code: func FileChooserWidgetNew(action FileChooserAction) (*FileChooserWidget, error) {
  	c := C.gtk_file_chooser_widget_new((C.GtkFileChooserAction)(action))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	obj := glib.Take(unsafe.Pointer(c))
  	return wrapFileChooserWidget(obj), nil
  }
docs: // FileChooserWidgetNew is a wrapper around gtk_file_chooser_widget_new().