A userscript that toggles diff/PR comments

• Comment block:
  • Each comment block now has a clickable toggle arrow in the upper right corner.
  • Click to collapse or expand the comment block.
  • Use Shift + click to collapse or expand all comment blocks in the file.
• File block:
  • Show/Hide:
    • The ugly checkbox with a "Show comments" label is replaced with a "Show or hide all comments in this file" button.
    • Click to show or completely hide all the comment blocks in the file.
    • Use Shift + click to show or completely hide all the comment blocks in the file.
  • Expand/Collapse:
    • An "Expand or collapse all comments in this file" button was added next to the show/hide button.
    • Click to expand or collapse all the comments blocks in the file.
    • Use Shift + click to collapse or expand all comment blocks on the page.
• Pull Request Toolbar/Sticky Header
  • Show/Hide:
    • A "Show or hide all comments" button was added next to the "Unified/Split" button.
    • Click to show or completely hide all the comment blocks on the page.
  • Expand/Collapse:
    • A "Expand or collapse all comments" button was added next to the "Unified/Split" button.
    • Click to expand or collapse all the comment blocks on the page.

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