Update codeOffset/codeLength during incremental 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 analyzer.src.generated.incremental_resolver;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 2069 matching lines @@
         (element as ElementImpl).nameOffset = nameOffset + updateDelta;
       }
       if (element is ConstVariableElement) {
         ConstVariableElement constVariable = element as ConstVariableElement;
         Expression initializer = constVariable.constantInitializer;
         if (initializer != null) {
           _shiftTokens(initializer.beginToken);
         }
       }
     }
+    // code range
+    if (element is ElementImpl) {
+      int oldOffset = element.codeOffset;
+      int oldLength = element.codeLength;
+      if (oldOffset != null) {
+        int newOffset = oldOffset;
+        int newLength = oldLength;
+        newOffset += oldOffset > updateOffset ? updateDelta : 0;
+        if (oldOffset <= updateOffset && updateOffset < oldOffset + oldLength) {
+          newLength += updateDelta;
+        }
+        if (newOffset != oldOffset || newLength != oldLength) {
+          element.setCodeRange(newOffset, newLength);
+        }
+      }
+    }
     // visible range
     if (element is LocalElement) {
       SourceRange visibleRange = element.visibleRange;
       if (visibleRange != null) {
         int oldOffset = visibleRange.offset;
         int oldLength = visibleRange.length;
         int newOffset = oldOffset;
         int newLength = oldLength;
         newOffset += oldOffset > updateOffset ? updateDelta : 0;
         newLength += visibleRange.contains(updateOffset) ? updateDelta : 0;
@@ skipping 102 matching lines @@
   @override
   String toString() => name;
 }
 
 class _TokenPair {
   final _TokenDifferenceKind kind;
   final Token oldToken;
   final Token newToken;
   _TokenPair(this.kind, this.oldToken, this.newToken);
 }