Reset: DeletionManager can be uninstalled

simgear/scene/util/DeletionManager.cxx

@@ -45,6 +45,11 @@ void DeletionManager::addStaleObject(Referenced* obj)
     _staleObjects.push_back(obj);
 }
 
+void DeletionManager::uninstall(Node* node)
+{
+    node->removeEventCallback(instance());
+}
+
 void DeletionManager::install(Node* node)
 {
     node->addEventCallback(instance());

simgear/scene/util/DeletionManager.hxx

@@ -38,6 +38,7 @@ public:
                         osg::Object* object, osg::NodeVisitor* nv);
     void addStaleObject(osg::Referenced* obj);
     static void install(osg::Node* node);
+    static void uninstall(osg::Node* node);
     static DeletionManager* instance();
 protected:
     OpenThreads::Mutex _mutex;