vim: Add U to undo last line (#33571)

Closes #14760

Still TODO:

* Vim actually undoes *many* changes if they're all on the same line.

Release Notes:

- vim: Add `U` to return to the last changed line and undo
8e8a772c2dConrad Irwin committed on 7/9/2025, 3:24:43 AM· committed by GitHubparentdf57754
7 files changedLine totals unavailable