Resolve "Resolved comments permanently hidden in Side-by-Side diff view"
What does this MR do? / Why was this MR needed?
Ensures resolved discussions are made visible when clicking "toggle comments" on Side-by-Side view diff pages.
Does this MR meet the acceptance criteria?
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CHANGELOG entry added - Tests
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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
What are the relevant issue numbers?
Closes #21535 (closed)