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

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Óscar Fuentes <oscarfv <at> eclipso.eu>
Cc: gerd.moellmann <at> gmail.com, 79200 <at> debbugs.gnu.org, monnier <at> iro.umontreal.ca
Subject: bug#79200: 31.0.50; Duplicated elements for '#<marker at' in buffer-undo-list
Date: Sat, 09 Aug 2025 12:19:51 +0300

> Cc: 79200 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
> Date: Sat, 09 Aug 2025 11:01:37 +0200
> From:  Óscar Fuentes via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
> 
> > Óscar Fuentes <oscarfv <at> eclipso.eu> writes:
> >
> >> emacs -Q
> >>
> >> write in *scratch* some lines with random words:
> >>
> >> arins
> >> arseina
> >> aierni
> >>
> >> iosrn nioni
> >> ionugfw
> >>
> >> sronuf
> >>
> >> Now undo a few of those lines (C-_), move the cursor and C-_ again to
> >> redo.
> >
> > Interesting. I come from a slightly different angle, that in my mac+igc
> > port I had sometimes only 3 undos before I got "no more undo
> > information". and I thought I had messed up something.
> 
> Same here, but igc/Linux. Please note that the recipe on my report is
> with yesterday's master, though.

I cannot reproduce on master.  Maybe you should try invoking GC there
before you look at the value of buffer-undo-list.

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