The File Log or Subdir Log windows do not allow to commit, so this command would be useless there.

Did you see the 3 options of the "Auto-Squash"-button in the Interactive Rebase dialog?

But it would be tricky, because there could be other obsolete worktrees, too, that silently could be deleted, too.

Please try version 19.1.

I've scheduled it for the Journal for v19.2. What exactly do you mean with "Log for" Graph window?

In what details the current implementation differs from your expected behavior?

Sorry, then I misunderstood the request.

IMHO, Git only supports "Prune obsolete worktrees" which already exists as a menu item.

Please use "Use Message for Commit" and then the interactive rebase. It highlights equally named commits and offers auto-squash commands.