public T getCurrentHistoryItem() {
		if (historyStack.isEmpty()) {
			return null;
		}
		return historyStack.get(historyIndex);
	}
Returns the item currently pointed to within the list of items.  When an item is 
added, this will be that item.  Otherwise, it will be the last item navigated.

@return the item currently pointed to within the list of items.
Ghidra/Framework/Generic/src/main/java/util/HistoryList.java