[gtk+] widget: Avoid some type checks when invalidating window

[Timm Bäder <baedert src gnome org>]

commit eee335557c0e4043edd53e8c33ccc23de3dd19ef
Author: Timm Bäder <mail baedert org>
Date:   Sat Oct 14 07:25:19 2017 +0200

    widget: Avoid some type checks when invalidating window
    
    Use the private _gtk_widget_get_has_window instead of the public version

 gtk/gtkwidget.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 8ef04bb..1968ce4 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -5267,7 +5267,7 @@ gtk_widget_queue_draw_region (GtkWidget            *widget,
 
   /* Look for the parent with a window and invalidate @region in there. */
   parent = widget;
-  while (parent != NULL && !gtk_widget_get_has_window (parent))
+  while (parent != NULL && !_gtk_widget_get_has_window (parent))
     parent = _gtk_widget_get_parent (parent);
 
   g_assert (parent != NULL);