<!--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=421368) </details> <!--IssueSummary end--> When whitespace is hidden, the diff line numbers can be incorrect, e.g:  This can be confusing to the user, at the same time these numbers are correct. Perhaps we could add a visual indicator such as an icon to indicate when a user is hiding whitespace?