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Re: undo-auto--undoable-change infloop

From: Michael Heerdegen
Subject: Re: undo-auto--undoable-change infloop
Date: Sat, 30 Jul 2022 06:14:59 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Michael Heerdegen <michael_heerdegen@web.de> writes:

> I once used an variable watcher on timer-list and saw that it contained
> hundreds or thousands of instances of my timer.  But these were not
> different instances, I only ever create one timer when stating logging.
> Ant the value list looked like (#1=[ilog-timer] #1# #1# ...very very
> many #1#s and a few different timers).

BTW, all these copies appear out of nothing: the variable watcher saw
very few timers, and then suddenly that many the next time the
WATCH-FUNCTION was called.  If they would have been added explicitly
from Lisp, I would see intermediate steps AFAIU.

I collected a backtrace from the moment of time when the variable
watcher fired (via WATCH-FUNCTION).  It was totally unrelated and I'm
quite sure that it isn't related.

> Now I'm trying to protect the timer using a flag with the purpose to
> prevent the timer function to do anything when the timer function is
> currently called.
> But does that even make sense

After thinking about it, I think it doesn't make sense, and it also
doesn't work.


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