It doesn't make any difference as -
1. The sort order shown our SortedNotesFolder is different
2. Rebuilds of the tree affect everything. Even the elements which
should be in the correct place.
This is just for optimizing the loading of the Notes in the correct
order. I want to avoid the notes appearing and disappearing in a strange
order when loading. It gives a bad first impression.
This cache isn't integrated, it's only half done.
