* Abort merge if head has been updated before pressing merge
It is possible that a PR head may be pushed to between the merge page being shown
and the merge button being pressed. Pass the current expected head in as a parameter
and cancel the merge if it has changed.
Fix #18028
Signed-off-by: Andrew Thornton <art27@cantab.net>
* adjust swagger
Signed-off-by: Andrew Thornton <art27@cantab.net>
* fix test
Signed-off-by: Andrew Thornton <art27@cantab.net>
* placate lint
Signed-off-by: Andrew Thornton <art27@cantab.net>