Reimplements the :meth:`QTabWidget.dropEvent` method.

        :param event: QEvent.
        :type event: QEvent

def dropEvent(self, event):
        """
        Reimplements the :meth:`QTabWidget.dropEvent` method.

        :param event: QEvent.
        :type event: QEvent
        """

        LOGGER.debug("> '{0}' widget drop event accepted!".format(self.__class__.__name__))
        self.content_dropped.emit(event)