Fix/visual revisions autosave diff 80455 - #80669
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What?
Closes 80455
Fixes Visual Revisions incorrectly highlighting unchanged blocks as additions when viewing an autosave.
Why?
Autosaves without an older revision were compared against empty content, causing every block to appear newly added.
How?
Autosaves are now compared against the currently saved post. The existing E2E test now verifies that only newly added content receives addition highlighting.
Testing Instructions
wp.data.dispatch( 'core/editor' ).autosave()in the browser console.Testing Instructions for Keyboard
Follow the instructions above using Tab, Shift+Tab, Enter, and standard editor keyboard controls. Confirm the Visual Revisions controls remain keyboard accessible.
Screenshots or screencast
Not applicable.
Use of AI Tools
OpenAI Codex was used to investigate the issue, implement the fix, and draft tests and documentation. The changes were reviewed and validated by the contributor.