pkg/docgen: fixed type references within typedef doc comments

pkg/docgen/lib/src/models/owned_indexable.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 docgen.models.owned_indexable;
 
 import '../exports/mirrors_util.dart' as dart2js_util;
 import '../exports/source_mirrors.dart';
 
 import '../library_helpers.dart';
 import '../mdn.dart';
 import '../package_helpers.dart';
 
 import 'annotation.dart';
+import 'dummy_mirror.dart';
 import 'indexable.dart';
 import 'model_helpers.dart';
 
 abstract class OwnedIndexable<TMirror extends DeclarationMirror>
     extends Indexable<TMirror> {
   /// List of the meta annotations on this item.
   final List<Annotation> annotations;
 
   /// The object one scope-level above which this item is defined.
   ///
@@ skipping 16 matching lines @@
     var domAnnotation = this.annotations.firstWhere(
         (e) => e.mirror.qualifiedName == #metadata.DomName,
         orElse: () => null);
     if (domAnnotation == null) return '';
     var domName = domAnnotation.parameters.single;
 
     return mdnComment(rootDirectory, logger, domName);
   }
 
   String get packagePrefix => owner.packagePrefix;
+
+  String findElementInScope(String name) {
+    var lookupFunc = determineLookupFunc(name);
+    var result = lookupFunc(mirror, name);
+    if (result != null) {
+      result = getDocgenObject(result);
+      if (result is DummyMirror) return packagePrefix + result.docName;
+      return result.packagePrefix + result.docName;
+    }
+
+    if (owner != null) {
+      var result = owner.findElementInScope(name);
+      if (result != null) {
+        return result;
+      }
+    }
+    return super.findElementInScope(name);
+  }
 }