[Re-]connects all signals and slots.

        If already in "connected" state, ignores the call.

def connect_all(self):
        """[Re-]connects all signals and slots.

        If already in "connected" state, ignores the call.
        """
        if self.__connected:
            return  # assert not self.__connected, "connect_all() already in \"connected\" state"
        with self.__lock:
            for signal in self.__signals:
                self.__connect_signal(signal)
            if self.__slot is not None:
                self.__sigDelayed.connect(self.__slot, Qt.QueuedConnection)
            self.__connected = True