Gregory's Server#Emacs undo limited to the active region is a super power. Just like regular undo, but only applies to the selected area. e.g., undo changes in this paragraph/page/function etc., leaving the rest of the file untouched.
And the best part is it just works - highlight the region, undo (& keep undoing, as needed).
Saved me a lot of grief today!
@plantarum i have never not had it bug on me, and when it bugs on me, it breaks my entire undo-history and i have to have a little cry because i'm even further away from patching my way back to what i wanted.
i never understood the bugginess, emacs just hangs till i quit out of it.
@plantarum I'm constantly amazed that there are "Oh, cool" things in emacs that I never knew about lurking around every corner after ~46 years as a user.
@plantarum TIL - after more than 3 decades