qmllint should warn about assigning to readonly property

For code bellow git dev (cf00dd59d16005d0511c43b3b7ca15e43612b9f6) qmllint reports no warnings. But activeFocus is readonly property, so any form of assign to it is mistake.

import QtQuick 2.15

Item {
        id: foo
        activeFocus: true
        Component.onCompleted: {
                foo.activeFocus = true; 
        }
}