Issue 23409. Don't set 'propagatedType' in (vs. after) 'name is Type'.

pkg/analysis_server/test/services/refactoring/extract_method_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.services.refactoring.extract_method;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/correction/status.dart';
@@ skipping 2366 matching lines @@
   res(a);
 // end
 }
 
 void res(int a) {
   print(a);
 }
 ''');
   }
 
+  test_statements_parameters_ignoreInnerPropagatedType() async {
+    indexTestUnit('''
+main(Object x) {
+// start
+  if (x is int) {
+    print('int');
+  }
+  if (x is bool) {
+    print('bool');
+  }
+// end
+}
+''');
+    _createRefactoringForStartEndComments();
+    // apply refactoring
+    return _assertSuccessfulRefactoring('''
+main(Object x) {
+// start
+  res(x);
+// end
+}
+
+void res(Object x) {
+  if (x is int) {
+    print('int');
+  }
+  if (x is bool) {
+    print('bool');
+  }
+}
+''');
+  }
+
   test_statements_parameters_importType() {
     _addLibraryReturningAsync();
     indexTestUnit('''
 import 'asyncLib.dart';
 main() {
   var v = newFuture();
 // start
   print(v);
 // end
 }
@@ skipping 318 matching lines @@
    * Returns a deep copy of [refactoring] parameters.
    * There was a bug masked by updating parameter instances shared between the
    * refactoring and the test.
    */
   List<RefactoringMethodParameter> _getParametersCopy() {
     return refactoring.parameters.map((p) {
       return new RefactoringMethodParameter(p.kind, p.type, p.name, id: p.id);
     }).toList();
   }
 }