gtk3-demo: Don't leak in the sizegroup example

Nobody was cleaning up the size group.
Pointed out in
https://bugzilla.gnome.org/show_bug.cgi?id=645966

diff --git a/demos/gtk-demo/sizegroup.c b/demos/gtk-demo/sizegroup.c
index c15b78b9386cadf72dbacd50e7054a41d1c91f1a..e38340195a6f0384831b119211022092fafa7c53 100644 (file)
--- a/demos/gtk-demo/sizegroup.c
+++ b/demos/gtk-demo/sizegroup.c
@@ -120,6 +120,7 @@ do_sizegroup (GtkWidget *do_widget)
       gtk_container_set_border_width (GTK_CONTAINER (vbox), 5);
 
       size_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
+      g_object_set_data_full (G_OBJECT (window), "size-group", size_group, g_object_unref);
 
       /* Create one frame holding color options */
       frame = gtk_frame_new ("Color Options");