Call DesignerSupport::updateDirtyNode() recursively for every item which is
not under our control.

Change-Id: Ie6c784965d1557ece81176fc405864f1328733f7
Reviewed-on: http://codereview.qt.nokia.com/3972


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>