Add files in QtC work incorrectly when files property set in parent

1. Open attached project, test.qbs in QtC.
2. add cpp file (or class) to 'product2'
3. you notice that in first product 'files' property appears, and file appears in both products.
EXPECTED: no changes to qbs files, only qbs reparse. Added file already matches '*.cpp' mask.

EXPECTED 2: if i try to add file in product that won't appear in list (e.g. *qrc) in test project, it should show error.