Marquee example - simplified test case for Pixel text rendering issue

main.dart

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  MyHomePageState createState() => new MyHomePageState();
}

class MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {

  AnimationController _controller;
  Animation<FractionalOffset> _animation;

  @override
  void initState() {
    _controller = new AnimationController(
      vsync: this,
      duration: const Duration(seconds: 2),
    );
    _animation = new FractionalOffsetTween(
      begin: FractionalOffset.centerLeft,
      end: FractionalOffset.centerRight,
    ).animate(_controller);
    _animate();
  }

  void _animate() async {
    await _controller.forward();
    await _controller.reverse();
    _animate();
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new AnimatedBuilder(
        child: new Text(
          '<marquee>Hello Pixel</marquee>',
          style: Theme.of(context).textTheme.title,
        ),
        animation: _animation,
        builder: (BuildContext context, Widget child) {
          return new Align(
            alignment: _animation.value,
            child: child,
          );
        },
      ),
    );
  }
}

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.deepPurple,
      ),
      home: new MyHomePage(),
    );
  }
}