[gtk] widget: Not all toplevels are containers

[Benjamin Otte <otte src gnome org>]

commit 2dd37e9624c9f9024f919b7ea411a414eb5661d3
Author: Benjamin Otte <otte redhat com>
Date:   Wed Apr 11 04:04:37 2018 +0200

    widget: Not all toplevels are containers
    
    Guard against GtkInvisible.

 gtk/gtkwidget.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 9bfbffa95e..8a96707b4b 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -3694,7 +3694,7 @@ gtk_widget_connect_frame_clock (GtkWidget *widget)
   GtkWidgetPrivate *priv = widget->priv;
   GdkFrameClock *frame_clock;
 
-  if (_gtk_widget_is_toplevel (widget))
+  if (GTK_IS_CONTAINER (widget) && _gtk_widget_is_toplevel (widget))
     gtk_container_start_idle_sizer (GTK_CONTAINER (widget));
 
   frame_clock = gtk_widget_get_frame_clock (widget);
@@ -3718,7 +3718,7 @@ gtk_widget_disconnect_frame_clock (GtkWidget *widget)
 {
   GtkWidgetPrivate *priv = widget->priv;
 
-  if (_gtk_widget_is_toplevel (widget))
+  if (GTK_IS_CONTAINER (widget) && _gtk_widget_is_toplevel (widget))
     gtk_container_stop_idle_sizer (GTK_CONTAINER (widget));
 
   gtk_css_node_invalidate_frame_clock (priv->cssnode, FALSE);