Allow reviewer to suggest a commit message when suggesting changes
<!--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=518632) </details> <!--IssueSummary end--> # What There are currently three options to commit suggested changes: * Use the default commit message * Configure a [message template](https://docs.gitlab.com/ee/user/project/merge_requests/commit_templates.html) * Let the **author** of the MR customize the commit message I would like to propose a fourth option: * Let the **reviewer** customize the commit message and offer this to the author as part of the suggestion # Why Often times, when applying suggested changes * Authors might want to get through quickly and therefore might tend to take the default that is offered to them * Authors already need to wrap their head around what the reviewer is suggesting while the reviewer already knows what the change is about when they are done writing their suggestion # Mockups ![image](/uploads/3066851f3d56417a79dacb5a7beeeb95/image.png)\ (The syntax is just an idea) ![image](/uploads/24e0b2964c4771932437b5e91c799669/image.png) ![image](/uploads/3dfb17578934565d6b82a0f72bc6e90f/image.png) # Furthermore * Technically, we could allow _any_ argument of `git commit` (like `--fixup` (#325951), `--squash`, `--trailer` (this could be useful for #526258))
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