In x_set_font mark frame as garbaged (Bug#16028).

* frame.c (x_set_font): Mark frame as garbaged (Bug#16028).

src/ChangeLog

+2013-12-08  Martin Rudalics  <rudalics@gmx.at>
+
+	* frame.c (x_set_font): Mark frame as garbaged (Bug#16028).
+
 2013-12-08  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Use libcrypto's checksum implementations if available, for speed.

src/frame.c

@@ -3314,9 +3314,13 @@ x_set_font (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 #endif
   /* Recalculate toolbar height.  */
   f->n_tool_bar_rows = 0;
+
   /* Ensure we redraw it.  */
   clear_current_matrices (f);
 
+  /* Attempt to hunt down bug#16028.  */
+  SET_FRAME_GARBAGED (f);
+
   recompute_basic_faces (f);
 
   do_pending_window_change (0);