docs: def _notify(self, task, message):
          """ Shows system notification message according to system requirements.
  
              `message`
                  Status message.
              """
  
          if self.notify_func:
              message = common.to_utf8(message.strip())
              title = common.to_utf8(u'Focus ({0})'.format(task.name))
              self.notify_func(title, message)