On a debug break, inspector tools cannot be used as the
gui thread is blocked.

Task-number: QTCREATORBUG-5466
Change-Id: I808d751b1ade7e4a5c98e87fec7bb4cb02715ad8
Reviewed-by: Christiaan Janssen <christiaan.janssen@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>