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.

1 files changed, 6 insertions, 0 deletions

diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index a1bbe77d36..0772369fae 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
     {