code: def _show_feedback_label(self, message, seconds=None):
          
          if seconds is None:
              seconds = CONFIG['MESSAGE_DURATION']
  
          logger.debug('Label feedback: "{}"'.format(message))
  
          self.feedback_label_timer.timeout.connect(self._hide_feedback_label)
          self.lbl_feedback.setText(str(message))
          self.lbl_feedback.show()
          self.feedback_label_timer.start(1000 * seconds)
docs: Display a message in lbl_feedback, which times out after some
          number of seconds.