413901 isAsyncStarted remains true while original request is dispatched

jetty-server/src/main/java/org/eclipse/jetty/server/HttpChannelState.java

@@ -574,6 +574,8 @@ public class HttpChannelState
     {
         synchronized (this)
         {    
+            if (_state==State.DISPATCHED)
+                return _async!=null;
             return _async==Async.STARTED || _async==Async.EXPIRING;
         }
     }

jetty-servlets/src/main/java/org/eclipse/jetty/servlets/GzipFilter.java

@@ -352,7 +352,6 @@ public class GzipFilter extends UserAgentFilter
         {
             if (request.isAsyncStarted())
             {
-                 
                 request.getAsyncContext().addListener(new FinishOnCompleteListener(wrappedResponse));
             }
             else if (exceptional && !response.isCommitted())