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zsh/Functions/Zle/down-line-or-beginning-search

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# Like down-line-or-search, but uses the whole line prefix up to the
# cursor position for searching forwards.
if [[ ${+NUMERIC} -eq 0 &&
( $LASTWIDGET = $__searching || $RBUFFER != *$'\n'* ) ]]
then
[[ $LASTWIDGET = $__searching ]] && CURSOR=$__savecursor
__searching=$WIDGET
__savecursor=$CURSOR
if zle .history-beginning-search-forward; then
[[ $RBUFFER = *$'\n'* ]] ||
zstyle -T ':zle:down-line-or-beginning-search' leave-cursor &&
zle .end-of-line
return
fi
[[ $RBUFFER = *$'\n'* ]] || return
fi
__searching=''
zle .down-line-or-history