Re: [Emacs-diffs] master fd8f724: * src/xdisp.c (overlay_arrows_changed_p): Fix last change.

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Date: Tue, 28 Feb 2017 13:58:04 -0500
> 
> We have a list of variables, and we store the last position of the
> marker held in that variable in a symbol property.
> 
> If that variable is buffer-local, then that same variable can contain
> several markers (upto one per buffer) yet it only has a single property
> to keep the old value, that needs to be shared by all those
> markers/buffers.

But we only care what happens with these between two successive
redisplay cycles.  What kind of scenario could possibly change that
variable in more than one buffer?