[gtk+] cssnode: Clear cache if reusing style

[Benjamin Otte <otte src gnome org>]

commit f6606c4f6f7fc1b078978caf7e35cf1c8e69e6e7
Author: Benjamin Otte <otte redhat com>
Date:   Tue Dec 15 01:07:03 2015 +0100

    cssnode: Clear cache if reusing style
    
    When we reuse styles that didn't change across changes to the source
    CSS, make sure we clear the caches. Otherwise child nodes will pick up
    styles from the old source CSS.

 gtk/gtkcssnode.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index a1bbe77..0772369 100644
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -1034,6 +1034,12 @@ gtk_css_node_ensure_style (GtkCssNode *cssnode,
 
       style_changed = gtk_css_node_set_style (cssnode, new_style);
       g_object_unref (new_style);
+
+      if (!style_changed && (cssnode->pending_changes & GTK_CSS_CHANGE_SOURCE))
+        {
+          /* clear the global cache if we reuse the same style after the CSS changed */
+          g_object_set_qdata (G_OBJECT (cssnode->style), quark_global_cache, NULL);
+        }
     }
   else
     {