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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: Tue, 28 Feb 2017 20:09:39 +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: Tue, 28 Feb 2017 12:47:05 -0500
> 
> > Stefan, I don't understand the new semantics of
> > overlay_arrows_changed_p, and even less so after your latest updates.
> 
> Does the patch below clarify the situation and clean up the behavior enough?

Yes, thanks.

> I'm still wondering about
> 
>                 /* FIXME: Don't we have a problem, using such a global
>                  * "last-position" if the variable is buffer-local?  */

I'm not sure I understand the concern.  The position is a marker, so
it specifies the buffer as well.