InteractiveViewer sometimes treats Scale as Pan #63999
Description
Steps to reproduce
- Run the code given below.
- Attempt many different scale gestures.
- Eventually, one may get stuck as a pan. You'll have two fingers on the screen, but no amount of pinching them together/apart will cause a zoom. Lifting one or more fingers will reset it.
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Demo',
home: Scaffold(
appBar: AppBar(title: Text('Demo')),
body: Center(
child: ClipRect(
child: InteractiveViewer(
child: Container(
color: Colors.brown,
child: Image.network(
'https://1001freedownloads.s3.amazonaws.com/vector/thumb/116435/go_board_09x09.png',
),
),
),
),
),
),
);
}
}
Cause
_onScaleUpdate always receives a scale of 1.0 during this stuck gesture. That would make me think that it's a bug with GestureDetector, but I was unable to reproduce this with a lone GestureDetector. There must be something with InteractiveViewer's widget tree or configuration that causes the bug to show up.
Moved to new issue from some discussion in #63006.