cssstyle: Add optimization

There is no difference between a style and itself.

diff --git a/gtk/gtkcssstyle.c b/gtk/gtkcssstyle.c
index 040998b6cb7eefb83b267d21d28a75c16bce40cd..084919159ec6468f8d90549904d75d989e20f71b 100644 (file)
--- a/gtk/gtkcssstyle.c
+++ b/gtk/gtkcssstyle.c
@@ -82,6 +82,9 @@ gtk_css_style_get_difference (GtkCssStyle *style,
   GtkBitmask *result;
   guint i, len;
 
+  if (style == other)
+    return _gtk_bitmask_new ();
+
   result = _gtk_bitmask_new ();
   len = _gtk_css_style_property_get_n_properties ();
   for (i = 0; i < len; i++)