* changes: Wrap up the stable ID refactor. Re-enable sorting in the DirectoryFragment. Fix file deletion after the move to Model IDs. Transition selection to use Model IDs. Switch DirectoryFragment code to use model IDs.
* changes: Wrap up the stable ID refactor. Re-enable sorting in the DirectoryFragment. Fix file deletion after the move to Model IDs. Transition selection to use Model IDs. Switch DirectoryFragment code to use model IDs.