Nested cursor-based pagination doesn't work as intended

[dpetrick]

Nested pagination fails to return the correct data for all parents when using a cursor. Assume the following record layout:

P1

• C1
• C2
• C3

P2

• C4
• C5
• C6

P3

• C7
• C8
• C9

Setting a cursor on C5 with a query like:

findManyP(...) { C(cursor: { id: "C5" }) ... })

The expected data (because the cursor only applies to P2) of the query above would be:

P1 { <no Cs> }
P2 { C5, C6 }
P3 { <no Cs> }

However, due to the way we currently resolve nested records together with nested pagination, we return:

P1 { <no Cs> }
P2 { C5, C6 }
P3 { C7, C8, C9 }