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

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Package: emacs;

Reported by: Óscar Fuentes <oscarfv <at> eclipso.eu>

Date: Fri, 8 Aug 2025 16:45:03 UTC

Severity: normal

Found in version 31.0.50

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: 79200 <at> debbugs.gnu.org
Cc: Óscar Fuentes <oscarfv <at> eclipso.eu>
Subject: bug#79200: 31.0.50; Duplicated elements for '#<marker at' in buffer-undo-list
Date: Thu, 14 Aug 2025 09:49:40 -0400

Taking a step back:

We may want to rethink whether storing that undo information is worth
the trouble at all.  It's hard to know for sure, but we do have one data
point: in Emacs-28, overlays' end-points used those marker-offset undo
elements to better preserve overlays' end-points across undo, whereas
this was lost with emacs-29's new overlays.

AFAIK nobody noticed/complained.


        Stefan
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