Keep directive annotations while sorting.

pkg/analysis_server/test/edit/sort_members_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 test.edit.sort_members;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/edit/edit_domain.dart';
@@ skipping 126 matching lines @@
 export 'bbb/bbb.dart';
 
 part 'aaa/aaa.dart';
 part 'bbb/bbb.dart';
 
 main() {
 }
 ''');
   }
 
+  test_OK_directives_withAnnotation() async {
+    addTestFile('''
+library lib;
+
+export 'dart:bbb';
+@MyAnnotation(1)
+@MyAnnotation(2)
+import 'dart:bbb';
+@MyAnnotation(3)
+export 'dart:aaa';
+import 'dart:aaa';
+
+class MyAnnotation {
+  const MyAnnotation(_);
+}
+''');
+    return _assertSorted(r'''
+library lib;
+
+import 'dart:aaa';
+@MyAnnotation(1)
+@MyAnnotation(2)
+import 'dart:bbb';
+
+@MyAnnotation(3)
+export 'dart:aaa';
+export 'dart:bbb';
+
+class MyAnnotation {
+  const MyAnnotation(_);
+}
+''');
+  }
+
   test_OK_unitMembers_class() async {
     addTestFile('''
 class C {}
 class A {}
 class B {}
 ''');
     return _assertSorted(r'''
 class A {}
 class B {}
 class C {}
 ''');
   }
 
   Future _assertSorted(String expectedCode) async {
     _requestSort();
     String resultCode = SourceEdit.applySequence(testCode, fileEdit.edits);
     expect(resultCode, expectedCode);
   }
 
   void _requestSort() {
     Request request = new EditSortMembersParams(testFile).toRequest('0');
     Response response = handleSuccessfulRequest(request);
     var result = new EditSortMembersResult.fromResponse(response);
     fileEdit = result.edit;
   }
 }