widget: Be more careful with roots

We were assuming that all roots are windows,
and calling GtkWindow apis on them.

diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 6ca66ade93a1fb10a4afdc074801557501e9f5be..3d40eee3d1e34b72af9772aaa9c243baeb798f21 100644 (file)
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -3298,9 +3298,8 @@ update_cursor_on_state_change (GtkWidget *widget)
   GtkRoot *root;
 
   root = _gtk_widget_get_root (widget);
-  if (root)
-    gtk_window_update_pointer_focus_on_state_change (GTK_WINDOW (root),
-                                                     widget);
+  if (GTK_IS_WINDOW (root))
+    gtk_window_update_pointer_focus_on_state_change (GTK_WINDOW (root), widget);
 }
 
 /**