I am editing a
*.tex file. I don't have persistent-undo set. However, I can normally undo beyond my last save so long as I don't exit the file. That's fine.
Sometimes, however, I am presented with the message "Already at oldest change". That's quite a downer. Why does this happen sometimes?
My Vim version is below. It includes persistent-undo, but it shouldn't matter in the context of this question.
VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Dec 12 2021 19:50:09) Included patches: 1-3755 Modified by <[email protected]> Compiled by <[email protected]> Huge version with GTK3 GUI. Features included (+) or not (-): <...snip...> +persistent_undo <...snip...>