Reset analysis driver after incremental changes.

pkg/analyzer/lib/src/context/context.dart

 // Copyright (c) 2015, 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 analyzer.src.context.context;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1993 matching lines @@
       // prepare notice
       {
         ChangeNoticeImpl notice = getNotice(unitSource);
         notice.resolvedDartUnit = oldUnit;
         AnalysisErrorInfo errorInfo = getErrors(unitSource);
         notice.setErrors(errorInfo.errors, errorInfo.lineInfo);
       }
       // schedule
       dartWorkManager.unitIncrementallyResolved(librarySource, unitSource);
       // OK
+      driver.reset();
       return true;
     });
   }
 }
 
 /**
  * A helper class used to create futures for [AnalysisContextImpl].
  * Using a helper class allows us to preserve the generic parameter T.
  */
 class AnalysisFutureHelper<T> {
@@ skipping 270 matching lines @@
     }
     DartSdk sdk = factory.dartSdk;
     if (sdk == null) {
       throw new IllegalArgumentException(
           "The source factory for an SDK analysis context must have a DartUriResolver");
     }
     return new AnalysisCache(
         <CachePartition>[AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
   }
 }