[Feedback] Linked file (previously: Pinned File)

Please provide the feedback for the linked file feature in this issue.

There are known issues with this feature that are already tracked:

1. With FF pinned_file enabled and only a single f... (#438668 - closed)
2. Polish pinned file corners (#437618 - closed)
3. Color code pinned file item in the file browser (#437614 - closed)
4. Linked line is not highlighted when using pinne... (#434347 - closed)
5. [merge requests] diff_by_file_hash action retur... (#437724 - closed)