Fix [541]: viewportDestroyed were never called
Fix [541]: viewportDestroyed were never called

paroj/ogre,paroj/ogre,RealityFactory/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre,paroj/ogre,RealityFactory/ogre,OGRECave/ogre,OGRECave/ogre,RealityFactory/ogre,RealityFactory/ogre,RealityFactory/ogre,OGRECave/ogre,OGRECave/ogre