Block merging if fixup commits exist

[pboushy]

🏷️ Discussion Type

Product Feedback

Body

Until Github supports auto-merging fixups, it would be helpful if having fixup commits would automatically block merging until they are squashed.

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[abdikadirjerry]

I think this would be especially useful for teams that follow a “clean history” workflow. One possible approach would be to add an optional repository or branch protection rule that blocks merging when commits matching Git's fixup conventions are present.

It would be helpful if GitHub could also offer an automatic squash or rebase option, with a clear preview of the resulting commit history before merging. This would help teams avoid accidentally merging temporary fixup commits while still allowing maintainers to choose their preferred workflow.

Would this work better as an optional branch protection rule, rather than a default behavior for all pull requests?