QGraphicsItem::clearFocus() doesn't clear focus from a FocusScope

This makes it impossible to remove focus from a QtQuick FocusScope with children using the focus property. In the example below, 'focusScope.focus = false' will do nothing instead of clearing the focus scope's focus and both items active focus.

 
FocusScope {
    id: focusScope
    focus: true

    Item {
        id: item
        focus: true
    }
}