How to reproduce:
- empty repository
- create a `File` document with a 6611 bytes file (screenshot-1)
- create 2 versions of the `File` document previously created (screenshot-2)
- delete the `File` (move to trash) (screenshot-3)
- create another `File` document with a 53531 bytes file (screenshot-4)
Live documents size should be 53531 bytes but it is not because versions' size was added to trash size.
So when a document is moved to the trash, only its inner size should be moved to its trash size, not its total size.
Live document size computation should follow the following formula: