Add fixes for more lints

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.
 
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/src/services/correction/fix_internal.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/error/codes.dart';
@@ skipping 210 matching lines @@
       "Replace the '.' with a '?.' in the invocation");
   static const REPLACE_WITH_TEAR_OFF = const FixKind(
       'REPLACE_WITH_TEAR_OFF', 50, "Replace function literal with tear-off");
   static const USE_CONST = const FixKind('USE_CONST', 50, "Change to constant");
   static const USE_EFFECTIVE_INTEGER_DIVISION = const FixKind(
       'USE_EFFECTIVE_INTEGER_DIVISION',
       50,
       "Use effective integer division ~/");
   static const USE_EQ_EQ_NULL =
       const FixKind('USE_EQ_EQ_NULL', 50, "Use == null instead of 'is Null'");
+  static const USE_IS_NOT_EMPTY = const FixKind(
+      'USE_NOT_EMPTY', 50, "Use x.isNotEmpty instead of '!x.isEmpty'");
   static const USE_NOT_EQ_NULL =
       const FixKind('USE_NOT_EQ_NULL', 50, "Use != null instead of 'is! Null'");
 }
 
 /**
  * The implementation of [FixContext].
  */
 class FixContextImpl implements FixContext {
   @override
   final ResourceProvider resourceProvider;
 
   @override
   final AnalysisDriver analysisDriver;
 
   @override
   final AnalysisError error;
 
   FixContextImpl(this.resourceProvider, this.analysisDriver, this.error);
 
   FixContextImpl.from(FixContext other)
       : resourceProvider = other.resourceProvider,
         analysisDriver = other.analysisDriver,
         error = other.error;
 }