Hack a fix for listener overflows.

Maybe it has something to do with Java 8 differences?
Or maybe I just changed something while working on SKM
that is horking things up when working with (old style)
SK configs.

This'll do for now, but I'll surely have to revisit when clyde gets
the love it needs.

core/src/main/java/com/threerings/config/ManagedConfig.java

@@ -367,16 +367,26 @@ protected void getUpdateResources (HashSet<String> paths)
      */
     protected void fireConfigUpdated ()
     {
-        if (_listeners != null) {
-            final ConfigEvent<ManagedConfig> event = new ConfigEvent<ManagedConfig>(this, this);
-            _listeners.apply(new ObserverList.ObserverOp<ConfigUpdateListener<ManagedConfig>>() {
-                public boolean apply (ConfigUpdateListener<ManagedConfig> listener) {
-                    listener.configUpdated(event);
-                    return true;
-                }
-            });
+        // TODO: Remove need for _firing kludge?!?!
+        if (_firing) {
+            return;
+        }
+        _firing = true;
+        try {
+            if (_listeners != null) {
+                final ConfigEvent<ManagedConfig> event = new ConfigEvent<ManagedConfig>(this, this);
+                _listeners.apply(new ObserverList.ObserverOp<ConfigUpdateListener<ManagedConfig>>() {
+                    public boolean apply (ConfigUpdateListener<ManagedConfig> listener) {
+                        listener.configUpdated(event);
+                        return true;
+                    }
+                });
+            }
+            maybeFireOnConfigManager();
+
+        } finally {
+           _firing =false;
         }
-        maybeFireOnConfigManager();
     }
 
     /**
@@ -451,6 +461,11 @@ protected void clearUpdateDependencies ()
     @DeepOmit
     protected transient WeakObserverList<ConfigUpdateListener<ManagedConfig>> _listeners;
 
+    /** Are we firing our event right now? */
+    // TODO: Remove! Kludge.
+    @DeepOmit
+    protected transient boolean _firing;
+
     /** The list of configs to which we are listening for updates.
      * This is usually null and is typically only used when the client creates a DConfigDirector,
      * in dev environments. */