A useful teaching framework is:
1. Fruit has not yet appeared: outside the quoted rule on existing fruit.
2. Existing fruit is unripe but presently useful and stipulated to be cut: broad acceptance is reported.
3. Existing unripe fruit is sold without a condition: a well-known disagreement separates Hanafi and majority positions.
4. The contract requires the fruit to remain attached: Quduri rules the sale defective.
This is a teaching overview, not an exhaustive treatment of every jurist's qualification.