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

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Message #38 received at 79200 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Óscar Fuentes <oscarfv <at> eclipso.eu>
Cc: 79200 <at> debbugs.gnu.org, Pip Cet <pipcet <at> protonmail.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 11:22:58 +0200

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

> Óscar Fuentes <oscarfv <at> eclipso.eu> writes:
>
>> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
>>
>>> 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.
>>
>> However, it seems that on igc it is more easily reproducible.
>>
>> For a moment I thought that I messed up my bug report, because a couple
>> of attempts at reproducing the problem on master failed, but then I made
>> a few more undos/redos and the sequences of duplicated elements
>> appeared.
>>
>> Something triggers this and then explodes.
>
> Okay, thanks. At least I don't have to check if I made a cockpit error
> :-). But I guess I have to check emacs-30 again, if this is kind of
> "random".

Or it's related to what Pip said about compact_...

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