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From: Michael Heerdegen <michael_heerdegen@web.de>
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Subject: Re: How to temporarily show an image in an Emacs buffer?
Date: Sun, 12 Mar 2023 04:37:18 +0100
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Marcin Borkowski <mbork@mbork.pl> writes:

> I didn't experiment with this, but I'm afraid that interlacing changes
> to the buffer done by the user (when recording undo changes) and by the
> Elisp code (while `buffer-undo-list' is bound to `t') may result in
> undoing being impossible.

Yes, what is allowed is very limited.  AFAIU anything changing any
positions is already very bad (undo positions are numbers, not markers).

Michael.