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: Alan Mackenzie <acm <at> muc.de>
Cc: pipcet <at> protonmail.com, Helmut Eller <eller.helmut <at> gmail.com>, Óscar Fuentes <oscarfv <at> eclipso.eu>, monnier <at> iro.umontreal.ca, 79200 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: bug#79200: 31.0.50; Duplicated elements for '#<marker at' in buffer-undo-list
Date: Thu, 14 Aug 2025 11:53:40 +0200

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

> Alan Mackenzie <acm <at> muc.de> writes:
>
>> For what it's worth, I put next--marker-id into my Emacs, just as a
>> counter, nothing else.
>>
>> In my emacs -Q, I do C-h v next--marker-id like you did, and a repeated
>> g to refresh it.  I get just 76 markers made at each iteration.
>
> Also interesting. With emacs -Q -nw, I get a delta of ca. 140, and in
> the GUI (mac) I get 270.
>
>> That makes your 472 look high indeed.  Might it possibly be there's a
>> bug with DEFVAR_INT somewhere, and that 472 = 8 * 59 has wrongly got the
>> 3 type bits in it, and is really just 59?  Just a suggestion.
>
> I think that's unlikely. There are a lot such defvar, and I think
> someone would have noticed such a bug.

Another interesting detail that I didn't remember are the values of
undo-limit and undo-strong-limit. I don't understand why they are so
high (160000/240000). With 1 undo/s, I could undo for 2 days.

Whatever, Maybe I'm overlooking something here. 

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