451 fq childRes visible group free exceeds child free

autotest-case: 451 scope: group freeQuantity; childRes=True group: fq.451 childRes visible group free 3 child free only A group restrictions: min=2 max=3 free=3 children: prices=[30, 20, 10] defaults=[1, 1, 0] childMin=[1, 1, 0] childFree=[1, 0, 0] manual hide group: - manual hide child modifiers: [] expected: quick add chooses the most expensive eligible defaults as free; group free is the cap, and child free can additionally limit a child when childRes=true.