Flutter 3.10.4 error on Apple Pencil double tap

Is there an existing issue for this?

I have searched the existing issues
I have read the guide to filing a bug

Steps to reproduce

Copy sample code
Double tap Apple Pencil
Observe error

Expected results

No error

Actual results

Gestures produces error

Code sample

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  TextEditingController _controller = TextEditingController();

  @override
  void initState() {
    super.initState();

    _controller.text = """HELLO""";
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Container(
          height: 600,
          width: 600,
          color: Colors.yellowAccent,
          child: TextField(
            scrollPhysics: const NeverScrollableScrollPhysics(),
            scrollPadding: EdgeInsets.zero,
            controller: _controller,
            keyboardType: TextInputType.multiline,
            decoration: null,
            maxLines: null,
            enabled: true,
            onChanged: (t) {},
            readOnly: false,
            clipBehavior: Clip.none,
          ),
        ),
      ),
    );
  }
}

Screenshots or Video

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Logs

======== Exception caught by gestures library ======================================================
The following StateError was thrown while handling a pointer data packet:
Bad state: Unreachable

When the exception was thrown, this was the stack: 
#0      PointerEventConverter.expand.<anonymous closure> (package:flutter/src/gestures/converter.dart:282:15)
#1      MappedIterator.moveNext (dart:_internal/iterable.dart:393:20)
#2      WhereTypeIterator.moveNext (dart:_internal/iterable.dart:871:20)
#3      ListQueue.addAll (dart:collection/queue.dart:748:25)
#4      GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:291:29)
#5      _invoke1 (dart:ui/hooks.dart:158:13)
#6      PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:382:7)
#7      _dispatchPointerDataPacket (dart:ui/hooks.dart:91:31)
====================================================================================================

Flutter Doctor output

Doctor output

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.10.4, on macOS 13.2.1 22D68 darwin-arm64, locale en-NZ)
[!] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.
[✓] Xcode - develop for iOS and macOS (Xcode 14.3.1)
[✗] Chrome - develop for the web (Cannot find Chrome executable at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome)
    ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✓] Android Studio (version 2021.2)
[✓] IntelliJ IDEA Ultimate Edition (version 2023.1)
[✓] VS Code (version 1.79.0)
[✓] Connected device (2 available)
[✓] Network resources

! Doctor found issues in 2 categories.

Note this is on an iPad Pro using Apple Pencil. Before upgrading flutter from 3.7.12 I have never seen this error

@LouiseHsu

It seems there is an unfinished task as mentioned here:

flutter/packages/flutter/lib/src/gestures/converter.dart

Lines 276 to 282 in 682aa38

    
           case ui.PointerSignalKind.unknown: 
        
           default: // ignore: no_default_cases, to allow adding a new [PointerSignalKind] - PointerStylusAuxiliaryAction 
        
           // TODO(louisehsu): remove after landing engine PR https://github.com/flutter/engine/pull/39637 
        
             // This branch should already have 'unknown' filtered out, but 
        
             // we don't want to return anything or miss if someone adds a new 
        
             // enumeration to PointerSignalKind. 
        
             throw StateError('Unreachable');

Labeling the issue for more insights (I don't have Apple Pencil device to verify this, though)
cc @LouiseHsu

Yeah that case needs to be removed, but since the double tap work ended up being scrapped there shouldn't be an unknown PointerSignalKind anyways. I dont have my pencil with me today but let me look into this.

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Flutter 3.10.4 error on Apple Pencil double tap #128762

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	case ui.PointerSignalKind.unknown:
	default: // ignore: no_default_cases, to allow adding a new [PointerSignalKind] - PointerStylusAuxiliaryAction
	// TODO(louisehsu): remove after landing engine PR https://github.com/flutter/engine/pull/39637
	// This branch should already have 'unknown' filtered out, but
	// we don't want to return anything or miss if someone adds a new
	// enumeration to PointerSignalKind.
	throw StateError('Unreachable');

Flutter 3.10.4 error on Apple Pencil double tap #128762

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MousyBusiness commented on Jun 13, 2023

huycozy commented on Jun 13, 2023

LouiseHsu commented on Jun 13, 2023

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