code: def transient_change_detect(self, *class_build_args, **class_build_kwargs):
          
  
          transient_detected = set(self.get_transients_available())
          #TODO : unify that last_got_set with the *_available. they are essentially the same
          tst_gone = self.last_transients_detected - transient_detected
  
          # print("INTERFACING + {transient_detected}".format(**locals()))
          # print("INTERFACING - {tst_gone}".format(**locals()))
  
          dt = self.transient_change_diff(
              # we start interfacing with new matches,
              # but we also need to update old matches that match regex now
              transient_appeared=transient_detected,
              transient_gone=tst_gone,
              *class_build_args,
              **class_build_kwargs
          )
  
          self.last_transients_detected.update(transient_detected)
          if tst_gone:
              self.last_transients_detected.difference_update(tst_gone)
  
          return dt
docs: This should be called when we want to detect a change in the status of the system regarding the transient list
          This function also applies changes due to regex_set updates if needed
          _transient_change_detect -> _transient_change_diff -> _update_transients