Subject: bug#34405: 26.1; patch for cancel-change-group to work after undo

From: Eli Zaretskii <[email-masked]>
Date: Thu, 14 Nov 2019 14:10:44 +0200

> From: Braun Gábor <[email-masked]>
> Date: Tue, 12 Nov 2019 18:05:48 +0100
> 
> Please consider the following fix to the problem, patching function 
> cancel-change-group.

Thanks.

If this problem could be solved locally in the atomic groups code, I'd
prefer that.  If not, then let's postpone changes in the low-level
undo machinery until after the emacs-27 branch is cut, as I'd like to
avoid adding more changes in such deep innards.