public List<T> getPreviousHistoryItems() {

		List<T> list = new ArrayList<>();
		for (int i = historyIndex - 1; i >= 0; i--) {
			list.add(historyStack.get(i));
		}
		return list;
	}
Get all items in the history that come before the current history item.  They are 
returned in navigation order, as traversed if {@link #goBack()} is called.

@return the items
Ghidra/Framework/Generic/src/main/java/util/HistoryList.java