private void broadcast(T t, T leaving) {
		try {
			isBroadcasting = true;
			itemSelectedCallback.accept(t, leaving);
		}
		finally {
			isBroadcasting = false;
		}
	}
Returns the number of items in this history list

@return the number of items in this history list
Ghidra/Framework/Generic/src/main/java/util/HistoryList.java