cssnode: Add optimization

Don't even try to propagate changes when we know there are none.

diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index cb2b43d62a045e048820503b5b0eb9dd702b1e08..d6c2c4093345d838629fc733e55244342cc1528f 100644 (file)
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -579,6 +579,9 @@ gtk_css_node_propagate_pending_changes (GtkCssNode *cssnode,
   if (style_changed)
     change |= GTK_CSS_CHANGE_PARENT_STYLE;
 
+  if (!cssnode->invalid && change == 0)
+    return;
+
   for (child = gtk_css_node_get_first_child (cssnode);
        child;
        child = gtk_css_node_get_next_sibling (child))