end
     set searchdirn -forwards
     if {$searchstring ne {}} {
-	set sel [$ctext tag ranges sel]
-	if {$sel ne {}} {
-	    set start "[lindex $sel 0] + 1c"
-	} elseif {[catch {set start [$ctext index anchor]}]} {
-	    set start "@0,0"
-	}
-	set match [$ctext search -count mlen -- $searchstring $start]
-	$ctext tag remove sel 1.0 end
-	if {$match eq {}} {
-	    bell
-	    return
-	}
-	$ctext see $match
-	suppress_highlighting_file_for_current_scrollpos
-	highlightfile_for_scrollpos $match
-	set mend "$match + $mlen c"
-	$ctext tag add sel $match $mend
-	$ctext mark unset anchor
-	rehighlight_search_results
+        set sel [$ctext tag ranges sel]
+        if {$sel ne {}} {
+            set start "[lindex $sel 0] + 1c"
+        } elseif {[catch {set start [$ctext index anchor]}]} {
+            set start "@0,0"
+        }
+        set match [$ctext search -count mlen -- $searchstring $start]
+        $ctext tag remove sel 1.0 end
+        if {$match eq {}} {
+            bell
+            return
+        }
+        $ctext see $match
+        suppress_highlighting_file_for_current_scrollpos
+        highlightfile_for_scrollpos $match
+        set mend "$match + $mlen c"
+        $ctext tag add sel $match $mend
+        $ctext mark unset anchor
+        rehighlight_search_results
     }
 }
 
@@ -8497,25 +8515,25 @@ proc dosearchback {} {
     $sstring icursor end
     set searchdirn -backwards
     if {$searchstring ne {}} {
-	set sel [$ctext tag ranges sel]
-	if {$sel ne {}} {
-	    set start [lindex $sel 0]
-	} elseif {[catch {set start [$ctext index anchor]}]} {
-	    set start @0,[winfo height $ctext]
-	}
-	set match [$ctext search -backwards -count ml -- $searchstring $start]
-	$ctext tag remove sel 1.0 end
-	if {$match eq {}} {
-	    bell
-	    return
-	}
-	$ctext see $match
-	suppress_highlighting_file_for_current_scrollpos
-	highlightfile_for_scrollpos $match
-	set mend "$match + $ml c"
-	$ctext tag add sel $match $mend
-	$ctext mark unset anchor
-	rehighlight_search_results
+        set sel [$ctext tag ranges sel]
+        if {$sel ne {}} {
+            set start [lindex $sel 0]
+        } elseif {[catch {set start [$ctext index anchor]}]} {
+            set start @0,[winfo height $ctext]
+        }
+        set match [$ctext search -backwards -count ml -- $searchstring $start]
+        $ctext tag remove sel 1.0 end
+        if {$match eq {}} {
+            bell
+            return
+        }
+        $ctext see $match
+        suppress_highlighting_file_for_current_scrollpos
+        highlightfile_for_scrollpos $match
+        set mend "$match + $ml c"
+        $ctext tag add sel $match $mend
+        $ctext mark unset anchor
+        rehighlight_search_results
     }
 }
 
@@ -8526,7 +8544,7 @@ proc rehighlight_search_results {} {
     $ctext tag remove currentsearchhit 1.0 end
 
     if {$searchstring ne {}} {
-	searchmarkvisible 1
+        searchmarkvisible 1
     }
 }
 
@@ -8537,14 +8555,14 @@ proc searchmark {first last} {
 
     set mend $first.0
     while {1} {
-	set match [$ctext search -count mlen -- $searchstring $mend $last.end]
-	if {$match eq {}} break
-	set mend "$match + $mlen c"
-	if {$sel ne {} && [$ctext compare $match == [lindex $sel 0]]} {
-	    $ctext tag add currentsearchhit $match $mend
-	} else {
-	    $ctext tag add found $match $mend
-	}
+        set match [$ctext search -count mlen -- $searchstring $mend $last.end]
+        if {$match eq {}} break
+        set mend "$match + $mlen c"
+        if {$sel ne {} && [$ctext compare $match == [lindex $sel 0]]} {
+            $ctext tag add currentsearchhit $match $mend
+        } else {
+            $ctext tag add found $match $mend
+        }
     }
 }
 
@@ -8554,19 +8572,19 @@ proc searchmarkvisible {doall} {
     set topline [lindex [split [$ctext index @0,0] .] 0]
     set botline [lindex [split [$ctext index @0,[winfo height $ctext]] .] 0]
     if {$doall || $botline < $smarktop || $topline > $smarkbot} {
-	# no overlap with previous
-	searchmark $topline $botline
-	set smarktop $topline
-	set smarkbot $botline
+        # no overlap with previous
+        searchmark $topline $botline
+        set smarktop $topline
+        set smarkbot $botline
     } else {
-	if {$topline < $smarktop} {
-	    searchmark $topline [expr {$smarktop-1}]
-	    set smarktop $topline
-	}
-	if {$botline > $smarkbot} {
-	    searchmark [expr {$smarkbot+1}] $botline
-	    set smarkbot $botline
-	}
+        if {$topline < $smarktop} {
+            searchmark $topline [expr {$smarktop-1}]
+            set smarktop $topline
+        }
+        if {$botline > $smarkbot} {
+            searchmark [expr {$smarkbot+1}] $botline
+            set smarkbot $botline
+        }
     }
 }
 
@@ -8582,15 +8600,15 @@ proc scrolltext {f0 f1} {
 
     set topidx [$ctext index @0,0]
     if {![info exists suppress_highlighting_file_for_this_scrollpos]
-	|| $topidx ne $suppress_highlighting_file_for_this_scrollpos} {
-	highlightfile_for_scrollpos $topidx
+        || $topidx ne $suppress_highlighting_file_for_this_scrollpos} {
+        highlightfile_for_scrollpos $topidx
     }
 
     unset -nocomplain suppress_highlighting_file_for_this_scrollpos
 
     .bleft.bottom.sb set $f0 $f1
     if {$searchstring ne {}} {
-	searchmarkvisible 0
+        searchmarkvisible 0
     }
 }
 
@@ -8619,8 +8637,8 @@ proc redisplay {} {
     allcanvs yview moveto [lindex $span 0]
     drawvisible
     if {$selectedline ne {}} {
-	selectline $selectedline 0
-	allcanvs yview moveto [lindex $span 0]
+        selectline $selectedline 0
+        allcanvs yview moveto [lindex $span 0]
     }
 }
 
@@ -8630,20 +8648,20 @@ proc parsefont {f n} {
     set fontattr($f,family) [lindex $n 0]
     set s [lindex $n 1]
     if {$s eq {} || $s == 0} {
-	set s 10
+        set s 10
     } elseif {$s < 0} {
-	set s [expr {int(-$s / [winfo fpixels . 1p] + 0.5)}]
+        set s [expr {int(-$s / [winfo fpixels . 1p] + 0.5)}]
     }
     set fontattr($f,size) $s
     set fontattr($f,weight) normal
     set fontattr($f,slant) roman
     foreach style [lrange $n 2 end] {
-	switch -- $style {
-	    "normal" -
-	    "bold"   {set fontattr($f,weight) $style}
-	    "roman" -
-	    "italic" {set fontattr($f,slant) $style}
-	}
+        switch -- $style {
+            "normal" -
+            "bold"   {set fontattr($f,weight) $style}
+            "roman" -
+            "italic" {set fontattr($f,slant) $style}
+        }
     }
 }
 
@@ -8651,8 +8669,8 @@ proc fontflags {f {isbold 0}} {
     global fontattr
 
     return [list -family $fontattr($f,family) -size $fontattr($f,size) \
-		-weight [expr {$isbold? "bold": $fontattr($f,weight)}] \
-		-slant $fontattr($f,slant)]
+                -weight [expr {$isbold? "bold": $fontattr($f,weight)}] \
+                -slant $fontattr($f,slant)]
 }
 
 proc fontname {f} {
@@ -8660,10 +8678,10 @@ proc fontname {f} {
 
     set n [list $fontattr($f,family) $fontattr($f,size)]
     if {$fontattr($f,weight) eq "bold"} {
-	lappend n "bold"
+        lappend n "bold"
     }
     if {$fontattr($f,slant) eq "italic"} {
-	lappend n "italic"
+        lappend n "italic"
     }
     return $n
 }
@@ -8676,7 +8694,7 @@ proc incrfont {inc} {
     set s $fontattr(mainfont,size)
     incr s $inc
     if {$s < 1} {
-	set s 1
+        set s 1
     }
     set fontattr(mainfont,size) $s
     font config mainfont -size $s
@@ -8685,7 +8703,7 @@ proc incrfont {inc} {
     set s $fontattr(textfont,size)
     incr s $inc
     if {$s < 1} {
-	set s 1
+        set s 1
     }
     set fontattr(textfont,size) $s
     font config textfont -size $s
@@ -8699,23 +8717,23 @@ proc incrfont {inc} {
 proc clearsha1 {} {
     global sha1entry sha1string
     if {[string length $sha1string] == 40} {
-	$sha1entry delete 0 end
+        $sha1entry delete 0 end
     }
 }
 
 proc sha1change {n1 n2 op} {
     global sha1string currentid sha1but
     if {$sha1string == {}
-	|| ([info exists currentid] && $sha1string == $currentid)} {
-	set state disabled
+        || ([info exists currentid] && $sha1string == $currentid)} {
+        set state disabled
     } else {
-	set state normal
+        set state normal
     }
     if {[$sha1but cget -state] == $state} return
     if {$state == "normal"} {
-	$sha1but conf -state normal -relief raised -text "[mc "Goto:"] "
+        $sha1but conf -state normal -relief raised -text "[mc "Goto:"] "
     } else {
-	$sha1but conf -state disabled -relief flat -text "[mc "SHA1 ID:"] "
+        $sha1but conf -state disabled -relief flat -text "[mc "SHA1 ID:"] "
     }
 }
 
@@ -8723,37 +8741,37 @@ proc gotocommit {} {
     global sha1string tagids headids curview varcid
 
     if {$sha1string == {}
-	|| ([info exists currentid] && $sha1string == $currentid)} return
+        || ([info exists currentid] && $sha1string == $currentid)} return
     if {[info exists tagids($sha1string)]} {
-	set id $tagids($sha1string)
+        set id $tagids($sha1string)
     } elseif {[info exists headids($sha1string)]} {
-	set id $headids($sha1string)
+        set id $headids($sha1string)
     } else {
-	set id [string tolower $sha1string]
-	if {[regexp {^[0-9a-f]{4,39}$} $id]} {
-	    set matches [longid $id]
-	    if {$matches ne {}} {
-		if {[llength $matches] > 1} {
-		    error_popup [mc "Short SHA1 id %s is ambiguous" $id]
-		    return
-		}
-		set id [lindex $matches 0]
-	    }
-	} else {
-	    if {[catch {set id [exec git rev-parse --verify $sha1string]}]} {
-		error_popup [mc "Revision %s is not known" $sha1string]
-		return
-	    }
-	}
+        set id [string tolower $sha1string]
+        if {[regexp {^[0-9a-f]{4,39}$} $id]} {
+            set matches [longid $id]
+            if {$matches ne {}} {
+                if {[llength $matches] > 1} {
+                    error_popup [mc "Short SHA1 id %s is ambiguous" $id]
+                    return
+                }
+                set id [lindex $matches 0]
+            }
+        } else {
+            if {[catch {set id [exec git rev-parse --verify $sha1string]}]} {
+                error_popup [mc "Revision %s is not known" $sha1string]
+                return
+            }
+        }
     }
     if {[commitinview $id $curview]} {
-	selectline [rowofcommit $id] 1
-	return
+        selectline [rowofcommit $id] 1
+        return
     }
     if {[regexp {^[0-9a-fA-F]{4,}$} $sha1string]} {
-	set msg [mc "SHA1 id %s is not known" $sha1string]
+        set msg [mc "SHA1 id %s is not known" $sha1string]
     } else {
-	set msg [mc "Revision %s is not in the current view" $sha1string]
+        set msg [mc "Revision %s is not in the current view" $sha1string]
     }
     error_popup $msg
 }
@@ -8767,7 +8785,7 @@ proc lineenter {x y id} {
     set hovery $y
     set hoverid $id
     if {[info exists hovertimer]} {
-	after cancel $hovertimer
+        after cancel $hovertimer
     }
     set hovertimer [after 500 linehover]
     $canv delete hover
@@ -8777,12 +8795,12 @@ proc linemotion {x y id} {
     global hoverx hovery hoverid hovertimer
 
     if {[info exists hoverid] && $id == $hoverid} {
-	set hoverx $x
-	set hovery $y
-	if {[info exists hovertimer]} {
-	    after cancel $hovertimer
-	}
-	set hovertimer [after 500 linehover]
+        set hoverx $x
+        set hovery $y
+        if {[info exists hovertimer]} {
+            after cancel $hovertimer
+        }
+        set hovertimer [after 500 linehover]
     }
 }
 
@@ -8790,12 +8808,12 @@ proc lineleave {id} {
     global hoverid hovertimer canv
 
     if {[info exists hoverid] && $id == $hoverid} {
-	$canv delete hover
-	if {[info exists hovertimer]} {
-	    after cancel $hovertimer
-	    unset hovertimer
-	}
-	unset hoverid
+        $canv delete hover
+        if {[info exists hovertimer]} {
+            after cancel $hovertimer
+            unset hovertimer
+        }
+        unset hoverid
     }
 }
 
@@ -8817,11 +8835,11 @@ proc linehover {} {
     set x1 [expr {$x + [font measure mainfont $text] + 2 * $lthickness}]
     set y1 [expr {$y + $linespc + 2 * $lthickness}]
     set t [$canv create rectangle $x0 $y0 $x1 $y1 \
-	       -fill $linehoverbgcolor -outline $linehoveroutlinecolor \
-	       -width 1 -tags hover]
+               -fill $linehoverbgcolor -outline $linehoveroutlinecolor \
+               -width 1 -tags hover]
     $canv raise $t
     set t [$canv create text $x $y -anchor nw -text $text -tags hover \
-	       -font mainfont -fill $linehoverfgcolor]
+               -font mainfont -fill $linehoverfgcolor]
     $canv raise $t
 }
 
@@ -8832,10 +8850,10 @@ proc clickisonarrow {id y} {
     set thresh [expr {2 * $lthickness + 6}]
     set n [expr {[llength $ranges] - 1}]
     for {set i 1} {$i < $n} {incr i} {
-	set row [lindex $ranges $i]
-	if {abs([yc $row] - $y) < $thresh} {
-	    return $i
-	}
+        set row [lindex $ranges $i]
+        if {abs([yc $row] - $y) < $thresh} {
+            return $i
+        }
     }
     return {}
 }
@@ -8853,7 +8871,7 @@ proc arrowjump {id n y} {
     set yspan [expr {[lindex $view 1] - [lindex $view 0]}]
     set yfrac [expr {$yt / $ymax - $yspan / 2}]
     if {$yfrac < 0} {
-	set yfrac 0
+        set yfrac 0
     }
     allcanvs yview moveto $yfrac
 }
@@ -8870,19 +8888,19 @@ proc lineclick {x y id isnew} {
     set thickerline $id
     drawlines $id
     if {$isnew} {
-	set ymax [lindex [$canv cget -scrollregion] 3]
-	if {$ymax eq {}} return
-	set yfrac [lindex [$canv yview] 0]
-	set y [expr {$y + $yfrac * $ymax}]
+        set ymax [lindex [$canv cget -scrollregion] 3]
+        if {$ymax eq {}} return
+        set yfrac [lindex [$canv yview] 0]
+        set y [expr {$y + $yfrac * $ymax}]
     }
     set dirn [clickisonarrow $id $y]
     if {$dirn ne {}} {
-	arrowjump $id $dirn $y
-	return
+        arrowjump $id $dirn $y
+        return
     }
 
     if {$isnew} {
-	addtohistory [list lineclick $x $y $id 0] savectextpos
+        addtohistory [list lineclick $x $y $id 0] savectextpos
     }
     # fill the details pane with info about this line
     $ctext conf -state normal
@@ -8898,20 +8916,20 @@ proc lineclick {x y id isnew} {
     $ctext insert end "\t[mc "Date"]:\t$date\n"
     set kids $children($curview,$id)
     if {$kids ne {}} {
-	$ctext insert end "\n[mc "Children"]:"
-	set i 0
-	foreach child $kids {
-	    incr i
-	    if {![info exists commitinfo($child)] && ![getcommit $child]} continue
-	    set info $commitinfo($child)
-	    $ctext insert end "\n\t"
-	    $ctext insert end $child link$i
-	    setlink $child link$i
-	    $ctext insert end "\n\t[lindex $info 0]"
-	    $ctext insert end "\n\t[mc "Author"]:\t[lindex $info 1]"
-	    set date [formatdate [lindex $info 2]]
-	    $ctext insert end "\n\t[mc "Date"]:\t$date\n"
-	}
+        $ctext insert end "\n[mc "Children"]:"
+        set i 0
+        foreach child $kids {
+            incr i
+            if {![info exists commitinfo($child)] && ![getcommit $child]} continue
+            set info $commitinfo($child)
+            $ctext insert end "\n\t"
+            $ctext insert end $child link$i
+            setlink $child link$i
+            $ctext insert end "\n\t[lindex $info 0]"
+            $ctext insert end "\n\t[mc "Author"]:\t[lindex $info 1]"
+            set date [formatdate [lindex $info 2]]
+            $ctext insert end "\n\t[mc "Date"]:\t$date\n"
+        }
     }
     maybe_scroll_ctext 1
     $ctext conf -state disabled
@@ -8921,23 +8939,23 @@ proc lineclick {x y id isnew} {
 proc normalline {} {
     global thickerline
     if {[info exists thickerline]} {
-	set id $thickerline
-	unset thickerline
-	drawlines $id
+        set id $thickerline
+        unset thickerline
+        drawlines $id
     }
 }
 
 proc selbyid {id {isnew 1}} {
     global curview
     if {[commitinview $id $curview]} {
-	selectline [rowofcommit $id] $isnew
+        selectline [rowofcommit $id] $isnew
     }
 }
 
 proc mstime {} {
     global startmstime
     if {![info exists startmstime]} {
-	set startmstime [clock clicks -milliseconds]
+        set startmstime [clock clicks -milliseconds]
     }
     return [format "%.3f" [expr {([clock click -milliseconds] - $startmstime) / 1000.0}]]
 }
@@ -8949,27 +8967,27 @@ proc rowmenu {x y id} {
     stopfinding
     set rowmenuid $id
     if {$selectedline eq {} || [rowofcommit $id] eq $selectedline} {
-	set state disabled
+        set state disabled
     } else {
-	set state normal
+        set state normal
     }
     if {[info exists markedid] && $markedid ne $id} {
-	set mstate normal
+        set mstate normal
     } else {
-	set mstate disabled
+        set mstate disabled
     }
     if {$id ne $nullid && $id ne $nullid2} {
-	set menu $rowctxmenu
-	if {$mainhead ne {}} {
-	    $menu entryconfigure 8 -label [mc "Reset %s branch to here" $mainhead] -state normal
-	} else {
-	    $menu entryconfigure 8 -label [mc "Detached head: can't reset" $mainhead] -state disabled
-	}
-	$menu entryconfigure 10 -state $mstate
-	$menu entryconfigure 11 -state $mstate
-	$menu entryconfigure 12 -state $mstate
+        set menu $rowctxmenu
+        if {$mainhead ne {}} {
+            $menu entryconfigure 8 -label [mc "Reset %s branch to here" $mainhead] -state normal
+        } else {
+            $menu entryconfigure 8 -label [mc "Detached head: can't reset" $mainhead] -state disabled
+        }
+        $menu entryconfigure 10 -state $mstate
+        $menu entryconfigure 11 -state $mstate
+        $menu entryconfigure 12 -state $mstate
     } else {
-	set menu $fakerowmenu
+        set menu $fakerowmenu
     }
     $menu entryconfigure [mca "Diff this -> selected"] -state $state
     $menu entryconfigure [mca "Diff selected -> this"] -state $state
@@ -8990,7 +9008,7 @@ proc gotomark {} {
     global markedid
 
     if {[info exists markedid]} {
-	selbyid $markedid
+        selbyid $markedid
     }
 }
 
@@ -9000,7 +9018,7 @@ proc replace_by_kids {l r} {
     set id [commitonrow $r]
     set l [lreplace $l 0 0]
     foreach kid $children($curview,$id) {
-	lappend l [rowofcommit $kid]
+        lappend l [rowofcommit $kid]
     }
     return [lsort -integer -decreasing -unique $l]
 }
@@ -9010,23 +9028,23 @@ proc find_common_desc {} {
 
     if {![info exists markedid]} return
     if {![commitinview $markedid $curview] ||
-	![commitinview $rowmenuid $curview]} return
+        ![commitinview $rowmenuid $curview]} return
     #set t1 [clock clicks -milliseconds]
     set l1 [list [rowofcommit $markedid]]
     set l2 [list [rowofcommit $rowmenuid]]
     while 1 {
-	set r1 [lindex $l1 0]
-	set r2 [lindex $l2 0]
-	if {$r1 eq {} || $r2 eq {}} break
-	if {$r1 == $r2} {
-	    selectline $r1 1
-	    break
-	}
-	if {$r1 > $r2} {
-	    set l1 [replace_by_kids $l1 $r1]
-	} else {
-	    set l2 [replace_by_kids $l2 $r2]
-	}
+        set r1 [lindex $l1 0]
+        set r2 [lindex $l2 0]
+        if {$r1 eq {} || $r2 eq {}} break
+        if {$r1 == $r2} {
+            selectline $r1 1
+            break
+        }
+        if {$r1 > $r2} {
+            set l1 [replace_by_kids $l1 $r1]
+        } else {
+            set l2 [replace_by_kids $l2 $r2]
+        }
     }
     #set t2 [clock clicks -milliseconds]
     #puts "took [expr {$t2-$t1}]ms"
@@ -9045,15 +9063,15 @@ proc getpatchid {id} {
     global patchids
 
     if {![info exists patchids($id)]} {
-	set cmd [diffcmd [list $id] {-p --root}]
-	# trim off the initial "|"
-	set cmd [lrange $cmd 1 end]
-	if {[catch {
-	    set x [eval exec $cmd | git patch-id]
-	    set patchids($id) [lindex $x 0]
-	}]} {
-	    set patchids($id) "error"
-	}
+        set cmd [diffcmd [list $id] {-p --root}]
+        # trim off the initial "|"
+        set cmd [lrange $cmd 1 end]
+        if {[catch {
+            set x [eval exec $cmd | git patch-id]
+            set patchids($id) [lindex $x 0]
+        }]} {
+            set patchids($id) "error"
+        }
     }
     return $patchids($id)
 }
@@ -9065,75 +9083,75 @@ proc do_cmp_commits {a b} {
     clear_ctext
     init_flist {}
     for {set i 0} {$i < 100} {incr i} {
-	set skipa 0
-	set skipb 0
-	if {[llength $parents($curview,$a)] > 1} {
-	    appendshortlink $a [mc "Skipping merge commit "] "\n"
-	    set skipa 1
-	} else {
-	    set patcha [getpatchid $a]
-	}
-	if {[llength $parents($curview,$b)] > 1} {
-	    appendshortlink $b [mc "Skipping merge commit "] "\n"
-	    set skipb 1
-	} else {
-	    set patchb [getpatchid $b]
-	}
-	if {!$skipa && !$skipb} {
-	    set heada [lindex $commitinfo($a) 0]
-	    set headb [lindex $commitinfo($b) 0]
-	    if {$patcha eq "error"} {
-		appendshortlink $a [mc "Error getting patch ID for "] \
-		    [mc " - stopping\n"]
-		break
-	    }
-	    if {$patchb eq "error"} {
-		appendshortlink $b [mc "Error getting patch ID for "] \
-		    [mc " - stopping\n"]
-		break
-	    }
-	    if {$patcha eq $patchb} {
-		if {$heada eq $headb} {
-		    appendshortlink $a [mc "Commit "]
-		    appendshortlink $b " == " "  $heada\n"
-		} else {
-		    appendshortlink $a [mc "Commit "] "  $heada\n"
-		    appendshortlink $b [mc " is the same patch as\n       "] \
-			"  $headb\n"
-		}
-		set skipa 1
-		set skipb 1
-	    } else {
-		$ctext insert end "\n"
-		appendshortlink $a [mc "Commit "] "  $heada\n"
-		appendshortlink $b [mc " differs from\n       "] \
-		    "  $headb\n"
-		$ctext insert end [mc "Diff of commits:\n\n"]
-		$ctext conf -state disabled
-		update
-		diffcommits $a $b
-		return
-	    }
-	}
-	if {$skipa} {
-	    set kids [real_children $curview,$a]
-	    if {[llength $kids] != 1} {
-		$ctext insert end "\n"
-		appendshortlink $a [mc "Commit "] \
-		    [mc " has %s children - stopping\n" [llength $kids]]
-		break
-	    }
-	    set a [lindex $kids 0]
-	}
-	if {$skipb} {
-	    set kids [real_children $curview,$b]
-	    if {[llength $kids] != 1} {
-		appendshortlink $b [mc "Commit "] \
-		    [mc " has %s children - stopping\n" [llength $kids]]
-		break
-	    }
-	    set b [lindex $kids 0]
-	}
+        set skipa 0
+        set skipb 0
+        if {[llength $parents($curview,$a)] > 1} {
+            appendshortlink $a [mc "Skipping merge commit "] "\n"
+            set skipa 1
+        } else {
+            set patcha [getpatchid $a]
+        }
+        if {[llength $parents($curview,$b)] > 1} {
+            appendshortlink $b [mc "Skipping merge commit "] "\n"
+            set skipb 1
+        } else {
+            set patchb [getpatchid $b]
+        }
+        if {!$skipa && !$skipb} {
+            set heada [lindex $commitinfo($a) 0]
+            set headb [lindex $commitinfo($b) 0]
+            if {$patcha eq "error"} {
+                appendshortlink $a [mc "Error getting patch ID for "] \
+                    [mc " - stopping\n"]
+                break
+            }
+            if {$patchb eq "error"} {
+                appendshortlink $b [mc "Error getting patch ID for "] \
+                    [mc " - stopping\n"]
+                break
+            }
+            if {$patcha eq $patchb} {
+                if {$heada eq $headb} {
+                    appendshortlink $a [mc "Commit "]
+                    appendshortlink $b " == " "  $heada\n"
+                } else {
+                    appendshortlink $a [mc "Commit "] "  $heada\n"
+                    appendshortlink $b [mc " is the same patch as\n       "] \
+                        "  $headb\n"
+                }
+                set skipa 1
+                set skipb 1
+            } else {
+                $ctext insert end "\n"
+                appendshortlink $a [mc "Commit "] "  $heada\n"
+                appendshortlink $b [mc " differs from\n       "] \
+                    "  $headb\n"
+                $ctext insert end [mc "Diff of commits:\n\n"]
+                $ctext conf -state disabled
+                update
+                diffcommits $a $b
+                return
+            }
+        }
+        if {$skipa} {
+            set kids [real_children $curview,$a]
+            if {[llength $kids] != 1} {
+                $ctext insert end "\n"
+                appendshortlink $a [mc "Commit "] \
+                    [mc " has %s children - stopping\n" [llength $kids]]
+                break
+            }
+            set a [lindex $kids 0]
+        }
+        if {$skipb} {
+            set kids [real_children $curview,$b]
+            if {[llength $kids] != 1} {
+                appendshortlink $b [mc "Commit "] \
+                    [mc " has %s children - stopping\n" [llength $kids]]
+                break
+            }
+            set b [lindex $kids 0]
+        }
     }
     $ctext conf -state disabled
 }
@@ -9145,17 +9163,17 @@ proc diffcommits {a b} {
     set fna [file join $tmpdir "commit-[string range $a 0 7]"]
     set fnb [file join $tmpdir "commit-[string range $b 0 7]"]
     if {[catch {
-	exec git diff-tree -p --pretty $a >$fna
-	exec git diff-tree -p --pretty $b >$fnb
+        exec git diff-tree -p --pretty $a >$fna
+        exec git diff-tree -p --pretty $b >$fnb
     } err]} {
-	error_popup [mc "Error writing commit to file: %s" $err]
-	return
+        error_popup [mc "Error writing commit to file: %s" $err]
+        return
     }
     if {[catch {
-	set fd [open "| diff -U$diffcontext $fna $fnb" r]
+        set fd [open "| diff -U$diffcontext $fna $fnb" r]
     } err]} {
-	error_popup [mc "Error diffing commits: %s" $err]
-	return
+        error_popup [mc "Error diffing commits: %s" $err]
+        return
     }
     set diffids [list commits $a $b]
     set blobdifffd($diffids) $fd
@@ -9169,11 +9187,11 @@ proc diffvssel {dirn} {
 
     if {$selectedline eq {}} return
     if {$dirn} {
-	set oldid [commitonrow $selectedline]
-	set newid $rowmenuid
+        set oldid [commitonrow $selectedline]
+        set newid $rowmenuid
     } else {
-	set oldid $rowmenuid
-	set newid [commitonrow $selectedline]
+        set oldid $rowmenuid
+        set newid [commitonrow $selectedline]
     }
     addtohistory [list doseldiff $oldid $newid] savectextpos
     doseldiff $oldid $newid
@@ -9184,11 +9202,11 @@ proc diffvsmark {dirn} {
 
     if {![info exists markedid]} return
     if {$dirn} {
-	set oldid $markedid
-	set newid $rowmenuid
+        set oldid $markedid
+        set newid $rowmenuid
     } else {
-	set oldid $rowmenuid
-	set newid $markedid
+        set oldid $rowmenuid
+        set newid $markedid
     }
     addtohistory [list doseldiff $oldid $newid] savectextpos
     doseldiff $oldid $newid
@@ -9277,11 +9295,11 @@ proc mkpatchrev {} {
     set newid [$patchtop.tosha1 get]
     set newhead [$patchtop.tohead get]
     foreach e [list fromsha1 fromhead tosha1 tohead] \
-	    v [list $newid $newhead $oldid $oldhead] {
-	$patchtop.$e conf -state normal
-	$patchtop.$e delete 0 end
-	$patchtop.$e insert 0 $v
-	$patchtop.$e conf -state readonly
+            v [list $newid $newhead $oldid $oldhead] {
+        $patchtop.$e conf -state normal
+        $patchtop.$e delete 0 end
+        $patchtop.$e insert 0 $v
+        $patchtop.$e conf -state readonly
     }
 }
 
@@ -9296,7 +9314,7 @@ proc mkpatchgo {} {
     set cmd [lrange $cmd 1 end]
     lappend cmd >$fname &
     if {[catch {eval exec $cmd} err]} {
-	error_popup "[mc "Error creating patch:"] $err" $patchtop
+        error_popup "[mc "Error creating patch:"] $err" $patchtop
     }
     catch {destroy $patchtop}
     unset patchtop
@@ -9355,22 +9373,22 @@ proc domktag {} {
     set tag [$mktagtop.tag get]
     set msg [$mktagtop.msg get]
     if {$tag == {}} {
-	error_popup [mc "No tag name specified"] $mktagtop
-	return 0
+        error_popup [mc "No tag name specified"] $mktagtop
+        return 0
     }
     if {[info exists tagids($tag)]} {
-	error_popup [mc "Tag \"%s\" already exists" $tag] $mktagtop
-	return 0
+        error_popup [mc "Tag \"%s\" already exists" $tag] $mktagtop
+        return 0
     }
     if {[catch {
-	if {$msg != {}} {
-	    exec git tag -a -m $msg $tag $id
-	} else {
-	    exec git tag $tag $id
-	}
+        if {$msg != {}} {
+            exec git tag -a -m $msg $tag $id
+        } else {
+            exec git tag $tag $id
+        }
     } err]} {
-	error_popup "[mc "Error creating tag:"] $err" $mktagtop
-	return 0
+        error_popup "[mc "Error creating tag:"] $err" $mktagtop
+        return 0
     }
 
     set tagids($tag) $id
@@ -9391,9 +9409,9 @@ proc redrawtags {id} {
     if {![info exists iddrawn($id)]} return
     set row [rowofcommit $id]
     if {$id eq $mainheadid} {
-	set ofill $mainheadcirclecolor
+        set ofill $mainheadcirclecolor
     } else {
-	set ofill [lindex $circlecolors $cmitlisted($curview,$id)]
+        set ofill [lindex $circlecolors $cmitlisted($curview,$id)]
     }
     $canv itemconf $circleitem($row) -fill $ofill
     $canv delete tag.$id
@@ -9403,14 +9421,14 @@ proc redrawtags {id} {
     set font [$canv itemcget $linehtag($id) -font]
     set xr [expr {$xt + [font measure $font $text]}]
     if {$xr > $canvxmax} {
-	set canvxmax $xr
-	setcanvscroll
+        set canvxmax $xr
+        setcanvscroll
     }
     if {[info exists currentid] && $currentid == $id} {
-	make_secsel $id
+        make_secsel $id
     }
     if {[info exists markedid] && $markedid eq $id} {
-	make_idmark $id
+        make_idmark $id
     }
 }
 
@@ -9426,7 +9444,7 @@ proc mktaggo {} {
     mktagcan
 }
 
-proc copysummary {} {
+proc copyreference {} {
     global rowmenuid autosellen
 
     set format "%h (\"%s\", %ad)"
@@ -9434,10 +9452,10 @@ proc copysummary {} {
     if {$autosellen < 40} {
         lappend cmd --abbrev=$autosellen
     }
-    set summary [eval exec $cmd $rowmenuid]
+    set reference [eval exec $cmd $rowmenuid]
 
     clipboard clear
-    clipboard append $summary
+    clipboard append $reference
 }
 
 proc writecommit {} {
@@ -9485,7 +9503,7 @@ proc wrcomgo {} {
     set cmd "echo $id | [$wrcomtop.cmd get]"
     set fname [$wrcomtop.fname get]
     if {[catch {exec sh -c $cmd >$fname &} err]} {
-	error_popup "[mc "Error writing commit:"] $err" $wrcomtop
+        error_popup "[mc "Error writing commit:"] $err" $wrcomtop
     }
     catch {destroy $wrcomtop}
     unset wrcomtop
@@ -9572,41 +9590,41 @@ proc mkbrgo {top} {
     set cmdargs {}
     set old_id {}
     if {$name eq {}} {
-	error_popup [mc "Please specify a name for the new branch"] $top
-	return
+        error_popup [mc "Please specify a name for the new branch"] $top
+        return
     }
     if {[info exists headids($name)]} {
-	if {![confirm_popup [mc \
-		"Branch '%s' already exists. Overwrite?" $name] $top]} {
-	    return
-	}
-	set old_id $headids($name)
-	lappend cmdargs -f
+        if {![confirm_popup [mc \
+                "Branch '%s' already exists. Overwrite?" $name] $top]} {
+            return
+        }
+        set old_id $headids($name)
+        lappend cmdargs -f
     }
     catch {destroy $top}
     lappend cmdargs $name $id
     nowbusy newbranch
     update
     if {[catch {
-	eval exec git branch $cmdargs
+        eval exec git branch $cmdargs
     } err]} {
-	notbusy newbranch
-	error_popup $err
+        notbusy newbranch
+        error_popup $err
     } else {
-	notbusy newbranch
-	if {$old_id ne {}} {
-	    movehead $id $name
-	    movedhead $id $name
-	    redrawtags $old_id
-	    redrawtags $id
-	} else {
-	    set headids($name) $id
-	    lappend idheads($id) $name
-	    addedhead $id $name
-	    redrawtags $id
-	}
-	dispneartags 0
-	run refill_reflist
+        notbusy newbranch
+        if {$old_id ne {}} {
+            movehead $id $name
+            movedhead $id $name
+            redrawtags $old_id
+            redrawtags $id
+        } else {
+            set headids($name) $id
+            lappend idheads($id) $name
+            addedhead $id $name
+            redrawtags $id
+        }
+        dispneartags 0
+        run refill_reflist
     }
 }
 
@@ -9617,36 +9635,36 @@ proc mvbrgo {top prevname} {
     set id [$top.sha1 get]
     set cmdargs {}
     if {$name eq $prevname} {
-	catch {destroy $top}
-	return
+        catch {destroy $top}
+        return
     }
     if {$name eq {}} {
-	error_popup [mc "Please specify a new name for the branch"] $top
-	return
+        error_popup [mc "Please specify a new name for the branch"] $top
+        return
     }
     catch {destroy $top}
     lappend cmdargs -m $prevname $name
     nowbusy renamebranch
     update
     if {[catch {
-	eval exec git branch $cmdargs
+        eval exec git branch $cmdargs
     } err]} {
-	notbusy renamebranch
-	error_popup $err
+        notbusy renamebranch
+        error_popup $err
     } else {
-	notbusy renamebranch
-	removehead $id $prevname
-	removedhead $id $prevname
-	set headids($name) $id
-	lappend idheads($id) $name
-	addedhead $id $name
-	if {$prevname eq $mainhead} {
-	    set mainhead $name
-	    set mainheadid $id
-	}
-	redrawtags $id
-	dispneartags 0
-	run refill_reflist
+        notbusy renamebranch
+        removehead $id $prevname
+        removedhead $id $prevname
+        set headids($name) $id
+        lappend idheads($id) $name
+        addedhead $id $name
+        if {$prevname eq $mainhead} {
+            set mainhead $name
+            set mainheadid $id
+        }
+        redrawtags $id
+        dispneartags 0
+        run refill_reflist
     }
 }
 
@@ -9656,18 +9674,18 @@ proc exec_citool {tool_args {baseid {}}} {
     set save_env [array get env GIT_AUTHOR_*]
 
     if {$baseid ne {}} {
-	if {![info exists commitinfo($baseid)]} {
-	    getcommit $baseid
-	}
-	set author [lindex $commitinfo($baseid) 1]
-	set date [lindex $commitinfo($baseid) 2]
-	if {[regexp {^\s*(\S.*\S|\S)\s*<(.*)>\s*$} \
-	            $author author name email]
-	    && $date ne {}} {
-	    set env(GIT_AUTHOR_NAME) $name
-	    set env(GIT_AUTHOR_EMAIL) $email
-	    set env(GIT_AUTHOR_DATE) $date
-	}
+        if {![info exists commitinfo($baseid)]} {
+            getcommit $baseid
+        }
+        set author [lindex $commitinfo($baseid) 1]
+        set date [lindex $commitinfo($baseid) 2]
+        if {[regexp {^\s*(\S.*\S|\S)\s*<(.*)>\s*$} \
+                    $author author name email]
+            && $date ne {}} {
+            set env(GIT_AUTHOR_NAME) $name
+            set env(GIT_AUTHOR_EMAIL) $email
+            set env(GIT_AUTHOR_DATE) $date
+        }
     }
 
     eval exec git citool $tool_args &
@@ -9684,57 +9702,57 @@ proc cherrypick {} {
     set oldhead [exec git rev-parse HEAD]
     set dheads [descheads $rowmenuid]
     if {$dheads ne {} && [lsearch -exact $dheads $oldhead] >= 0} {
-	set ok [confirm_popup [mc "Commit %s is already\
-		included in branch %s -- really re-apply it?" \
-				   [string range $rowmenuid 0 7] $mainhead]]
-	if {!$ok} return
+        set ok [confirm_popup [mc "Commit %s is already\
+                included in branch %s -- really re-apply it?" \
+                                   [string range $rowmenuid 0 7] $mainhead]]
+        if {!$ok} return
     }
     nowbusy cherrypick [mc "Cherry-picking"]
     update
     # Unfortunately git-cherry-pick writes stuff to stderr even when
     # no error occurs, and exec takes that as an indication of error...
     if {[catch {exec sh -c "git cherry-pick -r $rowmenuid 2>&1"} err]} {
-	notbusy cherrypick
-	if {[regexp -line \
-		 {Entry '(.*)' (would be overwritten by merge|not uptodate)} \
-		 $err msg fname]} {
-	    error_popup [mc "Cherry-pick failed because of local changes\
-			to file '%s'.\nPlease commit, reset or stash\
-			your changes and try again." $fname]
-	} elseif {[regexp -line \
-		       {^(CONFLICT \(.*\):|Automatic cherry-pick failed|error: could not apply)} \
-		       $err]} {
-	    if {[confirm_popup [mc "Cherry-pick failed because of merge\
-			conflict.\nDo you wish to run git citool to\
-			resolve it?"]]} {
-		# Force citool to read MERGE_MSG
-		file delete [file join $gitdir "GITGUI_MSG"]
-		exec_citool {} $rowmenuid
-	    }
-	} else {
-	    error_popup $err
-	}
-	run updatecommits
-	return
+        notbusy cherrypick
+        if {[regexp -line \
+                 {Entry '(.*)' (would be overwritten by merge|not uptodate)} \
+                 $err msg fname]} {
+            error_popup [mc "Cherry-pick failed because of local changes\
+                        to file '%s'.\nPlease commit, reset or stash\
+                        your changes and try again." $fname]
+        } elseif {[regexp -line \
+                       {^(CONFLICT \(.*\):|Automatic cherry-pick failed|error: could not apply)} \
+                       $err]} {
+            if {[confirm_popup [mc "Cherry-pick failed because of merge\
+                        conflict.\nDo you wish to run git citool to\
+                        resolve it?"]]} {
+                # Force citool to read MERGE_MSG
+                file delete [file join $gitdir "GITGUI_MSG"]
+                exec_citool {} $rowmenuid
+            }
+        } else {
+            error_popup $err
+        }
+        run updatecommits
+        return
     }
     set newhead [exec git rev-parse HEAD]
     if {$newhead eq $oldhead} {
-	notbusy cherrypick
-	error_popup [mc "No changes committed"]
-	return
+        notbusy cherrypick
+        error_popup [mc "No changes committed"]
+        return
     }
     addnewchild $newhead $oldhead
     if {[commitinview $oldhead $curview]} {
-	# XXX this isn't right if we have a path limit...
-	insertrow $newhead $oldhead $curview
-	if {$mainhead ne {}} {
-	    movehead $newhead $mainhead
-	    movedhead $newhead $mainhead
-	}
-	set mainheadid $newhead
-	redrawtags $oldhead
-	redrawtags $newhead
-	selbyid $newhead
+        # XXX this isn't right if we have a path limit...
+        insertrow $newhead $oldhead $curview
+        if {$mainhead ne {}} {
+            movehead $newhead $mainhead
+            movedhead $newhead $mainhead
+        }
+        set mainheadid $newhead
+        redrawtags $oldhead
+        redrawtags $newhead
+        selbyid $newhead
     }
     notbusy cherrypick
 }
@@ -9809,18 +9827,18 @@ proc resethead {} {
     make_transient $w .
     wm title $w [mc "Confirm reset"]
     ${NS}::label $w.m -text \
-	[mc "Reset branch %s to %s?" $mainhead [string range $rowmenuid 0 7]]
+        [mc "Reset branch %s to %s?" $mainhead [string range $rowmenuid 0 7]]
     pack $w.m -side top -fill x -padx 20 -pady 20
     ${NS}::labelframe $w.f -text [mc "Reset type:"]
     set resettype mixed
     ${NS}::radiobutton $w.f.soft -value soft -variable resettype \
-	-text [mc "Soft: Leave working tree and index untouched"]
+        -text [mc "Soft: Leave working tree and index untouched"]
     grid $w.f.soft -sticky w
     ${NS}::radiobutton $w.f.mixed -value mixed -variable resettype \
-	-text [mc "Mixed: Leave working tree untouched, reset index"]
+        -text [mc "Mixed: Leave working tree untouched, reset index"]
     grid $w.f.mixed -sticky w
     ${NS}::radiobutton $w.f.hard -value hard -variable resettype \
-	-text [mc "Hard: Reset working tree and index\n(discard ALL local changes)"]
+        -text [mc "Hard: Reset working tree and index\n(discard ALL local changes)"]
     grid $w.f.hard -sticky w
     pack $w.f -side top -fill x -padx 4
     ${NS}::button $w.ok -text [mc OK] -command "set confirm_ok 1; destroy $w"
@@ -9832,13 +9850,13 @@ proc resethead {} {
     tkwait window $w
     if {!$confirm_ok} return
     if {[catch {set fd [open \
-	    [list | git reset --$resettype $rowmenuid 2>@1] r]} err]} {
-	error_popup $err
+            [list | git reset --$resettype $rowmenuid 2>@1] r]} err]} {
+        error_popup $err
     } else {
-	dohidelocalchanges
-	filerun $fd [list readresetstat $fd]
-	nowbusy reset [mc "Resetting"]
-	selbyid $rowmenuid
+        dohidelocalchanges
+        filerun $fd [list readresetstat $fd]
+        nowbusy reset [mc "Resetting"]
+        selbyid $rowmenuid
     }
 }
 
@@ -9846,29 +9864,29 @@ proc readresetstat {fd} {
     global mainhead mainheadid showlocalchanges rprogcoord
 
     if {[gets $fd line] >= 0} {
-	if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
-	    set rprogcoord [expr {1.0 * $m / $n}]
-	    adjustprogress
-	}
-	return 1
+        if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
+            set rprogcoord [expr {1.0 * $m / $n}]
+            adjustprogress
+        }
+        return 1
     }
     set rprogcoord 0
     adjustprogress
     notbusy reset
     if {[catch {close $fd} err]} {
-	error_popup $err
+        error_popup $err
     }
     set oldhead $mainheadid
     set newhead [exec git rev-parse HEAD]
     if {$newhead ne $oldhead} {
-	movehead $newhead $mainhead
-	movedhead $newhead $mainhead
-	set mainheadid $newhead
-	redrawtags $oldhead
-	redrawtags $newhead
+        movehead $newhead $mainhead
+        movedhead $newhead $mainhead
+        set mainheadid $newhead
+        redrawtags $oldhead
+        redrawtags $newhead
     }
     if {$showlocalchanges} {
-	doshowlocalchanges
+        doshowlocalchanges
     }
     return 0
 }
@@ -9882,17 +9900,17 @@ proc headmenu {x y id head} {
     set headmenuhead $head
     array set state {0 normal 1 normal 2 normal}
     if {[string match "remotes/*" $head]} {
-	set localhead [string range $head [expr [string last / $head] + 1] end]
-	if {[info exists headids($localhead)]} {
-	    set state(0) disabled
-	}
-	array set state {1 disabled 2 disabled}
+        set localhead [string range $head [expr [string last / $head] + 1] end]
+        if {[info exists headids($localhead)]} {
+            set state(0) disabled
+        }
+        array set state {1 disabled 2 disabled}
     }
     if {$head eq $mainhead} {
-	array set state {0 disabled 2 disabled}
+        array set state {0 disabled 2 disabled}
     }
     foreach i {0 1 2} {
-	$headctxmenu entryconfigure $i -state $state($i)
+        $headctxmenu entryconfigure $i -state $state($i)
     }
     tk_popup $headctxmenu $x $y
 }
@@ -9905,32 +9923,32 @@ proc cobranch {} {
     set newhead $headmenuhead
     set command [list | git checkout]
     if {[string match "remotes/*" $newhead]} {
-	set remote $newhead
-	set newhead [string range $newhead [expr [string last / $newhead] + 1] end]
-	# The following check is redundant - the menu option should
-	# be disabled to begin with...
-	if {[info exists headids($newhead)]} {
-	    error_popup [mc "A local branch named %s exists already" $newhead]
-	    return
-	}
-	lappend command -b $newhead --track $remote
+        set remote $newhead
+        set newhead [string range $newhead [expr [string last / $newhead] + 1] end]
+        # The following check is redundant - the menu option should
+        # be disabled to begin with...
+        if {[info exists headids($newhead)]} {
+            error_popup [mc "A local branch named %s exists already" $newhead]
+            return
+        }
+        lappend command -b $newhead --track $remote
     } else {
-	lappend command $newhead
+        lappend command $newhead
     }
     lappend command 2>@1
     nowbusy checkout [mc "Checking out"]
     update
     dohidelocalchanges
     if {[catch {
-	set fd [open $command r]
+        set fd [open $command r]
     } err]} {
-	notbusy checkout
-	error_popup $err
-	if {$showlocalchanges} {
-	    dodiffindex
-	}
+        notbusy checkout
+        error_popup $err
+        if {$showlocalchanges} {
+            dodiffindex
+        }
     } else {
-	filerun $fd [list readcheckoutstat $fd $newhead $headmenuid]
+        filerun $fd [list readcheckoutstat $fd $newhead $headmenuid]
     }
 }
 
@@ -9939,24 +9957,24 @@ proc readcheckoutstat {fd newhead newheadid} {
     global viewmainheadid curview
 
     if {[gets $fd line] >= 0} {
-	if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
-	    set progresscoords [list 0 [expr {1.0 * $m / $n}]]
-	    adjustprogress
-	}
-	return 1
+        if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
+            set progresscoords [list 0 [expr {1.0 * $m / $n}]]
+            adjustprogress
+        }
+        return 1
     }
     set progresscoords {0 0}
     adjustprogress
     notbusy checkout
     if {[catch {close $fd} err]} {
-	error_popup $err
-	return
+        error_popup $err
+        return
     }
     set oldmainid $mainheadid
     if {! [info exists headids($newhead)]} {
-	set headids($newhead) $newheadid
-	lappend idheads($newheadid) $newhead
-	addedhead $newheadid $newhead
+        set headids($newhead) $newheadid
+        lappend idheads($newheadid) $newhead
+        addedhead $newheadid $newhead
     }
     set mainhead $newhead
     set mainheadid $newheadid
@@ -9965,7 +9983,7 @@ proc readcheckoutstat {fd newhead newheadid} {
     redrawtags $newheadid
     selbyid $newheadid
     if {$showlocalchanges} {
-	dodiffindex
+        dodiffindex
     }
 }
 
@@ -9977,21 +9995,21 @@ proc rmbranch {} {
     set id $headmenuid
     # this check shouldn't be needed any more...
     if {$head eq $mainhead} {
-	error_popup [mc "Cannot delete the currently checked-out branch"]
-	return
+        error_popup [mc "Cannot delete the currently checked-out branch"]
+        return
     }
     set dheads [descheads $id]
     if {[llength $dheads] == 1 && $idheads($dheads) eq $head} {
-	# the stuff on this branch isn't on any other branch
-	if {![confirm_popup [mc "The commits on branch %s aren't on any other\
-			branch.\nReally delete branch %s?" $head $head]]} return
+        # the stuff on this branch isn't on any other branch
+        if {![confirm_popup [mc "The commits on branch %s aren't on any other\
+                        branch.\nReally delete branch %s?" $head $head]]} return
     }
     nowbusy rmbranch
     update
     if {[catch {exec git branch -D $head} err]} {
-	notbusy rmbranch
-	error_popup $err
-	return
+        notbusy rmbranch
+        error_popup $err
+        return
     }
     removehead $id $head
     removedhead $id $head
@@ -10009,22 +10027,22 @@ proc showrefs {} {
     set top .showrefs
     set showrefstop $top
     if {[winfo exists $top]} {
-	raise $top
-	refill_reflist
-	return
+        raise $top
+        refill_reflist
+        return
     }
     ttk_toplevel $top
     wm title $top [mc "Tags and heads: %s" [file tail [pwd]]]
     make_transient $top .
     text $top.list -background $bgcolor -foreground $fgcolor \
-	-selectbackground $selectbgcolor -font mainfont \
-	-xscrollcommand "$top.xsb set" -yscrollcommand "$top.ysb set" \
-	-width 30 -height 20 -cursor $maincursor \
-	-spacing1 1 -spacing3 1 -state disabled
+        -selectbackground $selectbgcolor -font mainfont \
+        -xscrollcommand "$top.xsb set" -yscrollcommand "$top.ysb set" \
+        -width 30 -height 20 -cursor $maincursor \
+        -spacing1 1 -spacing3 1 -state disabled
     $top.list tag configure highlight -background $selectbgcolor
     if {![lsearch -exact $bglist $top.list]} {
-	lappend bglist $top.list
-	lappend fglist $top.list
+        lappend bglist $top.list
+        lappend fglist $top.list
     }
     ${NS}::scrollbar $top.ysb -command "$top.list yview" -orient vertical
     ${NS}::scrollbar $top.xsb -command "$top.list xview" -orient horizontal
@@ -10058,10 +10076,10 @@ proc sel_reflist {w x y} {
     set ref [lindex $reflist [expr {$l-1}]]
     set n [lindex $ref 0]
     switch -- [lindex $ref 1] {
-	"H" {selbyid $headids($n)}
-	"R" {selbyid $headids($n)}
-	"T" {selbyid $tagids($n)}
-	"o" {selbyid $otherrefids($n)}
+        "H" {selbyid $headids($n)}
+        "R" {selbyid $headids($n)}
+        "T" {selbyid $tagids($n)}
+        "o" {selbyid $otherrefids($n)}
     }
     $showrefstop.list tag add highlight $l.0 "$l.0 lineend"
 }
@@ -10087,35 +10105,35 @@ proc refill_reflist {} {
     if {![info exists showrefstop] || ![winfo exists $showrefstop]} return
     set refs {}
     foreach n [array names headids] {
-	if {[string match $reflistfilter $n]} {
-	    if {[commitinview $headids($n) $curview]} {
-		if {[string match "remotes/*" $n]} {
-		    lappend refs [list $n R]
-		} else {
-		    lappend refs [list $n H]
-		}
-	    } else {
-		interestedin $headids($n) {run refill_reflist}
-	    }
-	}
+        if {[string match $reflistfilter $n]} {
+            if {[commitinview $headids($n) $curview]} {
+                if {[string match "remotes/*" $n]} {
+                    lappend refs [list $n R]
+                } else {
+                    lappend refs [list $n H]
+                }
+            } else {
+                interestedin $headids($n) {run refill_reflist}
+            }
+        }
     }
     foreach n [array names tagids] {
-	if {[string match $reflistfilter $n]} {
-	    if {[commitinview $tagids($n) $curview]} {
-		lappend refs [list $n T]
-	    } else {
-		interestedin $tagids($n) {run refill_reflist}
-	    }
-	}
+        if {[string match $reflistfilter $n]} {
+            if {[commitinview $tagids($n) $curview]} {
+                lappend refs [list $n T]
+            } else {
+                interestedin $tagids($n) {run refill_reflist}
+            }
+        }
     }
     foreach n [array names otherrefids] {
-	if {[string match $reflistfilter $n]} {
-	    if {[commitinview $otherrefids($n) $curview]} {
-		lappend refs [list $n o]
-	    } else {
-		interestedin $otherrefids($n) {run refill_reflist}
-	    }
-	}
+        if {[string match $reflistfilter $n]} {
+            if {[commitinview $otherrefids($n) $curview]} {
+                lappend refs [list $n o]
+            } else {
+                interestedin $otherrefids($n) {run refill_reflist}
+            }
+        }
     }
     set refs [lsort -index 0 $refs]
     if {$refs eq $reflist} return
@@ -10127,37 +10145,37 @@ proc refill_reflist {} {
     set i 0
     set j 0
     while {$i < [llength $reflist] || $j < [llength $refs]} {
-	if {$i < [llength $reflist]} {
-	    if {$j < [llength $refs]} {
-		set cmp [string compare [lindex $reflist $i 0] \
-			     [lindex $refs $j 0]]
-		if {$cmp == 0} {
-		    set cmp [string compare [lindex $reflist $i 1] \
-				 [lindex $refs $j 1]]
-		}
-	    } else {
-		set cmp -1
-	    }
-	} else {
-	    set cmp 1
-	}
-	switch -- $cmp {
-	    -1 {
-		$showrefstop.list delete "[expr {$j+1}].0" "[expr {$j+2}].0"
-		incr i
-	    }
-	    0 {
-		incr i
-		incr j
-	    }
-	    1 {
-		set l [expr {$j + 1}]
-		$showrefstop.list image create $l.0 -align baseline \
-		    -image reficon-[lindex $refs $j 1] -padx 2
-		$showrefstop.list insert $l.1 "[lindex $refs $j 0]\n"
-		incr j
-	    }
-	}
+        if {$i < [llength $reflist]} {
+            if {$j < [llength $refs]} {
+                set cmp [string compare [lindex $reflist $i 0] \
+                             [lindex $refs $j 0]]
+                if {$cmp == 0} {
+                    set cmp [string compare [lindex $reflist $i 1] \
+                                 [lindex $refs $j 1]]
+                }
+            } else {
+                set cmp -1
+            }
+        } else {
+            set cmp 1
+        }
+        switch -- $cmp {
+            -1 {
+                $showrefstop.list delete "[expr {$j+1}].0" "[expr {$j+2}].0"
+                incr i
+            }
+            0 {
+                incr i
+                incr j
+            }
+            1 {
+                set l [expr {$j + 1}]
+                $showrefstop.list image create $l.0 -align baseline \
+                    -image reficon-[lindex $refs $j 1] -padx 2
+                $showrefstop.list insert $l.1 "[lindex $refs $j 0]\n"
+                incr j
+            }
+        }
     }
     set reflist $refs
     # delete last newline
@@ -10172,54 +10190,54 @@ proc getallcommits {} {
     global gitdir
 
     if {![info exists allcommits]} {
-	set nextarc 0
-	set allcommits 0
-	set seeds {}
-	set allcwait 0
-	set cachedarcs 0
-	set allccache [file join $gitdir "gitk.cache"]
-	if {![catch {
-	    set f [open $allccache r]
-	    set allcwait 1
-	    getcache $f
-	}]} return
+        set nextarc 0
+        set allcommits 0
+        set seeds {}
+        set allcwait 0
+        set cachedarcs 0
+        set allccache [file join $gitdir "gitk.cache"]
+        if {![catch {
+            set f [open $allccache r]
+            set allcwait 1
+            getcache $f
+        }]} return
     }
 
     if {$allcwait} {
-	return
+        return
     }
     set cmd [list | git rev-list --parents]
     set allcupdate [expr {$seeds ne {}}]
     if {!$allcupdate} {
-	set ids "--all"
+        set ids "--all"
     } else {
-	set refs [concat [array names idheads] [array names idtags] \
-		      [array names idotherrefs]]
-	set ids {}
-	set tagobjs {}
-	foreach name [array names tagobjid] {
-	    lappend tagobjs $tagobjid($name)
-	}
-	foreach id [lsort -unique $refs] {
-	    if {![info exists allparents($id)] &&
-		[lsearch -exact $tagobjs $id] < 0} {
-		lappend ids $id
-	    }
-	}
-	if {$ids ne {}} {
-	    foreach id $seeds {
-		lappend ids "^$id"
-	    }
-	}
+        set refs [concat [array names idheads] [array names idtags] \
+                      [array names idotherrefs]]
+        set ids {}
+        set tagobjs {}
+        foreach name [array names tagobjid] {
+            lappend tagobjs $tagobjid($name)
+        }
+        foreach id [lsort -unique $refs] {
+            if {![info exists allparents($id)] &&
+                [lsearch -exact $tagobjs $id] < 0} {
+                lappend ids $id
+            }
+        }
+        if {$ids ne {}} {
+            foreach id $seeds {
+                lappend ids "^$id"
+            }
+        }
     }
     if {$ids ne {}} {
-	set fd [open [concat $cmd $ids] r]
-	fconfigure $fd -blocking 0
-	incr allcommits
-	nowbusy allcommits
-	filerun $fd [list getallclines $fd]
+        set fd [open [concat $cmd $ids] r]
+        fconfigure $fd -blocking 0
+        incr allcommits
+        nowbusy allcommits
+        filerun $fd [list getallclines $fd]
     } else {
-	dispneartags 0
+        dispneartags 0
     }
 }
 
@@ -10245,103 +10263,103 @@ proc getallclines {fd} {
 
     set nid 0
     while {[incr nid] <= 1000 && [gets $fd line] >= 0} {
-	set id [lindex $line 0]
-	if {[info exists allparents($id)]} {
-	    # seen it already
-	    continue
-	}
-	set cachedarcs 0
-	set olds [lrange $line 1 end]
-	set allparents($id) $olds
-	if {![info exists allchildren($id)]} {
-	    set allchildren($id) {}
-	    set arcnos($id) {}
-	    lappend seeds $id
-	} else {
-	    set a $arcnos($id)
-	    if {[llength $olds] == 1 && [llength $a] == 1} {
-		lappend arcids($a) $id
-		if {[info exists idtags($id)]} {
-		    lappend arctags($a) $id
-		}
-		if {[info exists idheads($id)]} {
-		    lappend archeads($a) $id
-		}
-		if {[info exists allparents($olds)]} {
-		    # seen parent already
-		    if {![info exists arcout($olds)]} {
-			splitarc $olds
-		    }
-		    lappend arcids($a) $olds
-		    set arcend($a) $olds
-		    unset growing($a)
-		}
-		lappend allchildren($olds) $id
-		lappend arcnos($olds) $a
-		continue
-	    }
-	}
-	foreach a $arcnos($id) {
-	    lappend arcids($a) $id
-	    set arcend($a) $id
-	    unset growing($a)
-	}
+        set id [lindex $line 0]
+        if {[info exists allparents($id)]} {
+            # seen it already
+            continue
+        }
+        set cachedarcs 0
+        set olds [lrange $line 1 end]
+        set allparents($id) $olds
+        if {![info exists allchildren($id)]} {
+            set allchildren($id) {}
+            set arcnos($id) {}
+            lappend seeds $id
+        } else {
+            set a $arcnos($id)
+            if {[llength $olds] == 1 && [llength $a] == 1} {
+                lappend arcids($a) $id
+                if {[info exists idtags($id)]} {
+                    lappend arctags($a) $id
+                }
+                if {[info exists idheads($id)]} {
+                    lappend archeads($a) $id
+                }
+                if {[info exists allparents($olds)]} {
+                    # seen parent already
+                    if {![info exists arcout($olds)]} {
+                        splitarc $olds
+                    }
+                    lappend arcids($a) $olds
+                    set arcend($a) $olds
+                    unset growing($a)
+                }
+                lappend allchildren($olds) $id
+                lappend arcnos($olds) $a
+                continue
+            }
+        }
+        foreach a $arcnos($id) {
+            lappend arcids($a) $id
+            set arcend($a) $id
+            unset growing($a)
+        }
 
-	set ao {}
-	foreach p $olds {
-	    lappend allchildren($p) $id
-	    set a [incr nextarc]
-	    set arcstart($a) $id
-	    set archeads($a) {}
-	    set arctags($a) {}
-	    set archeads($a) {}
-	    set arcids($a) {}
-	    lappend ao $a
-	    set growing($a) 1
-	    if {[info exists allparents($p)]} {
-		# seen it already, may need to make a new branch
-		if {![info exists arcout($p)]} {
-		    splitarc $p
-		}
-		lappend arcids($a) $p
-		set arcend($a) $p
-		unset growing($a)
-	    }
-	    lappend arcnos($p) $a
-	}
-	set arcout($id) $ao
+        set ao {}
+        foreach p $olds {
+            lappend allchildren($p) $id
+            set a [incr nextarc]
+            set arcstart($a) $id
+            set archeads($a) {}
+            set arctags($a) {}
+            set archeads($a) {}
+            set arcids($a) {}
+            lappend ao $a
+            set growing($a) 1
+            if {[info exists allparents($p)]} {
+                # seen it already, may need to make a new branch
+                if {![info exists arcout($p)]} {
+                    splitarc $p
+                }
+                lappend arcids($a) $p
+                set arcend($a) $p
+                unset growing($a)
+            }
+            lappend arcnos($p) $a
+        }
+        set arcout($id) $ao
     }
     if {$nid > 0} {
-	global cached_dheads cached_dtags cached_atags
-	unset -nocomplain cached_dheads
-	unset -nocomplain cached_dtags
-	unset -nocomplain cached_atags
+        global cached_dheads cached_dtags cached_atags
+        unset -nocomplain cached_dheads
+        unset -nocomplain cached_dtags
+        unset -nocomplain cached_atags
     }
     if {![eof $fd]} {
-	return [expr {$nid >= 1000? 2: 1}]
+        return [expr {$nid >= 1000? 2: 1}]
     }
     set cacheok 1
     if {[catch {
-	fconfigure $fd -blocking 1
-	close $fd
+        fconfigure $fd -blocking 1
+        close $fd
     } err]} {
-	# got an error reading the list of commits
-	# if we were updating, try rereading the whole thing again
-	if {$allcupdate} {
-	    incr allcommits -1
-	    dropcache $err
-	    return
-	}
-	error_popup "[mc "Error reading commit topology information;\
-		branch and preceding/following tag information\
-	        will be incomplete."]\n($err)"
-	set cacheok 0
+        # got an error reading the list of commits
+        # if we were updating, try rereading the whole thing again
+        if {$allcupdate} {
+            incr allcommits -1
+            dropcache $err
+            return
+        }
+        error_popup "[mc "Error reading commit topology information;\
+                branch and preceding/following tag information\
+                will be incomplete."]\n($err)"
+        set cacheok 0
     }
     if {[incr allcommits -1] == 0} {
-	notbusy allcommits
-	if {$cacheok} {
-	    run savecache
-	}
+        notbusy allcommits
+        if {$cacheok} {
+            run savecache
+        }
     }
     dispneartags 0
     return 0
@@ -10353,12 +10371,12 @@ proc recalcarc {a} {
     set at {}
     set ah {}
     foreach id [lrange $arcids($a) 0 end-1] {
-	if {[info exists idtags($id)]} {
-	    lappend at $id
-	}
-	if {[info exists idheads($id)]} {
-	    lappend ah $id
-	}
+        if {[info exists idtags($id)]} {
+            lappend at $id
+        }
+        if {[info exists idheads($id)]} {
+            lappend ah $id
+        }
     }
     set arctags($a) $at
     set archeads($a) $ah
@@ -10370,22 +10388,22 @@ proc splitarc {p} {
 
     set a $arcnos($p)
     if {[llength $a] != 1} {
-	puts "oops splitarc called but [llength $a] arcs already"
-	return
+        puts "oops splitarc called but [llength $a] arcs already"
+        return
     }
     set a [lindex $a 0]
     set i [lsearch -exact $arcids($a) $p]
     if {$i < 0} {
-	puts "oops splitarc $p not in arc $a"
-	return
+        puts "oops splitarc $p not in arc $a"
+        return
     }
     set na [incr nextarc]
     if {[info exists arcend($a)]} {
-	set arcend($na) $arcend($a)
+        set arcend($na) $arcend($a)
     } else {
-	set l [lindex $allparents([lindex $arcids($a) end]) 0]
-	set j [lsearch -exact $arcnos($l) $a]
-	set arcnos($l) [lreplace $arcnos($l) $j $j $na]
+        set l [lindex $allparents([lindex $arcids($a) end]) 0]
+        set j [lsearch -exact $arcnos($l) $a]
+        set arcnos($l) [lreplace $arcnos($l) $j $j $na]
     }
     set tail [lrange $arcids($a) [expr {$i+1}] end]
     set arcids($a) [lrange $arcids($a) 0 $i]
@@ -10394,26 +10412,26 @@ proc splitarc {p} {
     set arcout($p) $na
     set arcids($na) $tail
     if {[info exists growing($a)]} {
-	set growing($na) 1
-	unset growing($a)
+        set growing($na) 1
+        unset growing($a)
     }
 
     foreach id $tail {
-	if {[llength $arcnos($id)] == 1} {
-	    set arcnos($id) $na
-	} else {
-	    set j [lsearch -exact $arcnos($id) $a]
-	    set arcnos($id) [lreplace $arcnos($id) $j $j $na]
-	}
+        if {[llength $arcnos($id)] == 1} {
+            set arcnos($id) $na
+        } else {
+            set j [lsearch -exact $arcnos($id) $a]
+            set arcnos($id) [lreplace $arcnos($id) $j $j $na]
+        }
     }
 
     # reconstruct tags and heads lists
     if {$arctags($a) ne {} || $archeads($a) ne {}} {
-	recalcarc $a
-	recalcarc $na
+        recalcarc $a
+        recalcarc $na
     } else {
-	set arctags($na) {}
-	set archeads($na) {}
+        set arctags($na) {}
+        set archeads($na) {}
     }
 }
 
@@ -10437,7 +10455,7 @@ proc addnewchild {id p} {
     set arcids($a) [list $p]
     set arcend($a) $p
     if {![info exists arcout($p)]} {
-	splitarc $p
+        splitarc $p
     }
     lappend arcnos($p) $a
     set arcout($id) [list $a]
@@ -10454,78 +10472,78 @@ proc readcache {f} {
     set a $nextarc
     set lim $cachedarcs
     if {$lim - $a > 500} {
-	set lim [expr {$a + 500}]
+        set lim [expr {$a + 500}]
     }
     if {[catch {
-	if {$a == $lim} {
-	    # finish reading the cache and setting up arctags, etc.
-	    set line [gets $f]
-	    if {$line ne "1"} {error "bad final version"}
-	    close $f
-	    foreach id [array names idtags] {
-		if {[info exists arcnos($id)] && [llength $arcnos($id)] == 1 &&
-		    [llength $allparents($id)] == 1} {
-		    set a [lindex $arcnos($id) 0]
-		    if {$arctags($a) eq {}} {
-			recalcarc $a
-		    }
-		}
-	    }
-	    foreach id [array names idheads] {
-		if {[info exists arcnos($id)] && [llength $arcnos($id)] == 1 &&
-		    [llength $allparents($id)] == 1} {
-		    set a [lindex $arcnos($id) 0]
-		    if {$archeads($a) eq {}} {
-			recalcarc $a
-		    }
-		}
-	    }
-	    foreach id [lsort -unique $possible_seeds] {
-		if {$arcnos($id) eq {}} {
-		    lappend seeds $id
-		}
-	    }
-	    set allcwait 0
-	} else {
-	    while {[incr a] <= $lim} {
-		set line [gets $f]
-		if {[llength $line] != 3} {error "bad line"}
-		set s [lindex $line 0]
-		set arcstart($a) $s
-		lappend arcout($s) $a
-		if {![info exists arcnos($s)]} {
-		    lappend possible_seeds $s
-		    set arcnos($s) {}
-		}
-		set e [lindex $line 1]
-		if {$e eq {}} {
-		    set growing($a) 1
-		} else {
-		    set arcend($a) $e
-		    if {![info exists arcout($e)]} {
-			set arcout($e) {}
-		    }
-		}
-		set arcids($a) [lindex $line 2]
-		foreach id $arcids($a) {
-		    lappend allparents($s) $id
-		    set s $id
-		    lappend arcnos($id) $a
-		}
-		if {![info exists allparents($s)]} {
-		    set allparents($s) {}
-		}
-		set arctags($a) {}
-		set archeads($a) {}
-	    }
-	    set nextarc [expr {$a - 1}]
-	}
+        if {$a == $lim} {
+            # finish reading the cache and setting up arctags, etc.
+            set line [gets $f]
+            if {$line ne "1"} {error "bad final version"}
+            close $f
+            foreach id [array names idtags] {
+                if {[info exists arcnos($id)] && [llength $arcnos($id)] == 1 &&
+                    [llength $allparents($id)] == 1} {
+                    set a [lindex $arcnos($id) 0]
+                    if {$arctags($a) eq {}} {
+                        recalcarc $a
+                    }
+                }
+            }
+            foreach id [array names idheads] {
+                if {[info exists arcnos($id)] && [llength $arcnos($id)] == 1 &&
+                    [llength $allparents($id)] == 1} {
+                    set a [lindex $arcnos($id) 0]
+                    if {$archeads($a) eq {}} {
+                        recalcarc $a
+                    }
+                }
+            }
+            foreach id [lsort -unique $possible_seeds] {
+                if {$arcnos($id) eq {}} {
+                    lappend seeds $id
+                }
+            }
+            set allcwait 0
+        } else {
+            while {[incr a] <= $lim} {
+                set line [gets $f]
+                if {[llength $line] != 3} {error "bad line"}
+                set s [lindex $line 0]
+                set arcstart($a) $s
+                lappend arcout($s) $a
+                if {![info exists arcnos($s)]} {
+                    lappend possible_seeds $s
+                    set arcnos($s) {}
+                }
+                set e [lindex $line 1]
+                if {$e eq {}} {
+                    set growing($a) 1
+                } else {
+                    set arcend($a) $e
+                    if {![info exists arcout($e)]} {
+                        set arcout($e) {}
+                    }
+                }
+                set arcids($a) [lindex $line 2]
+                foreach id $arcids($a) {
+                    lappend allparents($s) $id
+                    set s $id
+                    lappend arcnos($id) $a
+                }
+                if {![info exists allparents($s)]} {
+                    set allparents($s) {}
+                }
+                set arctags($a) {}
+                set archeads($a) {}
+            }
+            set nextarc [expr {$a - 1}]
+        }
     } err]} {
-	dropcache $err
-	return 0
+        dropcache $err
+        return 0
     }
     if {!$allcwait} {
-	getallcommits
+        getallcommits
     }
     return $allcwait
 }
@@ -10534,16 +10552,16 @@ proc getcache {f} {
     global nextarc cachedarcs possible_seeds
 
     if {[catch {
-	set line [gets $f]
-	if {[llength $line] != 2 || [lindex $line 0] ne "1"} {error "bad version"}
-	# make sure it's an integer
-	set cachedarcs [expr {int([lindex $line 1])}]
-	if {$cachedarcs < 0} {error "bad number of arcs"}
-	set nextarc 0
-	set possible_seeds {}
-	run readcache $f
+        set line [gets $f]
+        if {[llength $line] != 2 || [lindex $line 0] ne "1"} {error "bad version"}
+        # make sure it's an integer
+        set cachedarcs [expr {int([lindex $line 1])}]
+        if {$cachedarcs < 0} {error "bad number of arcs"}
+        set nextarc 0
+        set possible_seeds {}
+        run readcache $f
     } err]} {
-	dropcache $err
+        dropcache $err
     }
     return 0
 }
@@ -10553,9 +10571,9 @@ proc dropcache {err} {
 
     #puts "dropping cache ($err)"
     foreach v {arcnos arcout arcids arcstart arcend growing \
-		   arctags archeads allparents allchildren} {
-	global $v
-	unset -nocomplain $v
+                   arctags archeads allparents allchildren} {
+        global $v
+        unset -nocomplain $v
     }
     set allcwait 0
     set nextarc 0
@@ -10571,27 +10589,27 @@ proc writecache {f} {
     set a $cachearc
     set lim $cachedarcs
     if {$lim - $a > 1000} {
-	set lim [expr {$a + 1000}]
+        set lim [expr {$a + 1000}]
     }
     if {[catch {
-	while {[incr a] <= $lim} {
-	    if {[info exists arcend($a)]} {
-		puts $f [list $arcstart($a) $arcend($a) $arcids($a)]
-	    } else {
-		puts $f [list $arcstart($a) {} $arcids($a)]
-	    }
-	}
+        while {[incr a] <= $lim} {
+            if {[info exists arcend($a)]} {
+                puts $f [list $arcstart($a) $arcend($a) $arcids($a)]
+            } else {
+                puts $f [list $arcstart($a) {} $arcids($a)]
+            }
+        }
     } err]} {
-	catch {close $f}
-	catch {file delete $allccache}
-	#puts "writing cache failed ($err)"
-	return 0
+        catch {close $f}
+        catch {file delete $allccache}
+        #puts "writing cache failed ($err)"
+        return 0
     }
     set cachearc [expr {$a - 1}]
     if {$a > $cachedarcs} {
-	puts $f "1"
-	close $f
-	return 0
+        puts $f "1"
+        close $f
+        return 0
     }
     return 1
 }
@@ -10603,9 +10621,9 @@ proc savecache {} {
     set cachearc 0
     set cachedarcs $nextarc
     catch {
-	set f [open $allccache w]
-	puts $f [list 1 $cachedarcs]
-	run writecache $f
+        set f [open $allccache w]
+        puts $f [list 1 $cachedarcs]
+        run writecache $f
     }
 }
 
@@ -10615,92 +10633,92 @@ proc anc_or_desc {a b} {
     global arcout arcstart arcend arcnos cached_isanc
 
     if {$arcnos($a) eq $arcnos($b)} {
-	# Both are on the same arc(s); either both are the same BMP,
-	# or if one is not a BMP, the other is also not a BMP or is
-	# the BMP at end of the arc (and it only has 1 incoming arc).
-	# Or both can be BMPs with no incoming arcs.
-	if {$a eq $b || $arcnos($a) eq {}} {
-	    return 0
-	}
-	# assert {[llength $arcnos($a)] == 1}
-	set arc [lindex $arcnos($a) 0]
-	set i [lsearch -exact $arcids($arc) $a]
-	set j [lsearch -exact $arcids($arc) $b]
-	if {$i < 0 || $i > $j} {
-	    return 1
-	} else {
-	    return -1
-	}
+        # Both are on the same arc(s); either both are the same BMP,
+        # or if one is not a BMP, the other is also not a BMP or is
+        # the BMP at end of the arc (and it only has 1 incoming arc).
+        # Or both can be BMPs with no incoming arcs.
+        if {$a eq $b || $arcnos($a) eq {}} {
+            return 0
+        }
+        # assert {[llength $arcnos($a)] == 1}
+        set arc [lindex $arcnos($a) 0]
+        set i [lsearch -exact $arcids($arc) $a]
+        set j [lsearch -exact $arcids($arc) $b]
+        if {$i < 0 || $i > $j} {
+            return 1
+        } else {
+            return -1
+        }
     }
 
     if {![info exists arcout($a)]} {
-	set arc [lindex $arcnos($a) 0]
-	if {[info exists arcend($arc)]} {
-	    set aend $arcend($arc)
-	} else {
-	    set aend {}
-	}
-	set a $arcstart($arc)
+        set arc [lindex $arcnos($a) 0]
+        if {[info exists arcend($arc)]} {
+            set aend $arcend($arc)
+        } else {
+            set aend {}
+        }
+        set a $arcstart($arc)
     } else {
-	set aend $a
+        set aend $a
     }
     if {![info exists arcout($b)]} {
-	set arc [lindex $arcnos($b) 0]
-	if {[info exists arcend($arc)]} {
-	    set bend $arcend($arc)
-	} else {
-	    set bend {}
-	}
-	set b $arcstart($arc)
+        set arc [lindex $arcnos($b) 0]
+        if {[info exists arcend($arc)]} {
+            set bend $arcend($arc)
+        } else {
+            set bend {}
+        }
+        set b $arcstart($arc)
     } else {
-	set bend $b
+        set bend $b
     }
     if {$a eq $bend} {
-	return 1
+        return 1
     }
     if {$b eq $aend} {
-	return -1
+        return -1
     }
     if {[info exists cached_isanc($a,$bend)]} {
-	if {$cached_isanc($a,$bend)} {
-	    return 1
-	}
+        if {$cached_isanc($a,$bend)} {
+            return 1
+        }
     }
     if {[info exists cached_isanc($b,$aend)]} {
-	if {$cached_isanc($b,$aend)} {
-	    return -1
-	}
-	if {[info exists cached_isanc($a,$bend)]} {
-	    return 0
-	}
+        if {$cached_isanc($b,$aend)} {
+            return -1
+        }
+        if {[info exists cached_isanc($a,$bend)]} {
+            return 0
+        }
     }
 
     set todo [list $a $b]
     set anc($a) a
     set anc($b) b
     for {set i 0} {$i < [llength $todo]} {incr i} {
-	set x [lindex $todo $i]
-	if {$anc($x) eq {}} {
-	    continue
-	}
-	foreach arc $arcnos($x) {
-	    set xd $arcstart($arc)
-	    if {$xd eq $bend} {
-		set cached_isanc($a,$bend) 1
-		set cached_isanc($b,$aend) 0
-		return 1
-	    } elseif {$xd eq $aend} {
-		set cached_isanc($b,$aend) 1
-		set cached_isanc($a,$bend) 0
-		return -1
-	    }
-	    if {![info exists anc($xd)]} {
-		set anc($xd) $anc($x)
-		lappend todo $xd
-	    } elseif {$anc($xd) ne $anc($x)} {
-		set anc($xd) {}
-	    }
-	}
+        set x [lindex $todo $i]
+        if {$anc($x) eq {}} {
+            continue
+        }
+        foreach arc $arcnos($x) {
+            set xd $arcstart($arc)
+            if {$xd eq $bend} {
+                set cached_isanc($a,$bend) 1
+                set cached_isanc($b,$aend) 0
+                return 1
+            } elseif {$xd eq $aend} {
+                set cached_isanc($b,$aend) 1
+                set cached_isanc($a,$bend) 0
+                return -1
+            }
+            if {![info exists anc($xd)]} {
+                set anc($xd) $anc($x)
+                lappend todo $xd
+            } elseif {$anc($xd) ne $anc($x)} {
+                set anc($xd) {}
+            }
+        }
     }
     set cached_isanc($a,$bend) 0
     set cached_isanc($b,$aend) 0
@@ -10723,90 +10741,90 @@ proc is_certain {desc anc} {
 
     set certain {}
     if {[llength $arcnos($anc)] == 1} {
-	# tags on the same arc are certain
-	if {$arcnos($desc) eq $arcnos($anc)} {
-	    return 1
-	}
-	if {![info exists arcout($anc)]} {
-	    # if $anc is partway along an arc, use the start of the arc instead
-	    set a [lindex $arcnos($anc) 0]
-	    set anc $arcstart($a)
-	}
+        # tags on the same arc are certain
+        if {$arcnos($desc) eq $arcnos($anc)} {
+            return 1
+        }
+        if {![info exists arcout($anc)]} {
+            # if $anc is partway along an arc, use the start of the arc instead
+            set a [lindex $arcnos($anc) 0]
+            set anc $arcstart($a)
+        }
     }
     if {[llength $arcnos($desc)] > 1 || [info exists arcout($desc)]} {
-	set x $desc
+        set x $desc
     } else {
-	set a [lindex $arcnos($desc) 0]
-	set x $arcend($a)
+        set a [lindex $arcnos($desc) 0]
+        set x $arcend($a)
     }
     if {$x == $anc} {
-	return 1
+        return 1
     }
     set anclist [list $x]
     set dl($x) 1
     set nnh 1
     set ngrowanc 0
     for {set i 0} {$i < [llength $anclist] && ($nnh > 0 || $ngrowanc > 0)} {incr i} {
-	set x [lindex $anclist $i]
-	if {$dl($x)} {
-	    incr nnh -1
-	}
-	set done($x) 1
-	foreach a $arcout($x) {
-	    if {[info exists growing($a)]} {
-		if {![info exists growanc($x)] && $dl($x)} {
-		    set growanc($x) 1
-		    incr ngrowanc
-		}
-	    } else {
-		set y $arcend($a)
-		if {[info exists dl($y)]} {
-		    if {$dl($y)} {
-			if {!$dl($x)} {
-			    set dl($y) 0
-			    if {![info exists done($y)]} {
-				incr nnh -1
-			    }
-			    if {[info exists growanc($x)]} {
-				incr ngrowanc -1
-			    }
-			    set xl [list $y]
-			    for {set k 0} {$k < [llength $xl]} {incr k} {
-				set z [lindex $xl $k]
-				foreach c $arcout($z) {
-				    if {[info exists arcend($c)]} {
-					set v $arcend($c)
-					if {[info exists dl($v)] && $dl($v)} {
-					    set dl($v) 0
-					    if {![info exists done($v)]} {
-						incr nnh -1
-					    }
-					    if {[info exists growanc($v)]} {
-						incr ngrowanc -1
-					    }
-					    lappend xl $v
-					}
-				    }
-				}
-			    }
-			}
-		    }
-		} elseif {$y eq $anc || !$dl($x)} {
-		    set dl($y) 0
-		    lappend anclist $y
-		} else {
-		    set dl($y) 1
-		    lappend anclist $y
-		    incr nnh
-		}
-	    }
-	}
+        set x [lindex $anclist $i]
+        if {$dl($x)} {
+            incr nnh -1
+        }
+        set done($x) 1
+        foreach a $arcout($x) {
+            if {[info exists growing($a)]} {
+                if {![info exists growanc($x)] && $dl($x)} {
+                    set growanc($x) 1
+                    incr ngrowanc
+                }
+            } else {
+                set y $arcend($a)
+                if {[info exists dl($y)]} {
+                    if {$dl($y)} {
+                        if {!$dl($x)} {
+                            set dl($y) 0
+                            if {![info exists done($y)]} {
+                                incr nnh -1
+                            }
+                            if {[info exists growanc($x)]} {
+                                incr ngrowanc -1
+                            }
+                            set xl [list $y]
+                            for {set k 0} {$k < [llength $xl]} {incr k} {
+                                set z [lindex $xl $k]
+                                foreach c $arcout($z) {
+                                    if {[info exists arcend($c)]} {
+                                        set v $arcend($c)
+                                        if {[info exists dl($v)] && $dl($v)} {
+                                            set dl($v) 0
+                                            if {![info exists done($v)]} {
+                                                incr nnh -1
+                                            }
+                                            if {[info exists growanc($v)]} {
+                                                incr ngrowanc -1
+                                            }
+                                            lappend xl $v
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                } elseif {$y eq $anc || !$dl($x)} {
+                    set dl($y) 0
+                    lappend anclist $y
+                } else {
+                    set dl($y) 1
+                    lappend anclist $y
+                    incr nnh
+                }
+            }
+        }
     }
     foreach x [array names growanc] {
-	if {$dl($x)} {
-	    return 0
-	}
-	return 0
+        if {$dl($x)} {
+            return 0
+        }
+        return 0
     }
     return 1
 }
@@ -10817,11 +10835,11 @@ proc validate_arctags {a} {
     set i -1
     set na $arctags($a)
     foreach id $arctags($a) {
-	incr i
-	if {![info exists idtags($id)]} {
-	    set na [lreplace $na $i $i]
-	    incr i -1
-	}
+        incr i
+        if {![info exists idtags($id)]} {
+            set na [lreplace $na $i $i]
+            incr i -1
+        }
     }
     set arctags($a) $na
 }
@@ -10832,11 +10850,11 @@ proc validate_archeads {a} {
     set i -1
     set na $archeads($a)
     foreach id $archeads($a) {
-	incr i
-	if {![info exists idheads($id)]} {
-	    set na [lreplace $na $i $i]
-	    incr i -1
-	}
+        incr i
+        if {![info exists idheads($id)]} {
+            set na [lreplace $na $i $i]
+            incr i -1
+        }
     }
     set archeads($a) $na
 }
@@ -10848,33 +10866,33 @@ proc desctags {id} {
     global growing cached_dtags
 
     if {![info exists allparents($id)]} {
-	return {}
+        return {}
     }
     set t1 [clock clicks -milliseconds]
     set argid $id
     if {[llength $arcnos($id)] == 1 && [llength $allparents($id)] == 1} {
-	# part-way along an arc; check that arc first
-	set a [lindex $arcnos($id) 0]
-	if {$arctags($a) ne {}} {
-	    validate_arctags $a
-	    set i [lsearch -exact $arcids($a) $id]
-	    set tid {}
-	    foreach t $arctags($a) {
-		set j [lsearch -exact $arcids($a) $t]
-		if {$j >= $i} break
-		set tid $t
-	    }
-	    if {$tid ne {}} {
-		return $tid
-	    }
-	}
-	set id $arcstart($a)
-	if {[info exists idtags($id)]} {
-	    return $id
-	}
+        # part-way along an arc; check that arc first
+        set a [lindex $arcnos($id) 0]
+        if {$arctags($a) ne {}} {
+            validate_arctags $a
+            set i [lsearch -exact $arcids($a) $id]
+            set tid {}
+            foreach t $arctags($a) {
+                set j [lsearch -exact $arcids($a) $t]
+                if {$j >= $i} break
+                set tid $t
+            }
+            if {$tid ne {}} {
+                return $tid
+            }
+        }
+        set id $arcstart($a)
+        if {[info exists idtags($id)]} {
+            return $id
+        }
     }
     if {[info exists cached_dtags($id)]} {
-	return $cached_dtags($id)
+        return $cached_dtags($id)
     }
 
     set origid $id
@@ -10882,111 +10900,111 @@ proc desctags {id} {
     set queued($id) 1
     set nc 1
     for {set i 0} {$i < [llength $todo] && $nc > 0} {incr i} {
-	set id [lindex $todo $i]
-	set done($id) 1
-	set ta [info exists hastaggedancestor($id)]
-	if {!$ta} {
-	    incr nc -1
-	}
-	# ignore tags on starting node
-	if {!$ta && $i > 0} {
-	    if {[info exists idtags($id)]} {
-		set tagloc($id) $id
-		set ta 1
-	    } elseif {[info exists cached_dtags($id)]} {
-		set tagloc($id) $cached_dtags($id)
-		set ta 1
-	    }
-	}
-	foreach a $arcnos($id) {
-	    set d $arcstart($a)
-	    if {!$ta && $arctags($a) ne {}} {
-		validate_arctags $a
-		if {$arctags($a) ne {}} {
-		    lappend tagloc($id) [lindex $arctags($a) end]
-		}
-	    }
-	    if {$ta || $arctags($a) ne {}} {
-		set tomark [list $d]
-		for {set j 0} {$j < [llength $tomark]} {incr j} {
-		    set dd [lindex $tomark $j]
-		    if {![info exists hastaggedancestor($dd)]} {
-			if {[info exists done($dd)]} {
-			    foreach b $arcnos($dd) {
-				lappend tomark $arcstart($b)
-			    }
-			    if {[info exists tagloc($dd)]} {
-				unset tagloc($dd)
-			    }
-			} elseif {[info exists queued($dd)]} {
-			    incr nc -1
-			}
-			set hastaggedancestor($dd) 1
-		    }
-		}
-	    }
-	    if {![info exists queued($d)]} {
-		lappend todo $d
-		set queued($d) 1
-		if {![info exists hastaggedancestor($d)]} {
-		    incr nc
-		}
-	    }
-	}
+        set id [lindex $todo $i]
+        set done($id) 1
+        set ta [info exists hastaggedancestor($id)]
+        if {!$ta} {
+            incr nc -1
+        }
+        # ignore tags on starting node
+        if {!$ta && $i > 0} {
+            if {[info exists idtags($id)]} {
+                set tagloc($id) $id
+                set ta 1
+            } elseif {[info exists cached_dtags($id)]} {
+                set tagloc($id) $cached_dtags($id)
+                set ta 1
+            }
+        }
+        foreach a $arcnos($id) {
+            set d $arcstart($a)
+            if {!$ta && $arctags($a) ne {}} {
+                validate_arctags $a
+                if {$arctags($a) ne {}} {
+                    lappend tagloc($id) [lindex $arctags($a) end]
+                }
+            }
+            if {$ta || $arctags($a) ne {}} {
+                set tomark [list $d]
+                for {set j 0} {$j < [llength $tomark]} {incr j} {
+                    set dd [lindex $tomark $j]
+                    if {![info exists hastaggedancestor($dd)]} {
+                        if {[info exists done($dd)]} {
+                            foreach b $arcnos($dd) {
+                                lappend tomark $arcstart($b)
+                            }
+                            if {[info exists tagloc($dd)]} {
+                                unset tagloc($dd)
+                            }
+                        } elseif {[info exists queued($dd)]} {
+                            incr nc -1
+                        }
+                        set hastaggedancestor($dd) 1
+                    }
+                }
+            }
+            if {![info exists queued($d)]} {
+                lappend todo $d
+                set queued($d) 1
+                if {![info exists hastaggedancestor($d)]} {
+                    incr nc
+                }
+            }
+        }
     }
     set tags {}
     foreach id [array names tagloc] {
-	if {![info exists hastaggedancestor($id)]} {
-	    foreach t $tagloc($id) {
-		if {[lsearch -exact $tags $t] < 0} {
-		    lappend tags $t
-		}
-	    }
-	}
+        if {![info exists hastaggedancestor($id)]} {
+            foreach t $tagloc($id) {
+                if {[lsearch -exact $tags $t] < 0} {
+                    lappend tags $t
+                }
+            }
+        }
     }
     set t2 [clock clicks -milliseconds]
     set loopix $i
 
     # remove tags that are descendents of other tags
     for {set i 0} {$i < [llength $tags]} {incr i} {
-	set a [lindex $tags $i]
-	for {set j 0} {$j < $i} {incr j} {
-	    set b [lindex $tags $j]
-	    set r [anc_or_desc $a $b]
-	    if {$r == 1} {
-		set tags [lreplace $tags $j $j]
-		incr j -1
-		incr i -1
-	    } elseif {$r == -1} {
-		set tags [lreplace $tags $i $i]
-		incr i -1
-		break
-	    }
-	}
+        set a [lindex $tags $i]
+        for {set j 0} {$j < $i} {incr j} {
+            set b [lindex $tags $j]
+            set r [anc_or_desc $a $b]
+            if {$r == 1} {
+                set tags [lreplace $tags $j $j]
+                incr j -1
+                incr i -1
+            } elseif {$r == -1} {
+                set tags [lreplace $tags $i $i]
+                incr i -1
+                break
+            }
+        }
     }
 
     if {[array names growing] ne {}} {
-	# graph isn't finished, need to check if any tag could get
-	# eclipsed by another tag coming later.  Simply ignore any
-	# tags that could later get eclipsed.
-	set ctags {}
-	foreach t $tags {
-	    if {[is_certain $t $origid]} {
-		lappend ctags $t
-	    }
-	}
-	if {$tags eq $ctags} {
-	    set cached_dtags($origid) $tags
-	} else {
-	    set tags $ctags
-	}
+        # graph isn't finished, need to check if any tag could get
+        # eclipsed by another tag coming later.  Simply ignore any
+        # tags that could later get eclipsed.
+        set ctags {}
+        foreach t $tags {
+            if {[is_certain $t $origid]} {
+                lappend ctags $t
+            }
+        }
+        if {$tags eq $ctags} {
+            set cached_dtags($origid) $tags
+        } else {
+            set tags $ctags
+        }
     } else {
-	set cached_dtags($origid) $tags
+        set cached_dtags($origid) $tags
     }
     set t3 [clock clicks -milliseconds]
     if {0 && $t3 - $t1 >= 100} {
-	puts "iterating descendents ($loopix/[llength $todo] nodes) took\
-    	    [expr {$t2-$t1}]+[expr {$t3-$t2}]ms, $nc candidates left"
+        puts "iterating descendents ($loopix/[llength $todo] nodes) took\
+            [expr {$t2-$t1}]+[expr {$t3-$t2}]ms, $nc candidates left"
     }
     return $tags
 }
@@ -10996,33 +11014,33 @@ proc anctags {id} {
     global growing cached_atags
 
     if {![info exists allparents($id)]} {
-	return {}
+        return {}
     }
     set t1 [clock clicks -milliseconds]
     set argid $id
     if {[llength $arcnos($id)] == 1 && [llength $allparents($id)] == 1} {
-	# part-way along an arc; check that arc first
-	set a [lindex $arcnos($id) 0]
-	if {$arctags($a) ne {}} {
-	    validate_arctags $a
-	    set i [lsearch -exact $arcids($a) $id]
-	    foreach t $arctags($a) {
-		set j [lsearch -exact $arcids($a) $t]
-		if {$j > $i} {
-		    return $t
-		}
-	    }
-	}
-	if {![info exists arcend($a)]} {
-	    return {}
-	}
-	set id $arcend($a)
-	if {[info exists idtags($id)]} {
-	    return $id
-	}
+        # part-way along an arc; check that arc first
+        set a [lindex $arcnos($id) 0]
+        if {$arctags($a) ne {}} {
+            validate_arctags $a
+            set i [lsearch -exact $arcids($a) $id]
+            foreach t $arctags($a) {
+                set j [lsearch -exact $arcids($a) $t]
+                if {$j > $i} {
+                    return $t
+                }
+            }
+        }
+        if {![info exists arcend($a)]} {
+            return {}
+        }
+        set id $arcend($a)
+        if {[info exists idtags($id)]} {
+            return $id
+        }
     }
     if {[info exists cached_atags($id)]} {
-	return $cached_atags($id)
+        return $cached_atags($id)
     }
 
     set origid $id
@@ -11031,114 +11049,114 @@ proc anctags {id} {
     set taglist {}
     set nc 1
     for {set i 0} {$i < [llength $todo] && $nc > 0} {incr i} {
-	set id [lindex $todo $i]
-	set done($id) 1
-	set td [info exists hastaggeddescendent($id)]
-	if {!$td} {
-	    incr nc -1
-	}
-	# ignore tags on starting node
-	if {!$td && $i > 0} {
-	    if {[info exists idtags($id)]} {
-		set tagloc($id) $id
-		set td 1
-	    } elseif {[info exists cached_atags($id)]} {
-		set tagloc($id) $cached_atags($id)
-		set td 1
-	    }
-	}
-	foreach a $arcout($id) {
-	    if {!$td && $arctags($a) ne {}} {
-		validate_arctags $a
-		if {$arctags($a) ne {}} {
-		    lappend tagloc($id) [lindex $arctags($a) 0]
-		}
-	    }
-	    if {![info exists arcend($a)]} continue
-	    set d $arcend($a)
-	    if {$td || $arctags($a) ne {}} {
-		set tomark [list $d]
-		for {set j 0} {$j < [llength $tomark]} {incr j} {
-		    set dd [lindex $tomark $j]
-		    if {![info exists hastaggeddescendent($dd)]} {
-			if {[info exists done($dd)]} {
-			    foreach b $arcout($dd) {
-				if {[info exists arcend($b)]} {
-				    lappend tomark $arcend($b)
-				}
-			    }
-			    if {[info exists tagloc($dd)]} {
-				unset tagloc($dd)
-			    }
-			} elseif {[info exists queued($dd)]} {
-			    incr nc -1
-			}
-			set hastaggeddescendent($dd) 1
-		    }
-		}
-	    }
-	    if {![info exists queued($d)]} {
-		lappend todo $d
-		set queued($d) 1
-		if {![info exists hastaggeddescendent($d)]} {
-		    incr nc
-		}
-	    }
-	}
+        set id [lindex $todo $i]
+        set done($id) 1
+        set td [info exists hastaggeddescendent($id)]
+        if {!$td} {
+            incr nc -1
+        }
+        # ignore tags on starting node
+        if {!$td && $i > 0} {
+            if {[info exists idtags($id)]} {
+                set tagloc($id) $id
+                set td 1
+            } elseif {[info exists cached_atags($id)]} {
+                set tagloc($id) $cached_atags($id)
+                set td 1
+            }
+        }
+        foreach a $arcout($id) {
+            if {!$td && $arctags($a) ne {}} {
+                validate_arctags $a
+                if {$arctags($a) ne {}} {
+                    lappend tagloc($id) [lindex $arctags($a) 0]
+                }
+            }
+            if {![info exists arcend($a)]} continue
+            set d $arcend($a)
+            if {$td || $arctags($a) ne {}} {
+                set tomark [list $d]
+                for {set j 0} {$j < [llength $tomark]} {incr j} {
+                    set dd [lindex $tomark $j]
+                    if {![info exists hastaggeddescendent($dd)]} {
+                        if {[info exists done($dd)]} {
+                            foreach b $arcout($dd) {
+                                if {[info exists arcend($b)]} {
+                                    lappend tomark $arcend($b)
+                                }
+                            }
+                            if {[info exists tagloc($dd)]} {
+                                unset tagloc($dd)
+                            }
+                        } elseif {[info exists queued($dd)]} {
+                            incr nc -1
+                        }
+                        set hastaggeddescendent($dd) 1
+                    }
+                }
+            }
+            if {![info exists queued($d)]} {
+                lappend todo $d
+                set queued($d) 1
+                if {![info exists hastaggeddescendent($d)]} {
+                    incr nc
+                }
+            }
+        }
     }
     set t2 [clock clicks -milliseconds]
     set loopix $i
     set tags {}
     foreach id [array names tagloc] {
-	if {![info exists hastaggeddescendent($id)]} {
-	    foreach t $tagloc($id) {
-		if {[lsearch -exact $tags $t] < 0} {
-		    lappend tags $t
-		}
-	    }
-	}
+        if {![info exists hastaggeddescendent($id)]} {
+            foreach t $tagloc($id) {
+                if {[lsearch -exact $tags $t] < 0} {
+                    lappend tags $t
+                }
+            }
+        }
     }
 
     # remove tags that are ancestors of other tags
     for {set i 0} {$i < [llength $tags]} {incr i} {
-	set a [lindex $tags $i]
-	for {set j 0} {$j < $i} {incr j} {
-	    set b [lindex $tags $j]
-	    set r [anc_or_desc $a $b]
-	    if {$r == -1} {
-		set tags [lreplace $tags $j $j]
-		incr j -1
-		incr i -1
-	    } elseif {$r == 1} {
-		set tags [lreplace $tags $i $i]
-		incr i -1
-		break
-	    }
-	}
+        set a [lindex $tags $i]
+        for {set j 0} {$j < $i} {incr j} {
+            set b [lindex $tags $j]
+            set r [anc_or_desc $a $b]
+            if {$r == -1} {
+                set tags [lreplace $tags $j $j]
+                incr j -1
+                incr i -1
+            } elseif {$r == 1} {
+                set tags [lreplace $tags $i $i]
+                incr i -1
+                break
+            }
+        }
     }
 
     if {[array names growing] ne {}} {
-	# graph isn't finished, need to check if any tag could get
-	# eclipsed by another tag coming later.  Simply ignore any
-	# tags that could later get eclipsed.
-	set ctags {}
-	foreach t $tags {
-	    if {[is_certain $origid $t]} {
-		lappend ctags $t
-	    }
-	}
-	if {$tags eq $ctags} {
-	    set cached_atags($origid) $tags
-	} else {
-	    set tags $ctags
-	}
+        # graph isn't finished, need to check if any tag could get
+        # eclipsed by another tag coming later.  Simply ignore any
+        # tags that could later get eclipsed.
+        set ctags {}
+        foreach t $tags {
+            if {[is_certain $origid $t]} {
+                lappend ctags $t
+            }
+        }
+        if {$tags eq $ctags} {
+            set cached_atags($origid) $tags
+        } else {
+            set tags $ctags
+        }
     } else {
-	set cached_atags($origid) $tags
+        set cached_atags($origid) $tags
     }
     set t3 [clock clicks -milliseconds]
     if {0 && $t3 - $t1 >= 100} {
-	puts "iterating ancestors ($loopix/[llength $todo] nodes) took\
-    	    [expr {$t2-$t1}]+[expr {$t3-$t2}]ms, $nc candidates left"
+        puts "iterating ancestors ($loopix/[llength $todo] nodes) took\
+            [expr {$t2-$t1}]+[expr {$t3-$t2}]ms, $nc candidates left"
     }
     return $tags
 }
@@ -11150,49 +11168,49 @@ proc descheads {id} {
     global allparents arcout
 
     if {![info exists allparents($id)]} {
-	return {}
+        return {}
     }
     set aret {}
     if {![info exists arcout($id)]} {
-	# part-way along an arc; check it first
-	set a [lindex $arcnos($id) 0]
-	if {$archeads($a) ne {}} {
-	    validate_archeads $a
-	    set i [lsearch -exact $arcids($a) $id]
-	    foreach t $archeads($a) {
-		set j [lsearch -exact $arcids($a) $t]
-		if {$j > $i} break
-		lappend aret $t
-	    }
-	}
-	set id $arcstart($a)
+        # part-way along an arc; check it first
+        set a [lindex $arcnos($id) 0]
+        if {$archeads($a) ne {}} {
+            validate_archeads $a
+            set i [lsearch -exact $arcids($a) $id]
+            foreach t $archeads($a) {
+                set j [lsearch -exact $arcids($a) $t]
+                if {$j > $i} break
+                lappend aret $t
+            }
+        }
+        set id $arcstart($a)
     }
     set origid $id
     set todo [list $id]
     set seen($id) 1
     set ret {}
     for {set i 0} {$i < [llength $todo]} {incr i} {
-	set id [lindex $todo $i]
-	if {[info exists cached_dheads($id)]} {
-	    set ret [concat $ret $cached_dheads($id)]
-	} else {
-	    if {[info exists idheads($id)]} {
-		lappend ret $id
-	    }
-	    foreach a $arcnos($id) {
-		if {$archeads($a) ne {}} {
-		    validate_archeads $a
-		    if {$archeads($a) ne {}} {
-			set ret [concat $ret $archeads($a)]
-		    }
-		}
-		set d $arcstart($a)
-		if {![info exists seen($d)]} {
-		    lappend todo $d
-		    set seen($d) 1
-		}
-	    }
-	}
+        set id [lindex $todo $i]
+        if {[info exists cached_dheads($id)]} {
+            set ret [concat $ret $cached_dheads($id)]
+        } else {
+            if {[info exists idheads($id)]} {
+                lappend ret $id
+            }
+            foreach a $arcnos($id) {
+                if {$archeads($a) ne {}} {
+                    validate_archeads $a
+                    if {$archeads($a) ne {}} {
+                        set ret [concat $ret $archeads($a)]
+                    }
+                }
+                set d $arcstart($a)
+                if {![info exists seen($d)]} {
+                    lappend todo $d
+                    set seen($d) 1
+                }
+            }
+        }
     }
     set ret [lsort -unique $ret]
     set cached_dheads($origid) $ret
@@ -11204,7 +11222,7 @@ proc addedtag {id} {
 
     if {![info exists arcnos($id)]} return
     if {![info exists arcout($id)]} {
-	recalcarc [lindex $arcnos($id) 0]
+        recalcarc [lindex $arcnos($id) 0]
     }
     unset -nocomplain cached_dtags
     unset -nocomplain cached_atags
@@ -11215,7 +11233,7 @@ proc addedhead {hid head} {
 
     if {![info exists arcnos($hid)]} return
     if {![info exists arcout($hid)]} {
-	recalcarc [lindex $arcnos($hid) 0]
+        recalcarc [lindex $arcnos($hid) 0]
     }
     unset -nocomplain cached_dheads
 }
@@ -11231,7 +11249,7 @@ proc movedhead {hid head} {
 
     if {![info exists arcnos($hid)]} return
     if {![info exists arcout($hid)]} {
-	recalcarc [lindex $arcnos($hid) 0]
+        recalcarc [lindex $arcnos($hid) 0]
     }
     unset -nocomplain cached_dheads
 }
@@ -11241,13 +11259,13 @@ proc changedrefs {} {
     global arctags archeads arcnos arcout idheads idtags
 
     foreach id [concat [array names idheads] [array names idtags]] {
-	if {[info exists arcnos($id)] && ![info exists arcout($id)]} {
-	    set a [lindex $arcnos($id) 0]
-	    if {![info exists donearc($a)]} {
-		recalcarc $a
-		set donearc($a) 1
-	    }
-	}
+        if {[info exists arcnos($id)] && ![info exists arcout($id)]} {
+            set a [lindex $arcnos($id) 0]
+            if {![info exists donearc($a)]} {
+                recalcarc $a
+                set donearc($a) 1
+            }
+        }
     }
     unset -nocomplain cached_tagcontent
     unset -nocomplain cached_dtags
@@ -11259,26 +11277,26 @@ proc rereadrefs {} {
     global idtags idheads idotherrefs mainheadid
 
     set refids [concat [array names idtags] \
-		    [array names idheads] [array names idotherrefs]]
+                    [array names idheads] [array names idotherrefs]]
     foreach id $refids {
-	if {![info exists ref($id)]} {
-	    set ref($id) [listrefs $id]
-	}
+        if {![info exists ref($id)]} {
+            set ref($id) [listrefs $id]
+        }
     }
     set oldmainhead $mainheadid
     readrefs
     changedrefs
     set refids [lsort -unique [concat $refids [array names idtags] \
-			[array names idheads] [array names idotherrefs]]]
+                        [array names idheads] [array names idotherrefs]]]
     foreach id $refids {
-	set v [listrefs $id]
-	if {![info exists ref($id)] || $ref($id) != $v} {
-	    redrawtags $id
-	}
+        set v [listrefs $id]
+        if {![info exists ref($id)] || $ref($id) != $v} {
+            redrawtags $id
+        }
     }
     if {$oldmainhead ne $mainheadid} {
-	redrawtags $oldmainhead
-	redrawtags $mainheadid
+        redrawtags $oldmainhead
+        redrawtags $mainheadid
     }
     run refill_reflist
 }
@@ -11288,15 +11306,15 @@ proc listrefs {id} {
 
     set x {}
     if {[info exists idtags($id)]} {
-	set x $idtags($id)
+        set x $idtags($id)
     }
     set y {}
     if {[info exists idheads($id)]} {
-	set y $idheads($id)
+        set y $idheads($id)
     }
     set z {}
     if {[info exists idotherrefs($id)]} {
-	set z $idotherrefs($id)
+        set z $idotherrefs($id)
     }
     return [list $x $y $z]
 }
@@ -11305,15 +11323,15 @@ proc add_tag_ctext {tag} {
     global ctext cached_tagcontent tagids
 
     if {![info exists cached_tagcontent($tag)]} {
-	catch {
-	    set cached_tagcontent($tag) [exec git cat-file -p $tag]
-	}
+        catch {
+            set cached_tagcontent($tag) [exec git cat-file -p $tag]
+        }
     }
     $ctext insert end "[mc "Tag"]: $tag\n" bold
     if {[info exists cached_tagcontent($tag)]} {
-	set text $cached_tagcontent($tag)
+        set text $cached_tagcontent($tag)
     } else {
-	set text "[mc "Id"]:  $tagids($tag)"
+        set text "[mc "Id"]:  $tagids($tag)"
     }
     appendwithlinks $text {}
 }
@@ -11322,7 +11340,7 @@ proc showtag {tag isnew} {
     global ctext cached_tagcontent tagids linknum tagobjid
 
     if {$isnew} {
-	addtohistory [list showtag $tag 0] savectextpos
+        addtohistory [list showtag $tag 0] savectextpos
     }
     $ctext conf -state normal
     clear_ctext
@@ -11338,7 +11356,7 @@ proc showtags {id isnew} {
     global idtags ctext linknum
 
     if {$isnew} {
-	addtohistory [list showtags $id 0] savectextpos
+        addtohistory [list showtags $id 0] savectextpos
     }
     $ctext conf -state normal
     clear_ctext
@@ -11346,9 +11364,9 @@ proc showtags {id isnew} {
     set linknum 0
     set sep {}
     foreach tag $idtags($id) {
-	$ctext insert end $sep
-	add_tag_ctext $tag
-	set sep "\n\n"
+        $ctext insert end $sep
+        add_tag_ctext $tag
+        set sep "\n\n"
     }
     maybe_scroll_ctext 1
     $ctext conf -state disabled
@@ -11364,7 +11382,7 @@ proc doquit {} {
     destroy .
 
     if {[info exists gitktmpdir]} {
-	catch {file delete -force $gitktmpdir}
+        catch {file delete -force $gitktmpdir}
     }
 }
 
@@ -11373,9 +11391,9 @@ proc mkfontdisp {font top which} {
 
     set fontpref($font) [set $font]
     ${NS}::button $top.${font}but -text $which \
-	-command [list choosefont $font $which]
+        -command [list choosefont $font $which]
     ${NS}::label $top.$font -relief flat -font $font \
-	-text $fontattr($font,family) -justify left
+        -text $fontattr($font,family) -justify left
     grid x $top.${font}but $top.$font -sticky w
 }
 
@@ -11392,58 +11410,58 @@ proc choosefont {font which} {
     set top .gitkfont
     set fonttop $top
     if {![winfo exists $top]} {
-	font create sample
-	eval font config sample [font actual $font]
-	ttk_toplevel $top
-	make_transient $top $prefstop
-	wm title $top [mc "Gitk font chooser"]
-	${NS}::label $top.l -textvariable fontparam(which)
-	pack $top.l -side top
-	set fontlist [lsort [font families]]
-	${NS}::frame $top.f
-	listbox $top.f.fam -listvariable fontlist \
-	    -yscrollcommand [list $top.f.sb set]
-	bind $top.f.fam <<ListboxSelect>> selfontfam
-	${NS}::scrollbar $top.f.sb -command [list $top.f.fam yview]
-	pack $top.f.sb -side right -fill y
-	pack $top.f.fam -side left -fill both -expand 1
-	pack $top.f -side top -fill both -expand 1
-	${NS}::frame $top.g
-	spinbox $top.g.size -from 4 -to 40 -width 4 \
-	    -textvariable fontparam(size) \
-	    -validatecommand {string is integer -strict %s}
-	checkbutton $top.g.bold -padx 5 \
-	    -font {{Times New Roman} 12 bold} -text [mc "B"] -indicatoron 0 \
-	    -variable fontparam(weight) -onvalue bold -offvalue normal
-	checkbutton $top.g.ital -padx 5 \
-	    -font {{Times New Roman} 12 italic} -text [mc "I"] -indicatoron 0  \
-	    -variable fontparam(slant) -onvalue italic -offvalue roman
-	pack $top.g.size $top.g.bold $top.g.ital -side left
-	pack $top.g -side top
-	canvas $top.c -width 150 -height 50 -border 2 -relief sunk \
-	    -background white
-	$top.c create text 100 25 -anchor center -text $which -font sample \
-	    -fill black -tags text
-	bind $top.c <Configure> [list centertext $top.c]
-	pack $top.c -side top -fill x
-	${NS}::frame $top.buts
-	${NS}::button $top.buts.ok -text [mc "OK"] -command fontok -default active
-	${NS}::button $top.buts.can -text [mc "Cancel"] -command fontcan -default normal
-	bind $top <Key-Return> fontok
-	bind $top <Key-Escape> fontcan
-	grid $top.buts.ok $top.buts.can
-	grid columnconfigure $top.buts 0 -weight 1 -uniform a
-	grid columnconfigure $top.buts 1 -weight 1 -uniform a
-	pack $top.buts -side bottom -fill x
-	trace add variable fontparam write chg_fontparam
+        font create sample
+        eval font config sample [font actual $font]
+        ttk_toplevel $top
+        make_transient $top $prefstop
+        wm title $top [mc "Gitk font chooser"]
+        ${NS}::label $top.l -textvariable fontparam(which)
+        pack $top.l -side top
+        set fontlist [lsort [font families]]
+        ${NS}::frame $top.f
+        listbox $top.f.fam -listvariable fontlist \
+            -yscrollcommand [list $top.f.sb set]
+        bind $top.f.fam <<ListboxSelect>> selfontfam
+        ${NS}::scrollbar $top.f.sb -command [list $top.f.fam yview]
+        pack $top.f.sb -side right -fill y
+        pack $top.f.fam -side left -fill both -expand 1
+        pack $top.f -side top -fill both -expand 1
+        ${NS}::frame $top.g
+        spinbox $top.g.size -from 4 -to 40 -width 4 \
+            -textvariable fontparam(size) \
+            -validatecommand {string is integer -strict %s}
+        checkbutton $top.g.bold -padx 5 \
+            -font {{Times New Roman} 12 bold} -text [mc "B"] -indicatoron 0 \
+            -variable fontparam(weight) -onvalue bold -offvalue normal
+        checkbutton $top.g.ital -padx 5 \
+            -font {{Times New Roman} 12 italic} -text [mc "I"] -indicatoron 0  \
+            -variable fontparam(slant) -onvalue italic -offvalue roman
+        pack $top.g.size $top.g.bold $top.g.ital -side left
+        pack $top.g -side top
+        canvas $top.c -width 150 -height 50 -border 2 -relief sunk \
+            -background white
+        $top.c create text 100 25 -anchor center -text $which -font sample \
+            -fill black -tags text
+        bind $top.c <Configure> [list centertext $top.c]
+        pack $top.c -side top -fill x
+        ${NS}::frame $top.buts
+        ${NS}::button $top.buts.ok -text [mc "OK"] -command fontok -default active
+        ${NS}::button $top.buts.can -text [mc "Cancel"] -command fontcan -default normal
+        bind $top <Key-Return> fontok
+        bind $top <Key-Escape> fontcan
+        grid $top.buts.ok $top.buts.can
+        grid columnconfigure $top.buts 0 -weight 1 -uniform a
+        grid columnconfigure $top.buts 1 -weight 1 -uniform a
+        pack $top.buts -side bottom -fill x
+        trace add variable fontparam write chg_fontparam
     } else {
-	raise $top
-	$top.c itemconf text -text $which
+        raise $top
+        $top.c itemconf text -text $which
     }
     set i [lsearch -exact $fontlist $fontparam(family)]
     if {$i >= 0} {
-	$top.f.fam selection set $i
-	$top.f.fam see $i
+        $top.f.fam selection set $i
+        $top.f.fam see $i
     }
 }
 
@@ -11457,10 +11475,10 @@ proc fontok {} {
     set f $fontparam(font)
     set fontpref($f) [list $fontparam(family) $fontparam(size)]
     if {$fontparam(weight) eq "bold"} {
-	lappend fontpref($f) "bold"
+        lappend fontpref($f) "bold"
     }
     if {$fontparam(slant) eq "italic"} {
-	lappend fontpref($f) "italic"
+        lappend fontpref($f) "italic"
     }
     set w $prefstop.notebook.fonts.$f
     $w conf -text $fontparam(family) -font $fontpref($f)
@@ -11472,10 +11490,10 @@ proc fontcan {} {
     global fonttop fontparam
 
     if {[info exists fonttop]} {
-	catch {destroy $fonttop}
-	catch {font delete sample}
-	unset fonttop
-	unset fontparam
+        catch {destroy $fonttop}
+        catch {font delete sample}
+        unset fonttop
+        unset fontparam
     }
 }
 
@@ -11483,21 +11501,21 @@ if {[package vsatisfies [package provide Tk] 8.6]} {
     # In Tk 8.6 we have a native font chooser dialog. Overwrite the above
     # function to make use of it.
     proc choosefont {font which} {
-	tk fontchooser configure -title $which -font $font \
-	    -command [list on_choosefont $font $which]
-	tk fontchooser show
+        tk fontchooser configure -title $which -font $font \
+            -command [list on_choosefont $font $which]
+        tk fontchooser show
     }
     proc on_choosefont {font which newfont} {
-	global fontparam
-	puts stderr "$font $newfont"
-	array set f [font actual $newfont]
-	set fontparam(which) $which
-	set fontparam(font) $font
-	set fontparam(family) $f(-family)
-	set fontparam(size) $f(-size)
-	set fontparam(weight) $f(-weight)
-	set fontparam(slant) $f(-slant)
-	fontok
+        global fontparam
+        puts stderr "$font $newfont"
+        array set f [font actual $newfont]
+        set fontparam(which) $which
+        set fontparam(font) $font
+        set fontparam(family) $f(-family)
+        set fontparam(size) $f(-size)
+        set fontparam(weight) $f(-weight)
+        set fontparam(slant) $f(-slant)
+        fontok
     }
 }
 
@@ -11506,7 +11524,7 @@ proc selfontfam {} {
 
     set i [$fonttop.f.fam curselection]
     if {$i ne {}} {
-	set fontparam(family) [$fonttop.f.fam get $i]
+        set fontparam(family) [$fonttop.f.fam get $i]
     }
 }
 
@@ -11521,9 +11539,9 @@ proc create_prefs_page {w} {
     global NS
     set parent [join [lrange [split $w .] 0 end-1] .]
     if {[winfo class $parent] eq "TNotebook"} {
-	${NS}::frame $w
+        ${NS}::frame $w
     } else {
-	${NS}::labelframe $w
+        ${NS}::labelframe $w
     }
 }
 
@@ -11545,14 +11563,14 @@ proc prefspage_general {notebook} {
     spinbox $page.maxpct -from 1 -to 100 -width 4 -textvariable maxgraphpct
     grid x $page.maxpctl $page.maxpct -sticky w
     ${NS}::checkbutton $page.showlocal -text [mc "Show local changes"] \
-	-variable showlocalchanges
+        -variable showlocalchanges
     grid x $page.showlocal -sticky w
     ${NS}::checkbutton $page.autoselect -text [mc "Auto-select SHA1 (length)"] \
-	-variable autoselect
+        -variable autoselect
     spinbox $page.autosellen -from 1 -to 40 -width 4 -textvariable autosellen
     grid x $page.autoselect $page.autosellen -sticky w
     ${NS}::checkbutton $page.hideremotes -text [mc "Hide remote refs"] \
-	-variable hideremotes
+        -variable hideremotes
     grid x $page.hideremotes -sticky w
 
     ${NS}::label $page.ddisp -text [mc "Diff display options"]
@@ -11561,16 +11579,16 @@ proc prefspage_general {notebook} {
     spinbox $page.tabstop -from 1 -to 20 -width 4 -textvariable tabstop
     grid x $page.tabstopl $page.tabstop -sticky w
     ${NS}::checkbutton $page.ntag -text [mc "Display nearby tags/heads"] \
-	-variable showneartags
+        -variable showneartags
     grid x $page.ntag -sticky w
     ${NS}::label $page.maxrefsl -text [mc "Maximum # tags/heads to show"]
     spinbox $page.maxrefs -from 1 -to 1000 -width 4 -textvariable maxrefs
     grid x $page.maxrefsl $page.maxrefs -sticky w
     ${NS}::checkbutton $page.ldiff -text [mc "Limit diffs to listed paths"] \
-	-variable limitdiffs
+        -variable limitdiffs
     grid x $page.ldiff -sticky w
     ${NS}::checkbutton $page.lattr -text [mc "Support per-file encodings"] \
-	-variable perfile_attrs
+        -variable perfile_attrs
     grid x $page.lattr -sticky w
 
     ${NS}::entry $page.extdifft -textvariable extdifftool
@@ -11591,11 +11609,11 @@ proc prefspage_general {notebook} {
     ${NS}::label $page.lgen -text [mc "General options"]
     grid $page.lgen - -sticky w -pady 10
     ${NS}::checkbutton $page.want_ttk -variable want_ttk \
-	-text [mc "Use themed widgets"]
+        -text [mc "Use themed widgets"]
     if {$have_ttk} {
-	${NS}::label $page.ttk_note -text [mc "(change requires restart)"]
+        ${NS}::label $page.ttk_note -text [mc "(change requires restart)"]
     } else {
-	${NS}::label $page.ttk_note -text [mc "(currently unavailable)"]
+        ${NS}::label $page.ttk_note -text [mc "(currently unavailable)"]
     }
     grid x $page.want_ttk $page.ttk_note -sticky w
     return $page
@@ -11603,6 +11621,7 @@ proc prefspage_general {notebook} {
 
 proc prefspage_colors {notebook} {
     global NS uicolor bgcolor fgcolor ctext diffcolors selectbgcolor markbgcolor
+    global diffbgcolors
 
     set page [create_prefs_page $notebook.colors]
 
@@ -11614,37 +11633,49 @@ proc prefspage_colors {notebook} {
     grid x $page.uibut $page.ui -sticky w
     label $page.bg -padx 40 -relief sunk -background $bgcolor
     ${NS}::button $page.bgbut -text [mc "Background"] \
-	-command [list choosecolor bgcolor {} $page.bg [mc "background"] setbg]
+        -command [list choosecolor bgcolor {} $page.bg [mc "background"] setbg]
     grid x $page.bgbut $page.bg -sticky w
     label $page.fg -padx 40 -relief sunk -background $fgcolor
     ${NS}::button $page.fgbut -text [mc "Foreground"] \
-	-command [list choosecolor fgcolor {} $page.fg [mc "foreground"] setfg]
+        -command [list choosecolor fgcolor {} $page.fg [mc "foreground"] setfg]
     grid x $page.fgbut $page.fg -sticky w
     label $page.diffold -padx 40 -relief sunk -background [lindex $diffcolors 0]
     ${NS}::button $page.diffoldbut -text [mc "Diff: old lines"] \
-	-command [list choosecolor diffcolors 0 $page.diffold [mc "diff old lines"] \
-		      [list $ctext tag conf d0 -foreground]]
+        -command [list choosecolor diffcolors 0 $page.diffold [mc "diff old lines"] \
+                      [list $ctext tag conf d0 -foreground]]
     grid x $page.diffoldbut $page.diffold -sticky w
+    label $page.diffoldbg -padx 40 -relief sunk -background [lindex $diffbgcolors 0]
+    ${NS}::button $page.diffoldbgbut -text [mc "Diff: old lines bg"] \
+        -command [list choosecolor diffbgcolors 0 $page.diffoldbg \
+                      [mc "diff old lines bg"] \
+                      [list $ctext tag conf d0 -background]]
+    grid x $page.diffoldbgbut $page.diffoldbg -sticky w
     label $page.diffnew -padx 40 -relief sunk -background [lindex $diffcolors 1]
     ${NS}::button $page.diffnewbut -text [mc "Diff: new lines"] \
-	-command [list choosecolor diffcolors 1 $page.diffnew [mc "diff new lines"] \
-		      [list $ctext tag conf dresult -foreground]]
+        -command [list choosecolor diffcolors 1 $page.diffnew [mc "diff new lines"] \
+                      [list $ctext tag conf dresult -foreground]]
     grid x $page.diffnewbut $page.diffnew -sticky w
+    label $page.diffnewbg -padx 40 -relief sunk -background [lindex $diffbgcolors 1]
+    ${NS}::button $page.diffnewbgbut -text [mc "Diff: new lines bg"] \
+        -command [list choosecolor diffbgcolors 1 $page.diffnewbg \
+                      [mc "diff new lines bg"] \
+                      [list $ctext tag conf dresult -background]]
+    grid x $page.diffnewbgbut $page.diffnewbg -sticky w
     label $page.hunksep -padx 40 -relief sunk -background [lindex $diffcolors 2]
     ${NS}::button $page.hunksepbut -text [mc "Diff: hunk header"] \
-	-command [list choosecolor diffcolors 2 $page.hunksep \
-		      [mc "diff hunk header"] \
-		      [list $ctext tag conf hunksep -foreground]]
+        -command [list choosecolor diffcolors 2 $page.hunksep \
+                      [mc "diff hunk header"] \
+                      [list $ctext tag conf hunksep -foreground]]
     grid x $page.hunksepbut $page.hunksep -sticky w
     label $page.markbgsep -padx 40 -relief sunk -background $markbgcolor
     ${NS}::button $page.markbgbut -text [mc "Marked line bg"] \
-	-command [list choosecolor markbgcolor {} $page.markbgsep \
-		      [mc "marked line background"] \
-		      [list $ctext tag conf omark -background]]
+        -command [list choosecolor markbgcolor {} $page.markbgsep \
+                      [mc "marked line background"] \
+                      [list $ctext tag conf omark -background]]
     grid x $page.markbgbut $page.markbgsep -sticky w
     label $page.selbgsep -padx 40 -relief sunk -background $selectbgcolor
     ${NS}::button $page.selbgbut -text [mc "Select bg"] \
-	-command [list choosecolor selectbgcolor {} $page.selbgsep [mc "background"] setselbg]
+        -command [list choosecolor selectbgcolor {} $page.selbgsep [mc "background"] setselbg]
     grid x $page.selbgbut $page.selbgsep -sticky w
     return $page
 }
@@ -11670,21 +11701,21 @@ proc doprefs {} {
     set top .gitkprefs
     set prefstop $top
     if {[winfo exists $top]} {
-	raise $top
-	return
+        raise $top
+        return
     }
     foreach v {maxwidth maxgraphpct showneartags showlocalchanges \
-		   limitdiffs tabstop perfile_attrs hideremotes want_ttk} {
-	set oldprefs($v) [set $v]
+                   limitdiffs tabstop perfile_attrs hideremotes want_ttk} {
+        set oldprefs($v) [set $v]
     }
     ttk_toplevel $top
     wm title $top [mc "Gitk preferences"]
     make_transient $top .
 
     if {[set use_notebook [expr {$use_ttk && [info command ::ttk::notebook] ne ""}]]} {
-	set notebook [ttk::notebook $top.notebook]
+        set notebook [ttk::notebook $top.notebook]
     } else {
-	set notebook [${NS}::frame $top.notebook -borderwidth 0 -relief flat]
+        set notebook [${NS}::frame $top.notebook -borderwidth 0 -relief flat]
     }
 
     lappend pages [prefspage_general $notebook] [mc "General"]
@@ -11692,21 +11723,21 @@ proc doprefs {} {
     lappend pages [prefspage_fonts $notebook] [mc "Fonts"]
     set col 0
     foreach {page title} $pages {
-	if {$use_notebook} {
-	    $notebook add $page -text $title
-	} else {
-	    set btn [${NS}::button $notebook.b_[string map {. X} $page] \
-			 -text $title -command [list raise $page]]
-	    $page configure -text $title
-	    grid $btn -row 0 -column [incr col] -sticky w
-	    grid $page -row 1 -column 0 -sticky news -columnspan 100
-	}
+        if {$use_notebook} {
+            $notebook add $page -text $title
+        } else {
+            set btn [${NS}::button $notebook.b_[string map {. X} $page] \
+                         -text $title -command [list raise $page]]
+            $page configure -text $title
+            grid $btn -row 0 -column [incr col] -sticky w
+            grid $page -row 1 -column 0 -sticky news -columnspan 100
+        }
     }
 
     if {!$use_notebook} {
-	grid columnconfigure $notebook 0 -weight 1
-	grid rowconfigure $notebook 1 -weight 1
-	raise [lindex $pages 0]
+        grid columnconfigure $notebook 0 -weight 1
+        grid rowconfigure $notebook 1 -weight 1
+        raise [lindex $pages 0]
     }
 
     grid $notebook -sticky news -padx 2 -pady 2
@@ -11731,7 +11762,7 @@ proc choose_extdiff {} {
 
     set prog [tk_getOpenFile -title [mc "External diff tool"] -multiple false]
     if {$prog ne {}} {
-	set extdifftool $prog
+        set extdifftool $prog
     }
 }
 
@@ -11739,7 +11770,7 @@ proc choosecolor {v vi w x cmd} {
     global $v
 
     set c [tk_chooseColor -initialcolor [lindex [set $v] $vi] \
-	       -title [mc "Gitk: choose color for %s" $x]]
+               -title [mc "Gitk: choose color for %s" $x]]
     if {$c eq {}} return
     $w conf -background $c
     lset $v $vi $c
@@ -11749,12 +11780,12 @@ proc choosecolor {v vi w x cmd} {
 proc setselbg {c} {
     global bglist cflist
     foreach w $bglist {
-	if {[winfo exists $w]} {
-	    $w configure -selectbackground $c
-	}
+        if {[winfo exists $w]} {
+            $w configure -selectbackground $c
+        }
     }
     $cflist tag configure highlight \
-	-background [$cflist cget -selectbackground]
+        -background [$cflist cget -selectbackground]
     allcanvs itemconf secsel -fill $c
 }
 
@@ -11768,7 +11799,7 @@ proc setui {c} {
     set bg [winfo rgb . $c]
     set selc black
     if {[lindex $bg 0] + 1.5 * [lindex $bg 1] + 0.5 * [lindex $bg 2] > 100000} {
-	set selc white
+        set selc white
     }
     tk_setPalette background $c selectColor $selc
 }
@@ -11777,9 +11808,9 @@ proc setbg {c} {
     global bglist
 
     foreach w $bglist {
-	if {[winfo exists $w]} {
-	    $w conf -background $c
-	}
+        if {[winfo exists $w]} {
+            $w conf -background $c
+        }
     }
 }
 
@@ -11787,9 +11818,9 @@ proc setfg {c} {
     global fglist canv
 
     foreach w $fglist {
-	if {[winfo exists $w]} {
-	    $w conf -foreground $c
-	}
+        if {[winfo exists $w]} {
+            $w conf -foreground $c
+        }
     }
     allcanvs itemconf text -fill $c
     $canv itemconf circle -outline $c
@@ -11800,9 +11831,9 @@ proc prefscan {} {
     global oldprefs prefstop
 
     foreach v {maxwidth maxgraphpct showneartags showlocalchanges \
-		   limitdiffs tabstop perfile_attrs hideremotes want_ttk} {
-	global $v
-	set $v $oldprefs($v)
+                   limitdiffs tabstop perfile_attrs hideremotes want_ttk} {
+        global $v
+        set $v $oldprefs($v)
     }
     catch {destroy $prefstop}
     unset prefstop
@@ -11821,76 +11852,76 @@ proc prefsok {} {
     fontcan
     set fontchanged 0
     if {$mainfont ne $fontpref(mainfont)} {
-	set mainfont $fontpref(mainfont)
-	parsefont mainfont $mainfont
-	eval font configure mainfont [fontflags mainfont]
-	eval font configure mainfontbold [fontflags mainfont 1]
-	setcoords
-	set fontchanged 1
+        set mainfont $fontpref(mainfont)
+        parsefont mainfont $mainfont
+        eval font configure mainfont [fontflags mainfont]
+        eval font configure mainfontbold [fontflags mainfont 1]
+        setcoords
+        set fontchanged 1
     }
     if {$textfont ne $fontpref(textfont)} {
-	set textfont $fontpref(textfont)
-	parsefont textfont $textfont
-	eval font configure textfont [fontflags textfont]
-	eval font configure textfontbold [fontflags textfont 1]
+        set textfont $fontpref(textfont)
+        parsefont textfont $textfont
+        eval font configure textfont [fontflags textfont]
+        eval font configure textfontbold [fontflags textfont 1]
     }
     if {$uifont ne $fontpref(uifont)} {
-	set uifont $fontpref(uifont)
-	parsefont uifont $uifont
-	eval font configure uifont [fontflags uifont]
+        set uifont $fontpref(uifont)
+        parsefont uifont $uifont
+        eval font configure uifont [fontflags uifont]
     }
     settabs
     if {$showlocalchanges != $oldprefs(showlocalchanges)} {
-	if {$showlocalchanges} {
-	    doshowlocalchanges
-	} else {
-	    dohidelocalchanges
-	}
+        if {$showlocalchanges} {
+            doshowlocalchanges
+        } else {
+            dohidelocalchanges
+        }
     }
     if {$limitdiffs != $oldprefs(limitdiffs) ||
-	($perfile_attrs && !$oldprefs(perfile_attrs))} {
-	# treediffs elements are limited by path;
-	# won't have encodings cached if perfile_attrs was just turned on
-	unset -nocomplain treediffs
+        ($perfile_attrs && !$oldprefs(perfile_attrs))} {
+        # treediffs elements are limited by path;
+        # won't have encodings cached if perfile_attrs was just turned on
+        unset -nocomplain treediffs
     }
     if {$fontchanged || $maxwidth != $oldprefs(maxwidth)
-	|| $maxgraphpct != $oldprefs(maxgraphpct)} {
-	redisplay
+        || $maxgraphpct != $oldprefs(maxgraphpct)} {
+        redisplay
     } elseif {$showneartags != $oldprefs(showneartags) ||
-	  $limitdiffs != $oldprefs(limitdiffs)} {
-	reselectline
+          $limitdiffs != $oldprefs(limitdiffs)} {
+        reselectline
     }
     if {$hideremotes != $oldprefs(hideremotes)} {
-	rereadrefs
+        rereadrefs
     }
 }
 
 proc formatdate {d} {
     global datetimeformat
     if {$d ne {}} {
-	# If $datetimeformat includes a timezone, display in the
-	# timezone of the argument.  Otherwise, display in local time.
-	if {[string match {*%[zZ]*} $datetimeformat]} {
-	    if {[catch {set d [clock format [lindex $d 0] -timezone [lindex $d 1] -format $datetimeformat]}]} {
-		# Tcl < 8.5 does not support -timezone.  Emulate it by
-		# setting TZ (e.g. TZ=<-0430>+04:30).
-		global env
-		if {[info exists env(TZ)]} {
-		    set savedTZ $env(TZ)
-		}
-		set zone [lindex $d 1]
-		set sign [string map {+ - - +} [string index $zone 0]]
-		set env(TZ) <$zone>$sign[string range $zone 1 2]:[string range $zone 3 4]
-		set d [clock format [lindex $d 0] -format $datetimeformat]
-		if {[info exists savedTZ]} {
-		    set env(TZ) $savedTZ
-		} else {
-		    unset env(TZ)
-		}
-	    }
-	} else {
-	    set d [clock format [lindex $d 0] -format $datetimeformat]
-	}
+        # If $datetimeformat includes a timezone, display in the
+        # timezone of the argument.  Otherwise, display in local time.
+        if {[string match {*%[zZ]*} $datetimeformat]} {
+            if {[catch {set d [clock format [lindex $d 0] -timezone [lindex $d 1] -format $datetimeformat]}]} {
+                # Tcl < 8.5 does not support -timezone.  Emulate it by
+                # setting TZ (e.g. TZ=<-0430>+04:30).
+                global env
+                if {[info exists env(TZ)]} {
+                    set savedTZ $env(TZ)
+                }
+                set zone [lindex $d 1]
+                set sign [string map {+ - - +} [string index $zone 0]]
+                set env(TZ) <$zone>$sign[string range $zone 1 2]:[string range $zone 3 4]
+                set d [clock format [lindex $d 0] -format $datetimeformat]
+                if {[info exists savedTZ]} {
+                    set env(TZ) $savedTZ
+                } else {
+                    unset env(TZ)
+                }
+            }
+        } else {
+            set d [clock format [lindex $d 0] -format $datetimeformat]
+        }
     }
     return $d
 }
@@ -12136,38 +12167,38 @@ set encoding_aliases {
 proc tcl_encoding {enc} {
     global encoding_aliases tcl_encoding_cache
     if {[info exists tcl_encoding_cache($enc)]} {
-	return $tcl_encoding_cache($enc)
+        return $tcl_encoding_cache($enc)
     }
     set names [encoding names]
     set lcnames [string tolower $names]
     set enc [string tolower $enc]
     set i [lsearch -exact $lcnames $enc]
     if {$i < 0} {
-	# look for "isonnn" instead of "iso-nnn" or "iso_nnn"
-	if {[regsub {^(iso|cp|ibm|jis)[-_]} $enc {\1} encx]} {
-	    set i [lsearch -exact $lcnames $encx]
-	}
+        # look for "isonnn" instead of "iso-nnn" or "iso_nnn"
+        if {[regsub {^(iso|cp|ibm|jis)[-_]} $enc {\1} encx]} {
+            set i [lsearch -exact $lcnames $encx]
+        }
     }
     if {$i < 0} {
-	foreach l $encoding_aliases {
-	    set ll [string tolower $l]
-	    if {[lsearch -exact $ll $enc] < 0} continue
-	    # look through the aliases for one that tcl knows about
-	    foreach e $ll {
-		set i [lsearch -exact $lcnames $e]
-		if {$i < 0} {
-		    if {[regsub {^(iso|cp|ibm|jis)[-_]} $e {\1} ex]} {
-			set i [lsearch -exact $lcnames $ex]
-		    }
-		}
-		if {$i >= 0} break
-	    }
-	    break
-	}
+        foreach l $encoding_aliases {
+            set ll [string tolower $l]
+            if {[lsearch -exact $ll $enc] < 0} continue
+            # look through the aliases for one that tcl knows about
+            foreach e $ll {
+                set i [lsearch -exact $lcnames $e]
+                if {$i < 0} {
+                    if {[regsub {^(iso|cp|ibm|jis)[-_]} $e {\1} ex]} {
+                        set i [lsearch -exact $lcnames $ex]
+                    }
+                }
+                if {$i >= 0} break
+            }
+            break
+        }
     }
     set tclenc {}
     if {$i >= 0} {
-	set tclenc [lindex $names $i]
+        set tclenc [lindex $names $i]
     }
     set tcl_encoding_cache($enc) $tclenc
     return $tclenc
@@ -12176,16 +12207,16 @@ proc tcl_encoding {enc} {
 proc gitattr {path attr default} {
     global path_attr_cache
     if {[info exists path_attr_cache($attr,$path)]} {
-	set r $path_attr_cache($attr,$path)
+        set r $path_attr_cache($attr,$path)
     } else {
-	set r "unspecified"
-	if {![catch {set line [exec git check-attr $attr -- $path]}]} {
-	    regexp "(.*): $attr: (.*)" $line m f r
-	}
-	set path_attr_cache($attr,$path) $r
+        set r "unspecified"
+        if {![catch {set line [exec git check-attr $attr -- $path]}]} {
+            regexp "(.*): $attr: (.*)" $line m f r
+        }
+        set path_attr_cache($attr,$path) $r
     }
     if {$r eq "unspecified"} {
-	return $default
+        return $default
     }
     return $r
 }
@@ -12194,28 +12225,28 @@ proc cache_gitattr {attr pathlist} {
     global path_attr_cache
     set newlist {}
     foreach path $pathlist {
-	if {![info exists path_attr_cache($attr,$path)]} {
-	    lappend newlist $path
-	}
+        if {![info exists path_attr_cache($attr,$path)]} {
+            lappend newlist $path
+        }
     }
     set lim 1000
     if {[tk windowingsystem] == "win32"} {
-	# windows has a 32k limit on the arguments to a command...
-	set lim 30
+        # windows has a 32k limit on the arguments to a command...
+        set lim 30
     }
     while {$newlist ne {}} {
-	set head [lrange $newlist 0 [expr {$lim - 1}]]
-	set newlist [lrange $newlist $lim end]
-	if {![catch {set rlist [eval exec git check-attr $attr -- $head]}]} {
-	    foreach row [split $rlist "\n"] {
-		if {[regexp "(.*): $attr: (.*)" $row m path value]} {
-		    if {[string index $path 0] eq "\""} {
-			set path [encoding convertfrom [lindex $path 0]]
-		    }
-		    set path_attr_cache($attr,$path) $value
-		}
-	    }
-	}
+        set head [lrange $newlist 0 [expr {$lim - 1}]]
+        set newlist [lrange $newlist $lim end]
+        if {![catch {set rlist [eval exec git check-attr $attr -- $head]}]} {
+            foreach row [split $rlist "\n"] {
+                if {[regexp "(.*): $attr: (.*)" $row m path value]} {
+                    if {[string index $path 0] eq "\""} {
+                        set path [encoding convertfrom [lindex $path 0]]
+                    }
+                    set path_attr_cache($attr,$path) $value
+                }
+            }
+        }
     }
 }
 
@@ -12223,10 +12254,10 @@ proc get_path_encoding {path} {
     global gui_encoding perfile_attrs
     set tcl_enc $gui_encoding
     if {$path ne {} && $perfile_attrs} {
-	set enc2 [tcl_encoding [gitattr $path encoding $tcl_enc]]
-	if {$enc2 ne {}} {
-	    set tcl_enc $enc2
-	}
+        set enc2 [tcl_encoding [gitattr $path encoding $tcl_enc]]
+        if {$enc2 ne {}} {
+            set tcl_enc $enc2
+        }
     }
     return $tcl_enc
 }
@@ -12253,7 +12284,7 @@ namespace import ::msgcat::mc
 # First check that Tcl/Tk is recent enough
 if {[catch {package require Tk 8.4} err]} {
     show_error {} . [mc "Sorry, gitk cannot run with this version of Tcl/Tk.\n\
-			 Gitk requires at least Tcl/Tk 8.4."]
+                         Gitk requires at least Tcl/Tk 8.4."]
     exit 1
 }
 
@@ -12293,12 +12324,12 @@ set gui_encoding [encoding system]
 catch {
     set enc [exec git config --get gui.encoding]
     if {$enc ne {}} {
-	set tclenc [tcl_encoding $enc]
-	if {$tclenc ne {}} {
-	    set gui_encoding $tclenc
-	} else {
-	    puts stderr "Warning: encoding $enc is not supported by Tcl/Tk"
-	}
+        set tclenc [tcl_encoding $enc]
+        if {$tclenc ne {}} {
+            set gui_encoding $tclenc
+        } else {
+            puts stderr "Warning: encoding $enc is not supported by Tcl/Tk"
+        }
     }
 }
 
@@ -12368,12 +12399,13 @@ if {[tk windowingsystem] eq "win32"} {
     set fgcolor black
     set selectbgcolor gray85
     if {[tk windowingsystem] eq "aqua"} {
-	set web_browser "open"
+        set web_browser "open"
     } else {
-	set web_browser "xdg-open"
+        set web_browser "xdg-open"
     }
 }
-set diffcolors {red "#00a000" blue}
+set diffcolors {"#c30000" "#009800" blue}
+set diffbgcolors {"#fff3f3" "#f0fff0"}
 set diffcontext 3
 set mergecolors {red blue "#00ff00" purple brown "#009090" magenta "#808000" "#009000" "#ff0080" cyan "#b07070" "#70b0f0" "#70f0b0" "#f0b070" "#ff70b0"}
 set ignorespace 0
@@ -12413,22 +12445,22 @@ catch {
     # follow the XDG base directory specification by default. See
     # http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
     if {[info exists env(XDG_CONFIG_HOME)] && $env(XDG_CONFIG_HOME) ne ""} {
-	# XDG_CONFIG_HOME environment variable is set
-	set config_file [file join $env(XDG_CONFIG_HOME) git gitk]
-	set config_file_tmp [file join $env(XDG_CONFIG_HOME) git gitk-tmp]
+        # XDG_CONFIG_HOME environment variable is set
+        set config_file [file join $env(XDG_CONFIG_HOME) git gitk]
+        set config_file_tmp [file join $env(XDG_CONFIG_HOME) git gitk-tmp]
     } else {
-	# default XDG_CONFIG_HOME
-	set config_file "~/.config/git/gitk"
-	set config_file_tmp "~/.config/git/gitk-tmp"
+        # default XDG_CONFIG_HOME
+        set config_file "~/.config/git/gitk"
+        set config_file_tmp "~/.config/git/gitk-tmp"
     }
     if {![file exists $config_file]} {
-	# for backward compatibility use the old config file if it exists
-	if {[file exists "~/.gitk"]} {
-	    set config_file "~/.gitk"
-	    set config_file_tmp "~/.gitk-tmp"
-	} elseif {![file exists [file dirname $config_file]]} {
-	    file mkdir [file dirname $config_file]
-	}
+        # for backward compatibility use the old config file if it exists
+        if {[file exists "~/.gitk"]} {
+            set config_file "~/.gitk"
+            set config_file_tmp "~/.gitk-tmp"
+        } elseif {![file exists [file dirname $config_file]]} {
+            file mkdir [file dirname $config_file]
+        }
     }
     source $config_file
 }
@@ -12444,7 +12476,7 @@ set config_variables {
     remotebgcolor tagbgcolor tagfgcolor tagoutlinecolor reflinecolor
     filesepbgcolor filesepfgcolor linehoverbgcolor linehoverfgcolor
     linehoveroutlinecolor mainheadcirclecolor workingfilescirclecolor
-    indexcirclecolor circlecolors linkfgcolor circleoutlinecolor
+    indexcirclecolor circlecolors linkfgcolor circleoutlinecolor diffbgcolors
     web_browser
 }
 foreach var $config_variables {
@@ -12482,20 +12514,20 @@ set i 0
 set revtreeargscmd {}
 foreach arg $argv {
     switch -glob -- $arg {
-	"" { }
-	"--" {
-	    set cmdline_files [lrange $argv [expr {$i + 1}] end]
-	    break
-	}
-	"--select-commit=*" {
-	    set selecthead [string range $arg 16 end]
-	}
-	"--argscmd=*" {
-	    set revtreeargscmd [string range $arg 10 end]
-	}
-	default {
-	    lappend revtreeargs $arg
-	}
+        "" { }
+        "--" {
+            set cmdline_files [lrange $argv [expr {$i + 1}] end]
+            break
+        }
+        "--select-commit=*" {
+            set selecthead [string range $arg 16 end]
+        }
+        "--argscmd=*" {
+            set revtreeargscmd [string range $arg 10 end]
+        }
+        default {
+            lappend revtreeargs $arg
+        }
     }
     incr i
 }
@@ -12507,29 +12539,29 @@ if {$selecthead eq "HEAD"} {
 if {$i >= [llength $argv] && $revtreeargs ne {}} {
     # no -- on command line, but some arguments (other than --argscmd)
     if {[catch {
-	set f [eval exec git rev-parse --no-revs --no-flags $revtreeargs]
-	set cmdline_files [split $f "\n"]
-	set n [llength $cmdline_files]
-	set revtreeargs [lrange $revtreeargs 0 end-$n]
-	# Unfortunately git rev-parse doesn't produce an error when
-	# something is both a revision and a filename.  To be consistent
-	# with git log and git rev-list, check revtreeargs for filenames.
-	foreach arg $revtreeargs {
-	    if {[file exists $arg]} {
-		show_error {} . [mc "Ambiguous argument '%s': both revision\
-				 and filename" $arg]
-		exit 1
-	    }
-	}
+        set f [eval exec git rev-parse --no-revs --no-flags $revtreeargs]
+        set cmdline_files [split $f "\n"]
+        set n [llength $cmdline_files]
+        set revtreeargs [lrange $revtreeargs 0 end-$n]
+        # Unfortunately git rev-parse doesn't produce an error when
+        # something is both a revision and a filename.  To be consistent
+        # with git log and git rev-list, check revtreeargs for filenames.
+        foreach arg $revtreeargs {
+            if {[file exists $arg]} {
+                show_error {} . [mc "Ambiguous argument '%s': both revision\
+                                 and filename" $arg]
+                exit 1
+            }
+        }
     } err]} {
-	# unfortunately we get both stdout and stderr in $err,
-	# so look for "fatal:".
-	set i [string first "fatal:" $err]
-	if {$i > 0} {
-	    set err [string range $err [expr {$i + 6}] end]
-	}
-	show_error {} . "[mc "Bad arguments to gitk:"]\n$err"
-	exit 1
+        # unfortunately we get both stdout and stderr in $err,
+        # so look for "fatal:".
+        set i [string first "fatal:" $err]
+        if {$i > 0} {
+            set err [string range $err [expr {$i + 6}] end]
+        }
+        show_error {} . "[mc "Bad arguments to gitk:"]\n$err"
+        exit 1
     }
 }
 
@@ -12599,7 +12631,7 @@ set cdup {}
 if {[expr {[exec git rev-parse --is-inside-work-tree] == "true"}]} {
     set cdup [exec git rev-parse --show-cdup]
 }
-set worktree [exec git rev-parse --show-toplevel]
+set worktree [gitworktree]
 setcoords
 makewindow
 catch {
@@ -12650,15 +12682,15 @@ if {$cmdline_files ne {} || $revtreeargs ne {} || $revtreeargscmd ne {}} {
 
 if {[info exists permviews]} {
     foreach v $permviews {
-	set n $nextviewnum
-	incr nextviewnum
-	set viewname($n) [lindex $v 0]
-	set viewfiles($n) [lindex $v 1]
-	set viewargs($n) [lindex $v 2]
-	set viewargscmd($n) [lindex $v 3]
-	set viewperm($n) 1
-	set viewchanged($n) 0
-	addviewmenu $n
+        set n $nextviewnum
+        incr nextviewnum
+        set viewname($n) [lindex $v 0]
+        set viewfiles($n) [lindex $v 1]
+        set viewargs($n) [lindex $v 2]
+        set viewargscmd($n) [lindex $v 3]
+        set viewperm($n) 1
+        set viewchanged($n) 0
+        addviewmenu $n
     }
 }