When the row mounted for the first time on a comparison the Changes panel had
already loaded, it recorded the current change key without refreshing. A still-fresh
cached result from before an edit was then shown until the next change. A first look
now refreshes when it finds cached data and no request is already in flight, so a
mount that starts its own fetch still makes only one request.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>