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

[Eli Zaretskii]

> Date: Tue, 16 Jun 2015 15:30:14 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: tobias.getzner@gmx.de, 20802@debbugs.gnu.org
> 
> In 32a4883..93ae9f4 master -> master I checked in a fix for X and NS
> although I wasn't able to reproduce the crash on the latter (probably
> due to the fact that on NS like with the native Gtk tooltips one can't
> override the colors anyway).
> 
>  >> 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.
> 
> I made it a ptrdiff_t on Windows.

Thanks.