Work Item: Advanced description diff

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MVC 2 from #390376 (closed)

Post-MVC1: Additional exploration

1. Provide a UI mechanism to view the description diff in line with the primary description area. [1]
   • Potential challenge: If we show the diffs within the description, will there be conflicts depending on which type of editor is currently selected? Does it matter? [1]:
2. Provide a diffs viewer, separate from the editor, with all revisions and ability to restore previous versions
3. Provide a "Comments" filter, with shortcuts from edited note