Implementing clone() is apparently "required" for subclasses of Event.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4163 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/events/ControllerEvent.as

@@ -17,6 +17,11 @@ public class ControllerEvent extends Event
         this.arg = arg;
     }
 
+    public override function clone () :Event
+    {
+        return new ControllerEvent(command, arg);
+    }
+
     public override function toString () :String
     {
         return "ControllerEvent[" + command + " (" + arg + ")]";