Show related merge requests in the blob view
### Problem to solve If I'm reading a file in GitLab, I want to know if there are any merge requests about to change the file. ### Further details - **Updating www-gitlab-com** I often know there are changes pending for a specific file but don't know which merge request they are in. ### Proposal When viewing a blob, give me a link to a filtered list of merge requests or a link to each MR directly. ### Links / references
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