<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=20309) </details> <!--IssueSummary end--> ### Description It recently happened to me that I created a [fixup commit](https://robots.thoughtbot.com/autosquashing-git-commits) and forgot to squash them before merging my MR. ### Proposal It would be useful if the GitLab UI warned or refused to merge a commit which starts with `fixup!`. ### Links / references