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kotlinlang

<@U0F3291QE> I pulled out the mainView.update() calls in my masterbranch and also replaced the cellFactory with cellCache.  TodoItemListCell is deprecated so that can be removed too

        lvItems.cellCache {
            model.readCache(it).root
        }

I'm delegating to a model function because I have the model cleaning up the cache.  If we don't care about a removed object's fragment remaining in the cache, we can decouple this.

If this looks good with you, I think the only thing left is to incorporate Ron's changes that replaced the .fxml with type safe builders.