bug#23386: Segfault when messing with font-backend

[Dmitry Antipov]

On 07/12/2016 08:45 PM, Eli Zaretskii wrote:

> > --- a/src/frame.c
> > +++ b/src/frame.c
> > @@ -3712,7 +3712,11 @@ x_set_font_backend (struct frame *f, Lisp_Object 
> > new_value, Lisp_Object old_valu
> >      return;
> >
> >    if (FRAME_FONT (f))
> > -    free_all_realized_faces (Qnil);
> > +    {
> > +      Lisp_Object frame;
> > +      XSETFRAME (frame, f);
> > +      free_all_realized_faces (frame);
> > +    }
>
> Since free_all_realized_faces with a nil argument will free faces on
> all frames, can you tell why this hunk was needed?

Hmm...hopefully there are no reasons to disturb other frames when we change
font backend(s) on the only one.

Dmitry