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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Editing change groups
Date: Fri, 09 Nov 2018 08:52:02 -0500
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>   (let ((g (prepare-change-group)))
>     (insert "a\n")
>     (activate-change-group g)

You (*really*) shouldn't modify the buffer between prepare-change-group
and activate-change-group.


        Stefan