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Enter git rerere: https://git-scm.com/docs/git-rerere

This will "REuse REcorded REsolutions" of conflicted merges.

Once enabled, it will record how a merge conflict was resolved, and replay it back the next time it encounters it. Saves a lot of time in cases where you already solved the merge once before.

https://git-scm.com/book/en/v2/Git-Tools-Rerere

rerere gives me nightmares. Much prefer some delicate merging footwork if at all possible.

I can confidently say I've never encountered this. To diagnose I'd have to see what exactly you are doing, but I suspect you have issues with the way you organize your work. Git is not a magic wand. Making effective use of a hammer starts with the boards and nails.

True, it's one of the downsides. You have to also be in the 'short-lived branches' camp for it to work well - which you should!