anchor.diff:  import 'dart:async';
  +import 'dart:math' as math;
   
   import 'package:flutter/material.dart';
  +import 'package:flutter/rendering.dart';
   import 'package:flutter_redux/flutter_redux.dart';
   import 'package:fluttertoast/fluttertoast.dart';
   import 'package:gsy_github_app_flutter/bloc/trend_bloc.dart';
  
positive.code: import 'package:gsy_github_app_flutter/common/utils/common_utils.dart';
  import 'package:gsy_github_app_flutter/common/utils/navigator_utils.dart';
  import 'package:gsy_github_app_flutter/widget/gsy_card_item.dart';
  import 'package:gsy_github_app_flutter/widget/repos_item.dart';
  import 'package:redux/redux.dart';
  
  
negative.code:     );
    }
  
    _renderHeaderPopItem(String data, List<TrendTypeModel> list,
        PopupMenuItemSelected<TrendTypeModel> onSelected) {
      return new Expanded(
        child: new PopupMenuButton<TrendTypeModel>(
          child: new Center(
              child: new Text(data, style: GSYConstant.middleTextWhite)),
          onSelected: onSelected,
          itemBuilder: (BuildContext context) {
            return _renderHeaderPopItemChild(list);
  