anchor.diff:  // Copyright 2019 The Chromium Authors. All rights reserved.
   // Use of this source code is governed by a BSD-style license that can be
   // found in the LICENSE file.
  +
  +import 'dart:math' as math;
   
   import 'package:flutter/material.dart';
   import 'package:provider/provider.dart';
  
positive.code:         const SizedBox(width: denseSpacing),
          Text(description),
        ],
      );
    }
  }
  
negative.code:     );
  
      // Max FPS non-jank value in ms. E.g., 16.6 for 60 FPS, 8.3 for 120 FPS.
      final targetMsPerFrame = 1000 / displayRefreshRate;
      final targetLineY = constraints.maxHeight - targetMsPerFrame / msPerPx;
  
      canvas.drawLine(
  