From Arjun Ramamurthy, fix for StatsHandler when being used in multiple view/windows

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/branches/OpenSceneGraph-3.2@14710 16af8721-9629-0410-8352-f15c8da7e697

src/osgViewer/StatsHandler.cpp

@@ -326,6 +326,7 @@ void StatsHandler::setUpHUDCamera(osgViewer::ViewerBase* viewer)
 
     // only clear the depth buffer
     _camera->setClearMask(0);
+    _camera->setAllowEventFocus(false);
 
     _camera->setRenderer(new Renderer(_camera.get()));