Don't emit attached add() and remove() for moved items

Regression from 6fbc4b7e

Change-Id: I0bcd55548dca1559deea0d66112e7cdeb3da4ed9
Reviewed-on: http://codereview.qt.nokia.com/4023


Reviewed-by: Bea Lam <bea.lam@nokia.com>
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>