Issue 25657. Update offsets of cloned constant initializers.

pkg/analyzer/test/generated/incremental_resolver_test.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.test.generated.incremental_resolver_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
@@ skipping 4526 matching lines @@
   _foo() {
     print(12);
   }
 }
 ''');
     // no hints
     List<AnalysisError> errors = analysisContext.getErrors(source).errors;
     expect(errors, isEmpty);
   }
 
+  void test_updateConstantInitializer() {
+    _resolveUnit(r'''
+main() {
+  const v = const [Unknown];
+}
+''');
+    _updateAndValidate(r'''
+main() {
+   const v = const [Unknown];
+}
+''');
+  }
+
   void test_updateErrors_addNew_hint1() {
     _resolveUnit(r'''
 int main() {
   return 42;
 }
 ''');
     _updateAndValidate(r'''
 int main() {
 }
 ''');
@@ skipping 622 matching lines @@
   @override
   void logException(Object exception, [Object stackTrace]) {
     hasError = true;
   }
 
   @override
   logging.LoggingTimer startTimer() {
     return new logging.LoggingTimer(this);
   }
 }