This allows QuickWindowNodeInstance to return the content item
instead.
The function parentObject() in ObjectNodeInstance now knows
QQuickRootItem, because the parent of the root item should
is the windows (which is just a QObject but treated as item from us).
Change-Id: Ibaa7ccc8dd9346689cc4443ce0b594056feaa0cf
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
