MirrorPropertyTree websocket fixes

- deal with ‘NONE’ properties correctly
- use a better method to send the initial tree on connection.

src/Network/http/MirrorPropertyTreeWebsocket.cxx

@@ -44,7 +44,7 @@ using std::string;
     struct PropertyValue
     {
         PropertyValue(SGPropertyNode* cur = nullptr) :
-            type(simgear::props::UNSPECIFIED)
+            type(simgear::props::NONE)
         {
             if (!cur) {
                 return;
@@ -70,8 +70,11 @@ using std::string;
                 stringValue = cur->getStringValue();
                 break;
 
+            case simgear::props::NONE:
+                break;
+
             default:
-                SG_LOG(SG_NETWORK, SG_INFO, "implement me!");
+                SG_LOG(SG_NETWORK, SG_INFO, "implement me!" << type);
                 break;
             }
         }
@@ -92,6 +95,9 @@ using std::string;
             case simgear::props::UNSPECIFIED:
                 return stringValue == other.stringValue;
 
+            case simgear::props::NONE:
+                return true;
+
             default:
                 break;
             }
@@ -146,6 +152,19 @@ using std::string;
             removedNodes.insert(idForProperty(child));
         }
 
+        void registerSubtree(SGPropertyNode* node)
+        {
+            if (node->getType() != simgear::props::NONE) {
+                valueChanged(node);
+            }
+
+            // and recurse
+            int child = 0;
+            for (; child < node->nChildren(); ++child) {
+                registerSubtree(node->getChild(child));
+            }
+        }
+
         std::set<SGPropertyNode*> newNodes;
         std::set<SGPropertyNode*> changedNodes;
         std::set<PropertyId> removedNodes;
@@ -281,7 +300,7 @@ MirrorPropertyTreeWebsocket::MirrorPropertyTreeWebsocket(const std::string& path
 {
     _subtreeRoot = globals->get_props()->getNode(path, true);
     _subtreeRoot->addChangeListener(_listener.get());
-    _subtreeRoot->fireCreatedRecursive();
+    _listener->registerSubtree(_subtreeRoot);
 }
 
 MirrorPropertyTreeWebsocket::~MirrorPropertyTreeWebsocket()