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

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From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Pip Cet <pipcet <at> protonmail.com>
Cc: Óscar Fuentes <oscarfv <at> eclipso.eu>, Stefan Monnier <monnier <at> iro.umontreal.ca>, 79200 <at> debbugs.gnu.org
Subject: bug#79200: 31.0.50; Duplicated elements for '#<marker at' in buffer-undo-list
Date: Sat, 09 Aug 2025 11:01:56 +0200

Pip Cet <pipcet <at> protonmail.com> writes:

> insertions.
>
>> So far I can't see what is the cause. I would have guessed something in
>> or around primitive-undo, but that hasn't changed forever.
>>
>> Adding Stef.
>
> Well, compact_undo_list is a nop with HAVE_MPS:

Sorry, I forgot to mention an important detail: this happens in master
but not emacs-30. Oscar's report is also for master, IIRC.

Really puzzling.

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