on
>
> I assume I'm missing something simple about how undo is supposed to
> work
> between these two events, but I can't figure out what. Any hints
> appreciated.
>
I got things working but still not sure exactly what was wrong.
Somehow
the BufWritePre and BufWritePost autocommands were getting set
twice and both sets of functions were called twice, with second undo
adding
and extra undo. I don't know how they were getting called twice, but
clearing
the the autocommands before assigning results in only one set. I'm
also
not sure why there was a problem even with two sets, since I made sure
that
at least one change was always made in BufWritePre, but in any case
things
are working now. . .
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