bug#20802: Segfault when showing non-GTK+ tooltip

[Eli Zaretskii]

> Date: Mon, 15 Jun 2015 18:00:55 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: tobias.getzner@gmx.de, 20802@debbugs.gnu.org
> 
> One last question: In struct image_cache we specify refcount as
> ptrdiff_t while w32fns.c defines image_cache_refcount as int.  Both
> xfns.c and nsfns.m define image_cache_refcount as ptrdiff_t.  Shouldn't
> we uniquify this?

Yes, please.  The fewer differences between the various *fns.c and
*term.c functions with similar, let alone identical names, the better.

Thanks.