Method HandleCargoWaitingClick

src/station_gui.cpp:1924–1931

	 */
	template <class Tid>
	void HandleCargoWaitingClick(CargoDataEntry *filter, Tid next)
	{
		if (filter->Retrieve(next) != nullptr) {
			filter->Remove(next);
		} else {
			filter->InsertOrRetrieve(next);
		}
	}

	/**
	 * Handle a click on a specific row in the cargo view.