It concludes that an input version has been deleted when an ancestor entry
is present, only one A or B entry is present, and an output entry is present.
If nil: In such circumstances, the A or B file that is present will be
It concludes that an input version has been deleted when an ancestor entry
is present, only one A or B entry is present, and an output entry is present.
If nil: In such circumstances, the A or B file that is present will be