Subject: Re: bug#79200: 31.0.50; Duplicated elements for '#<marker at' in buffer-undo-list

From: Stefan Monnier <[email-masked]>
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