Add assist to reparent Flutter widget

pkg/analysis_server/lib/src/services/correction/assist.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 services.correction.assist;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/assist/assist_core.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
@@ skipping 101 matching lines @@
   static const INTRODUCE_LOCAL_CAST_TYPE = const AssistKind(
       'INTRODUCE_LOCAL_CAST_TYPE', 30, "Introduce new local with tested type");
   static const INVERT_IF_STATEMENT =
       const AssistKind('INVERT_IF_STATEMENT', 30, "Invert 'if' statement");
   static const JOIN_IF_WITH_INNER = const AssistKind('JOIN_IF_WITH_INNER', 30,
       "Join 'if' statement with inner 'if' statement");
   static const JOIN_IF_WITH_OUTER = const AssistKind('JOIN_IF_WITH_OUTER', 30,
       "Join 'if' statement with outer 'if' statement");
   static const JOIN_VARIABLE_DECLARATION = const AssistKind(
       'JOIN_VARIABLE_DECLARATION', 30, "Join variable declaration");
+  static const REPARENT_FLUTTER_WIDGET = const AssistKind(
+      "REPARENT_FLUTTER_WIDGET", 30, "Wrap new-expression with new widget");
   static const REMOVE_TYPE_ANNOTATION =
       const AssistKind('REMOVE_TYPE_ANNOTATION', 29, "Remove type annotation");
   static const REPLACE_CONDITIONAL_WITH_IF_ELSE = const AssistKind(
       'REPLACE_CONDITIONAL_WITH_IF_ELSE',
       30,
       "Replace conditional with 'if-else'");
   static const REPLACE_IF_ELSE_WITH_CONDITIONAL = const AssistKind(
       'REPLACE_IF_ELSE_WITH_CONDITIONAL',
       30,
       "Replace 'if-else' with conditional ('c ? x : y')");
@@ skipping 11 matching lines @@
       const AssistKind('SURROUND_WITH_FOR_IN', 30, "Surround with 'for-in'");
   static const SURROUND_WITH_IF =
       const AssistKind('SURROUND_WITH_IF', 30, "Surround with 'if'");
   static const SURROUND_WITH_TRY_CATCH = const AssistKind(
       'SURROUND_WITH_TRY_CATCH', 30, "Surround with 'try-catch'");
   static const SURROUND_WITH_TRY_FINALLY = const AssistKind(
       'SURROUND_WITH_TRY_FINALLY', 30, "Surround with 'try-finally'");
   static const SURROUND_WITH_WHILE =
       const AssistKind('SURROUND_WITH_WHILE', 30, "Surround with 'while'");
 }