From Stephan Huber, "* osgGA: fixed a small bug regarding emulating mouse-events from touch-events

* resthttp/osc: encapsulate RequestHandler-classes in their own namespaces to prevent class-name-lookup-errors in the debugger/code (had some weird crashes)
* QTKit: fixed a compile-bug for gcc and blocks
* osgPresentation: click_to_* will fire on RELEASE, only if the drawable received a PUSH beforehand
* p3d/osgPresentation: implemented "forward_mouse_event_to_device"-tag, which will forward mouse-events to all registered devices of a viewer, if an intersection occurs. The mouse-coordinates get reprojected
* present3d: all devices get registered with the viewer
* osgViewer: only devices which are capable of receiving events are queried for new events.
* GraphicWindowIOS: added a flag to GraphicWindowIOS::WindowData to set up a retained backing buffer (defaults to false) This will enable read-back of the render-buffer with glReadPixels even after the renderbuffer got presented
* curl: added an optimized check for file-existance, now only the headers are requested and checked, instead of reading the whole file and handle it with a ReaderWriter
* p3d: fixed a bug, where the existence of a local file may prevent the remote loading of a file with the same name.

"

src/osgViewer/Viewer.cpp

@@ -651,7 +651,8 @@ void Viewer::eventTraversal()
         ++eitr)
     {
         osgGA::Device* es = eitr->get();
-        es->checkEvents();
+        if (es->getCapabilities() & osgGA::Device::RECEIVE_EVENTS)
+            es->checkEvents();
 
         // open question, will we need to reproject mouse coordinates into current view's coordinate frame as is down for GraphicsWindow provided events?
         // for now assume now and just get the events directly without any reprojection.