TortoiseGitBlame should have an option to show merges instead of checkpoint commits

If you are using the workflow where you squash every merge, this feature request is not for you. :)

But if you keep branch commits, it would be very useful to have an option to show the commit when a line was merged into the current branch instead of showing the commit on the branch.

This can be achieved in the following way:

• Before running git blame, run git rev-list --first-parent HEAD (or the respective Ref)
• Prepend every returned line with the previous line, just as | awk '{print p " " $0}{p=$0}' does
• Write the result to a temporary file
• Call git blame with the -S tempfile option

For each line you will see when a line was merged into the current branch.