anchor.diff:              applicationLegalese: '© 2016 The Chromium Authors',
               aboutBoxChildren: <Widget>[
                 new Padding(
  -                padding: const EdgeInsets.only(top: 24.0, bottom: 8.0),
  -                child: new Center(child: new CircularProgressIndicator())
  -              ),
  -              new Text('Awaiting fix for issue 4512.', textAlign: TextAlign.center),
  +                padding: const EdgeInsets.only(top: 24.0),
  +                child: new RichText(
  +                  text: new TextSpan(
  +                    children: <TextSpan>[
  +                      new TextSpan(
  +                        style: aboutTextStyle,
  +                        text: "Flutter is an early-stage, open-source project to help "
  +                        "developers build high-performance, high-fidelity, mobile "
  +                        "apps for iOS and Android from a single codebase. This "
  +                        "gallery is a preview of Flutter's many widgets, behaviors, "
  +                        "animations, layouts, and more. Learn more about Flutter at "
  +                      ),
  +                      new LinkTextSpan(
  +                        style: aboutLinkStyle,
  +                        url: 'https://flutter.io'
  +                      ),
  +                      new TextSpan(
  +                        style: aboutTextStyle,
  +                        text: ".\n\nTo see the source code for this app, please visit the "
  +                      ),
  +                      new LinkTextSpan(
  +                        style: aboutLinkStyle,
  +                        url: 'https://goo.gl/iv1p4G',
  +                        text: 'flutter github repo'
  +                      ),
  +                      new TextSpan(
  +                        style: aboutTextStyle,
  +                        text: "."
  +                      )
  +                    ]
  +                  )
  +                )
  +              )
               ]
  -          ),
  +          )
           ]
         )
       );
  
positive.code: 
    @override
    Widget build(BuildContext context) {
      return new Drawer(
        child: new Block(
          children: <Widget>[
  
negative.code: // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  import 'package:flutter/gestures.dart';
  import 'package:flutter/material.dart';
  import 'package:flutter/services.dart';
  
  class LinkTextSpan extends TextSpan {
    LinkTextSpan({ TextStyle style, String url, String text }) : super(
      style: style,
      text: text ?? url,
      recognizer: new TapGestureRecognizer()..onTap = () {
        UrlLauncher.launch(url);
      }
    );
  }
  
  class GalleryDrawer extends StatelessWidget {
    GalleryDrawer({
  