RFE: teach gitk to automatically mark .git/rebase-merge/stopped-sha

[Mikko Rantalainen <mikko.rantalainen@peda.net>]

While doing long rebases (I'm currently rebasing a feature branch with
166 patches) and rebase stopping in the middle of rebase, locating the
old patch in gitk is sometimes hard.

Could gitk automatically mark the original patch that failed to rebase
after I press F5?

The failing original commit SHA-1 can be found in file
.git/rebase-merge/stopped-sha but as far as I know, git does have
logical commit name similar to HEAD, ORIG_HEAD or anything else for this
case so there's no easy way to get already running gitk to mark this patch.

Of course, doing the same thing for failed cherry-picks would be nice,
too but in that case it's pretty clear where the source patch is.

As a workaround I currently have to do something like
  git tag -f FAILED_HEAD $(cat .git/rebase-merge/stopped-sha)
after seeing rebase failure. Then I can hit F5 in gitk to easily locate
the source commit.

PS. Is there a way to automatically run git tag -f FAILED_HEAD $(cat
.git/rebase-merge/stopped-sha) if rebase fails in the middle of branch?

-- 
Mikko