WIP: Show viewing and viewed info in diff file tree
What does this MR do?
This addresses https://gitlab.com/gitlab-org/gitlab-ce/issues/52485, by making files in the diff file tree show bold when unread and highlight when they are currently focused.
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation created/updated or follow-up review issue created -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Database guides -
Separation of EE specific content
Performance and testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. -
Tested in all supported browsers
Closes #52485 (moved)