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 <cygwin@cygwin.com>
Compiled by <cygwin@cygwin.com>
Huge version with GTK3 GUI. Features included (+) or not (-):
<...snip...> +persistent_undo <...snip...>
undofile) is going to be the state of the buffer at the time it was loaded. So if I dovim file,ochange<esc>:write<cr>, I can stillupast that:write(most recent save). But if I understand your question, you say sometimes this doesn't work? Maybe checkundolevels. Also:help :undolistand related commands/sections.undolevelsbecause it's only a few actions back in time. As forundolist, I will try that the next time I see the problem (which is not frequent). At this instant, I've made far too many changes to the*.texfile.:undolistcommand didn't show much. Two unspecified changes a few minutes back. It doesn't matter whether I repeatCtrl+Runtil I run out of redo's or repeatuuntil I run out of undo's. Nothing visibly changes in the file when I do either of those, and:undolistshows the same two changes in both cases.:verbose set undolevels?(before and after it happens)? Isautoreadset?