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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.
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Please try version 19.1.