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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [Emacs-diffs] master fd8f724: * src/xdisp.c
	(overlay_arrows_changed_p): Fix last change.
Date: Thu, 02 Mar 2017 22:18:40 +0200
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: emacs-devel@gnu.org
> Date: Thu, 02 Mar 2017 13:29:23 -0500
> 
> > Isn't it easier to keep the record of changes in these variables in
> > the buffer object, like we do with BUF_MODIFF etc.?
> 
> I don't understand the question.  Which "these variables" are you
> talking about?

The 3 variables related to overlay-arrow whose changes need to trigger
redisplay of the respective buffers: overlay-arrow-position,
overlay-arrow-string, and overlay-arrow-bitmap.