widget: Don't snapshot foreign children

When snapshotting, we walk down the widget tree.
We need to skip children that have a different
surface, since those will do their own snapshot.

diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index b771d25b51c3980c7697ad8d956faed36524f53e..0f21d1d3600c7e1eb217d1ee17198a224af838df 100644 (file)
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -13367,6 +13367,8 @@ gtk_widget_forall (GtkWidget   *widget,
  *
  * gtk_widget_snapshot_child() takes care of translating the origin of
  * @snapshot, and deciding whether the child needs to be snapshot.
+ *
+ * This function does nothing for children that implement #GtkNative.
  **/
 void
 gtk_widget_snapshot_child (GtkWidget   *widget,
@@ -13378,6 +13380,9 @@ gtk_widget_snapshot_child (GtkWidget   *widget,
   g_return_if_fail (_gtk_widget_get_parent (child) == widget);
   g_return_if_fail (snapshot != NULL);
 
+  if (GTK_IS_NATIVE (child))
+    return;
+
   gtk_snapshot_save (snapshot);
   gtk_snapshot_transform (snapshot, priv->transform);