code: func (v *Stack) GetVisibleChild() *Widget {
  	c := C.gtk_stack_get_visible_child(v.native())
  	if c == nil {
  		return nil
  	}
  	return wrapWidget(glib.Take(unsafe.Pointer(c)))
  }
docs: // GetVisibleChild is a wrapper around gtk_stack_get_visible_child().