[gtk+] gtk-demo: No need to gdk_flush() here

[Benjamin Otte <otte src gnome org>]

commit 8d7d5343d805158dea050e063c0ba329e8ebc85e
Author: Benjamin Otte <otte redhat com>
Date:   Fri Nov 17 08:34:57 2017 +0100

    gtk-demo: No need to gdk_flush() here
    
    And if there was a need, GDK should have done it.

 demos/gtk-demo/changedisplay.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/demos/gtk-demo/changedisplay.c b/demos/gtk-demo/changedisplay.c
index fc79ac8..ec0849b 100644
--- a/demos/gtk-demo/changedisplay.c
+++ b/demos/gtk-demo/changedisplay.c
@@ -150,7 +150,6 @@ query_for_toplevel (GdkDisplay *display,
 
   g_object_unref (cursor);
   gtk_widget_destroy (popup);
-  gdk_flush ();                 /* Really release the grab */
 
   return toplevel;
 }