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Discussion diff CSS problem (doubled line height)

It seems there is a bug with the diff show in a merge request discussion for markdown content. Indeed, when someone comment on a modified markdown file, each line in the diff is doubled compared to what it should be be. The line has 36px in height where it should have only 18px.

Here an image of the problem:

gitlab_markdown_discussion_diff_bug

I prepared a repo on gitlab so you can check this. Simply go in the merge request to see it in action:

https://gitlab.com/maoueh/bug-markdown-discussion-diff-ui/merge_requests/1

Regards, Matt