anchor.diff:  // Use of this source code is governed by a BSD-style license that can be
   // found in the LICENSE file.
   
  -// @dart=2.9
  +// ignore_for_file: import_of_legacy_library_into_null_safe
   
   import 'package:flutter/foundation.dart';
   import 'package:flutter/material.dart';
  
positive.code: 
    static const _scrollBarKey = Key('console-scrollbar');
  
    List<ConsoleLine> _currentLines;
    bool _scrollToBottom = true;
    bool _considerScrollAtBottom = true;
    double _lastScrollOffset = 0.0;
  
    DebuggerController _debuggerController;
  
    @override
    void initState() {
      super.initState();
      _currentLines = const [];
      _initHelper();
    }
  
  
negative.code: /// top-right corner.
  class Console extends StatelessWidget {
    const Console({
      this.controls = const <Widget>[],
      required this.lines,
      this.title,
      this.footer,
    }) : super();
  
    final Widget? title;
    final Widget? footer;
    final List<Widget> controls;
    final ValueListenable<List<ConsoleLine>> lines;
  
  