[gtk/wip/baedert/for-master] mediastream demo: Add a weak pointer to the window

[Timm Bäder <baedert src gnome org>]

commit 74a0fe4c579c05be391fe141ade5edcc65f65948
Author: Timm Bäder <mail baedert org>
Date:   Sat Aug 1 08:07:43 2020 +0200

    mediastream demo: Add a weak pointer to the window
    
    Do what other demos do as well.
    
    Fixes 2983

 demos/gtk-demo/paintable_mediastream.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/demos/gtk-demo/paintable_mediastream.c b/demos/gtk-demo/paintable_mediastream.c
index f9c4c42ffe..022c156d8a 100644
--- a/demos/gtk-demo/paintable_mediastream.c
+++ b/demos/gtk-demo/paintable_mediastream.c
@@ -293,6 +293,7 @@ do_paintable_mediastream (GtkWidget *do_widget)
                               gtk_widget_get_display (do_widget));
       gtk_window_set_title (GTK_WINDOW (window), "Nuclear MediaStream");
       gtk_window_set_default_size (GTK_WINDOW (window), 300, 200);
+      g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
 
       nuclear = gtk_nuclear_media_stream_new ();
       gtk_media_stream_set_loop (GTK_MEDIA_STREAM (nuclear), TRUE);