If analysis is already complete, don't start it again in onFileAnalysisComplete().

pkg/analysis_server/lib/src/analysis_server.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core' hide Resource;
 import 'dart:math' show max;
@@ skipping 739 matching lines @@
    *
    * 2. We should complete the future as soon as the file is analyzed (not wait
    *    until the context is completely finished)
    */
   Future<AnalysisDoneReason> onFileAnalysisComplete(String file) {
     // prepare AnalysisContext
     AnalysisContext context = getAnalysisContext(file);
     if (context == null) {
       return null;
     }
+    // done if everything is already analyzed
+    if (isAnalysisComplete()) {
+      return new Future.value(AnalysisDoneReason.COMPLETE);
+    }
     // schedule context analysis
     schedulePerformAnalysisOperation(context);
     // associate with the context completer
     Completer<AnalysisDoneReason> completer =
         contextAnalysisDoneCompleters[context];
     if (completer == null) {
       completer = new Completer<AnalysisDoneReason>();
       contextAnalysisDoneCompleters[context] = completer;
     }
     return completer.future;
@@ skipping 870 matching lines @@
   /**
    * The [PerformanceTag] for time spent in server request handlers.
    */
   static PerformanceTag serverRequests = new PerformanceTag('serverRequests');
 
   /**
    * The [PerformanceTag] for time spent in split store microtasks.
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }