RFE: Easily accessible extra context around comments

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When doing a code review, it's difficult to go through the comments because both views are lacking:

• the activity view shows comments, but with little context. It would be nice if you could click on the diff and expand inline the context around the comment.
• the diff view shows enough context, but in long diffs it's not easy enough to jump between comments. Buttons and/or keyboard shortcuts for going to the next/prev comment would be helpful.