gtk: bail out in render_background_internal() if the extents are <= 0

otherwise we run into scaling the cairo_t into a borken state that's
not fixable by cairo_restore().

diff --git a/gtk/gtkthemingengine.c b/gtk/gtkthemingengine.c
index 8c090ad12902000237619a181ca7294d231b51cd..da95aeb9ee223db8548ab2539f012c102698525c 100644 (file)
--- a/gtk/gtkthemingengine.c
+++ b/gtk/gtkthemingengine.c
@@ -1490,6 +1490,9 @@ render_background_internal (GtkThemingEngine *engine,
   gint radius, border_width;
   GtkBorderStyle border_style;
 
+  if (width <= 0 || height <= 0)
+    return;
+
   flags = gtk_theming_engine_get_state (engine);
   cairo_save (cr);