code: def finalize(self):
          
          self._comboboxListView.removeEventFilter(self)
          self.comboBox.model().rowsInserted.disconnect(self.comboBoxRowsInserted)
          self.comboBox.activated.disconnect(self.comboBoxActivated)
          super(ChoiceCtiEditor, self).finalize()
docs: Is called when the editor is closed. Disconnect signals.