I create a list with 5 items, I clear the list with List.clear(),
I add the 5 items back tot he list, and the display shows 6 items
where the first item is a duplciate of the last item. Similarly,
if I delete the last 2 items with delItems(3, 4) and add them back,
I end up with 6 items with the last item duplicated after the third
item.

This appears to be an off-by-one bug in the List peer code (my guess).
Unfortunately, I can't find a java-only workaround for this, other than
destroying the entire List object and recreating, which is not a pleasant
user interface experience.