[Impeller] curve tolerance is wrong for strokes

[dnfield]

See dnfield/flutter_svg#830

We are dropping the curve tolerance on the floor when tessellating strokes.

I have a patch that will fix this locally, uploading soon.

[dnfield]

An app that reproduced this problem:

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(),
        // Outer white container with padding
        body: CustomPaint(painter: HeartPainter()),
      ),
    ),
  );
}

class HeartPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..style = PaintingStyle.stroke
      ..strokeWidth = 6.0
      ..color = Colors.indigo;

    final path = Path()
      ..moveTo(17.2105, 2.5)
      ..cubicTo(20.4079, 2.5, 23, 5.13553, 23, 8.38663)
      ..cubicTo(23, 11.6377, 21.1478, 14.4753, 18.8095, 16.8802)
      ..cubicTo(17.3729, 18.3578, 15.131, 19.9746, 13.6157, 21.0017)
      ..cubicTo(12.6337, 21.6674, 11.3673, 21.6657, 10.3859, 20.9989)
      ..cubicTo(8.86476, 19.9652, 6.61233, 18.3399, 5.19047, 16.8802)
      ..cubicTo(2.88117, 14.5094, 1, 11.6377, 1, 8.38663)
      ..cubicTo(1, 5.13553, 3.59203, 2.5, 6.78947, 2.5)
      ..cubicTo(9.08107, 2.5, 11.0617, 3.85375, 12, 5.81763)
      ..cubicTo(12.9383, 3.85375, 14.9189, 2.5, 17.2105, 2.5)
      ..close();
    canvas.scale(16);
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(HeartPainter oldDelegate) => false;
}

[github-actions]

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