Update errors offsets during incremental comment resolution.

pkg/analyzer/lib/src/generated/incremental_resolver.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 engine.incremental_resolver;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'ast.dart';
@@ skipping 1371 matching lines @@
     _setPrecedingComments(oldToken, newComment.tokens.first);
     // replace node
     NodeReplacer.replace(oldComment, newComment);
     // update elements
     IncrementalResolver incrementalResolver = new IncrementalResolver(
         _unitElement,
         _updateOffset,
         _updateEndOld,
         _updateEndNew);
     incrementalResolver._updateElementNameOffsets();
+    incrementalResolver._shiftEntryErrors();
     _updateEntry();
     // resolve references in the comment
     incrementalResolver._resolveReferences(newComment);
     // OK
     return true;
   }
 
   Token _scan(String code) {
     RecordingErrorListener errorListener = new RecordingErrorListener();
     CharSequenceReader reader = new CharSequenceReader(code);
@@ skipping 424 matching lines @@
   String toString() => name;
 }
 
 
 class _TokenPair {
   final _TokenDifferenceKind kind;
   final Token oldToken;
   final Token newToken;
   _TokenPair(this.kind, this.oldToken, this.newToken);
 }