It seems that in cases of grouped and attached properties we don't want to create a new scope every time, but instead reuse the created one, falling back to create if the scope doesn't exist Consider: ```qml QtObject { myGroup.property1: 42 // case 1 myGroup.property2: "hello" // case 2 MyAttached.property1: 42 // case 3 MyAttached.property2: "hello" // case 4 } ``` The intuition tells that cases 1 and 2 should use the same shared scope "myGroup" and so should cases 3 and 4 both use the same "MyAttached". Creating a new scope each time for attached and grouped properties seems erroneous As a drive-by, add attached property type to tst_qmllint and test that this still works after the changes to the related code Change-Id: Ib1ae85b404a7954a3a3211cbd267c414b98ac59d Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io> Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>