Keep directive annotations while sorting.

pkg/analysis_server/test/edit/sort_members_test.dart

Index: pkg/analysis_server/test/edit/sort_members_test.dart
diff --git a/pkg/analysis_server/test/edit/sort_members_test.dart b/pkg/analysis_server/test/edit/sort_members_test.dart
index a955360b4fa82b011fc6be6578eee6ecae926339..ee801df7b123acc83246fe0ffd72b525f2d033b4 100644
--- a/pkg/analysis_server/test/edit/sort_members_test.dart
+++ b/pkg/analysis_server/test/edit/sort_members_test.dart
@@ -144,6 +144,40 @@ 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 {}