Add unfold links for Side-by-Side view
What does this MR do?
Add unfold links for Side-by-Side view and refactor some diff related code
What are the relevant issue numbers?
Closes #3877 (closed)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together