Mon Feb  2 04:15:08 1998  Tim Janik  <timj@gimp.org>

        * gtk/gtktoolbar.c: fixed destroy handler, so it doesn't
          segfault with the new refcounting scheme anymore.

        * gtk/gtkhandlebox.c:
        * gtk/gtkclist.c:
        * gtk/gtkentry.c:
        * gtk/gtkrange.c:
        * gtk/gtktext.c:
        * gtk/gtkviewport.c:
          enforced
          gdk_window_set_user_data (window, NULL);
          gdk_window_destroy (window);
          window = NULL;
          throughout the code.