code: def examine(self):
          
          if self._changes:
              return self._changes.pop()
  
          action_file = None
          if self._changed:
              self._changed = False
              action_file = self._action_file or True  # TODO: Hack (see above)
          return action_file, None
docs: Called by LiveReloadHandler's poll_tasks method.
  
          If a boolean true value is returned, then the waiters (browsers) are
          reloaded.