Add quick-fix to convert child: to children:

pkg/analysis_server/lib/src/services/correction/fix.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 analysis_server.src.services.correction.fix;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
@@ skipping 87 matching lines @@
     errorCode == ParserErrorCode.GETTER_WITH_PARAMETERS ||
     errorCode == ParserErrorCode.VAR_AS_TYPE_NAME ||
     errorCode == StaticTypeWarningCode.ILLEGAL_ASYNC_RETURN_TYPE ||
     errorCode == StaticTypeWarningCode.INSTANCE_ACCESS_TO_STATIC_MEMBER ||
     errorCode == StaticTypeWarningCode.INVOCATION_OF_NON_FUNCTION ||
     errorCode == StaticTypeWarningCode.NON_TYPE_AS_TYPE_ARGUMENT ||
     errorCode == StaticTypeWarningCode.UNDEFINED_FUNCTION ||
     errorCode == StaticTypeWarningCode.UNDEFINED_GETTER ||
     errorCode == StaticTypeWarningCode.UNDEFINED_METHOD ||
     errorCode == StaticTypeWarningCode.UNDEFINED_SETTER ||
+    errorCode == CompileTimeErrorCode.UNDEFINED_NAMED_PARAMETER ||
     (errorCode is LintCode &&
         (errorCode.name == LintNames.annotate_overrides ||
             errorCode.name == LintNames.unnecessary_brace_in_string_interp));
 
 /**
  * An enumeration of possible quick fix kinds.
  */
 class DartFixKind {
   static const ADD_ASYNC =
       const FixKind('ADD_ASYNC', 50, "Add 'async' modifier");
@@ skipping 12 matching lines @@
       'ADD_PACKAGE_DEPENDENCY', 50, "Add dependency on package '{0}'");
   static const ADD_SUPER_CONSTRUCTOR_INVOCATION = const FixKind(
       'ADD_SUPER_CONSTRUCTOR_INVOCATION',
       50,
       "Add super constructor {0} invocation");
   static const CHANGE_TO = const FixKind('CHANGE_TO', 49, "Change to '{0}'");
   static const CHANGE_TO_STATIC_ACCESS = const FixKind(
       'CHANGE_TO_STATIC_ACCESS', 50, "Change access to static using '{0}'");
   static const CHANGE_TYPE_ANNOTATION = const FixKind(
       'CHANGE_TYPE_ANNOTATION', 50, "Change '{0}' to '{1}' type annotation");
+  static const CONVERT_FLUTTER_CHILD =
+      const FixKind('CONVERT_FLUTTER_CHILD', 50, "Convert to children:");
   static const CREATE_CLASS =
       const FixKind('CREATE_CLASS', 50, "Create class '{0}'");
   static const CREATE_CONSTRUCTOR =
       const FixKind('CREATE_CONSTRUCTOR', 50, "Create constructor '{0}'");
   static const CREATE_CONSTRUCTOR_FOR_FINAL_FIELDS = const FixKind(
       'CREATE_CONSTRUCTOR_FOR_FINAL_FIELDS',
       50,
       "Create constructor for final fields");
   static const CREATE_CONSTRUCTOR_SUPER = const FixKind(
       'CREATE_CONSTRUCTOR_SUPER', 50, "Create constructor to call {0}");
@@ skipping 93 matching lines @@
   @override
   final AnalysisError error;
 
   FixContextImpl(this.resourceProvider, this.analysisContext, this.error);
 
   FixContextImpl.from(FixContext other)
       : resourceProvider = other.resourceProvider,
         analysisContext = other.analysisContext,
         error = other.error;
 }