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: Pip Cet <pipcet <at> protonmail.com>
Cc: gerd.moellmann <at> gmail.com, 79200 <at> debbugs.gnu.org, oscarfv <at> eclipso.eu, monnier <at> iro.umontreal.ca, acm <at> muc.de
Subject: bug#79200: 31.0.50; Duplicated elements for '#<marker at' in buffer-undo-list
Date: Sun, 10 Aug 2025 07:45:14 +0300

> Cc: 79200 <at> debbugs.gnu.org, Alan Mackenzie <acm <at> muc.de>,
>  Stefan Monnier <monnier <at> iro.umontreal.ca>,
>  Óscar Fuentes <oscarfv <at> eclipso.eu>
> Date: Sat, 09 Aug 2025 18:30:37 +0000
> From:  Pip Cet via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> I think it may make more sense to find out who goes around creating
> markers and not cleaning up after them.

Isn't that format_mode_line_unwind_data, which you found, and the
missing detach_marker call?

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