code: def process_IN_IGNORED(self, raw_event):
          
          event_ = self.process_default(raw_event)
          self._watch_manager.del_watch(raw_event.wd)
          return event_
docs: The watch descriptor raised by this event is now ignored (forever),
          it can be safely deleted from the watch manager dictionary.
          After this event we can be sure that neither the event queue nor
          the system will raise an event associated to this wd again.