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Because of the asynchronous nature of the formeditor the item can be between
to states. This looks like the item is hoping around. To prevent this a token
is sent to the instances and back. For the time frame the painting is disabled.

Change-Id: If7e937cba8171248464ad350bb14438c020b25f9
Reviewed-on: http://codereview.qt.nokia.com/1189

Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>