<!--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=29035) </details> <!--IssueSummary end--> ## Summary The new merge request diff header. ## Improvements The diff header for submitted merge requests has been refactored to use `diff_file_header.vue`. New merge requests should do the same. ## Risks I don't believe there are any risks as this has already been done for submitted MRs and the functionality is the same. ## Involved components app/assets/javascripts/diffs/components/diff_file_header.vue app/views/projects/diffs/_file_header.html.haml ## Optional: Intended side effects The file diffs headers should match. ## Optional: Missing test coverage N/A