- When collapsing, scroll back to the first comment instead of hanging in the Recommended section.
- Enhancement for 5380bc04: don't show "Collapse/Expanse" if there's only 1 comment. The comment itself is already collapsed to 3 lines, so it won't take up too much height.
- Fix css: recalling what Dan mentioned: if following BEM right (modifiers shouldn't be used standalone), we wouldn't incorrectly use `@extend` in this case and confuse the reader.
- Enlarged the empty spacing to make it symmetrical with the Recommended section below it.
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