GNU bug report logs - #79200
31.0.50; Duplicated elements for '#<marker at' in buffer-undo-list

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Message #128 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Óscar Fuentes Óscar Fuentes
 <oscarfv <at> telefonica.net>
Cc: 79200 <at> debbugs.gnu.org, Pip Cet via <bug-gnu-emacs <at> gnu.org>,
 Pip Cet <pipcet <at> protonmail.com>, Pengji Zhang <me <at> pengjiz.com>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#79200: 31.0.50; Duplicated elements for '#<marker at' in
 buffer-undo-list
Date: Sat, 09 Aug 2025 14:54:42 +0200

Óscar Fuentes Óscar Fuentes <oscarfv <at> telefonica.net> writes:

> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
>
>>> Looks like the patch puts igc on the same footing as master wrt the
>>> required work to reproduce the problem.
>>
>> That's something, thanks to Pip!
>>
>> Can you determine if these are different markers (sxhash-eq)?
>
> Yes, sxhash-eq indicates that there are repeated markers, but not into
> the same sequence. Actually, the sequences themselves are repeated:
>
> (this is on igc with Pip's patch applied, but without reverting the
> commit I identified)

Thanks. If they are not in the same group then trying to coalesce
entries is not worth it, I think.

Maybe another case like that of the mode-line. Without something rr
pretty hard to debug (no rr on macOS :-/).

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