<!--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=13931) </details> <!--IssueSummary end--> To make GitLab a little bit easier to use when writing things, it would be nice if markdown files in the diff view of merge requests could offer a preview function. Right now you can use view file, but that opens in another window. This would helps us with blog posts as well. @dzaporozhets thoughts? cc @ernstvn