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From: Jens Schmidt via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: delete lines with overlays [workaround to diff mode]
Date: Wed, 30 Aug 2023 00:03:01 +0200
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On what Emacs version exactly are you?  Probably a minor patch on
function `diff--refine-hunk' could do what you want...