* using this function, GTK+ will do its best to convince the window
* manager not to decorate the window. Depending on the system, this
* function may not have any effect when called on a window that is
* using this function, GTK+ will do its best to convince the window
* manager not to decorate the window. Depending on the system, this
* function may not have any effect when called on a window that is
* _gtk_window_set_is_toplevel:
* @window: a #GtkWindow
* @is_toplevel: %TRUE if the window is still a real toplevel (nominally a
* _gtk_window_set_is_toplevel:
* @window: a #GtkWindow
* @is_toplevel: %TRUE if the window is still a real toplevel (nominally a
* in-process, parented GtkPlug)
*
* Internal function used by #GtkPlug when it gets parented/unparented by a
* in-process, parented GtkPlug)
*
* Internal function used by #GtkPlug when it gets parented/unparented by a