bug#37637: 27.0.50; Segmentation fault when setting font face for new frames

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 08 Oct 2019 14:56:58 +0200
> From: Andreas Hilboll <andreas.hilboll@posteo.de>
> 
> > diff --git a/src/font.c b/src/font.c
> > index 935dd64..044c437 100644
> > --- a/src/font.c
> > +++ b/src/font.c
> > @@ -3314,6 +3314,9 @@ font_open_for_lface (struct frame *f,
> > Lisp_Object entity, Lisp_Object *attrs, Li
> >  	    pt = XFIXNUM (attrs[LFACE_HEIGHT_INDEX]);
> >  	  else
> >  	    {
> > +	      /* We need the default face to be valid below.  */
> > +	      if (FRAME_FACE_CACHE (f)->used == 0)
> > +		recompute_basic_faces (f);
> >  	      struct face *def = FACE_FROM_ID (f, DEFAULT_FACE_ID);
> >  	      Lisp_Object height = def->lface[LFACE_HEIGHT_INDEX];
> >  	      eassert (FIXNUMP (height));
> 
> Great, this seems to fix it.  Works without problems now (after opening 
> ~10 new frames without any crash I stopped ...).

Thanks, pushed to the master branch, and closing the bug report.