Is there a minor mode in Emacs that will highlight changes made to a buffer? I’m picturing something like highlight tails without a timeout feature. I would use highlight tails for this and change the timeout rate to be something huge, but the mode seems to consume a bit of CPU to do the timing (a feature I wouldn’t use).
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EmacsWiki is usually your friend for things like this. Sounds like you might want highlight-changes-mode.