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

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Date: Thu, 02 Mar 2017 17:32:52 -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.
> 
> But that means we need to watch variable assignments, marker
> modifications, and symbol property modifications.  Using overlays gets
> us all this "for free" because we already watch all overlay modifications.

Variables and markers, yes.  Symbol properties: I don't see why would
we need to watch them.

Anyway, it was just a thought.  It sounds like a conceptually simpler,
even if the implementation is somewhat hairy.