func (v *Screen) GetActiveWindow() (*Window, error) {
	return toWindow(C.gdk_screen_get_active_window(v.native()))
}
func (v *Screen) GetActiveWindow() (*Window, error) {
	return toWindow(C.gdk_screen_get_active_window(v.native()))
}
// GetActiveWindow is a wrapper around gdk_screen_get_active_window().