Disabled mouse-based throwing movement of camera in 3D view.

src/ui/map3D/GCManipulator.cc

@@ -74,8 +74,8 @@ GCManipulator::handle(const osgGA::GUIEventAdapter& ea,
             if (isMouseMoving()) {
                 if (calcMovement()) {
                     us.requestRedraw();
-                    us.requestContinuousUpdate(true);
-                    _thrown = true;
+                    us.requestContinuousUpdate(false);
+                    _thrown = false;
                 }
             } else {
                 flushMouseEventStack();