def METHOD_NAME(self, event):
    """Reimplemented."""
    self._popup_is_shown = False
    super(MultiSelectionComboBox, self).METHOD_NAME(event)
    if self._popup_is_shown:
        self._initial_mouse_pos = self.mapToGlobal(event.pos())
        self._block_mouse_release_timer.start(
            QtWidgets.QApplication.doubleClickInterval()
        )