compare a single file across two commits in the same branch
<!--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=16860) </details> <!--IssueSummary end--> ### Description At the moment GitLab can show a compare across commits, but when the commit contains multiple files, this can result in a "large" web page. In the situation where there are multiple files changed in the commit, being able to inspect the changes in a single file would result in a smaller (faster to render) page and by not having the other files there would be simpler for collaboration ### Proposal Add the capability to compare single files across commits ### Links / references
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