Multitouch causes weird behaviour on iOS

[ricardoboss]

Version

3.1.0

Library

feedback

Flutter channel

stable

Flutter version

3.22.3

Platform

iOS

Details

When drawing on the screenshot, I used two fingers to attempt to zoom in but instead, it drew a line between my fingers. As I was moving my two fingers, more lines appeared and I could effectively draw rectangles, which is kinda funny but unintended, I guess.

I tested it on Android, but there it only draws lines sometimes.

Steps to reproduce

• Create a new flutter project
• Add feedback to it
• Begin feedback dialog
• Use two fingers while drawing

Output of flutter doctor -v

[✓] Flutter (Channel stable, 3.22.3, on macOS 14.5 23F79 darwin-arm64, locale en-DE)
    • Flutter version 3.22.3 on channel stable at /Users/ricardo/repos/flutter/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision b0850beeb2 (3 weeks ago), 2024-07-16 21:43:41 -0700
    • Engine revision 235db911ba
    • Dart version 3.4.4
    • DevTools version 2.34.3

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/ricardo/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: /Users/ricardo/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
    • Xcode at /Applications/Xcode-16.0.0-Beta.4.app/Contents/Developer
    • Build 16A5211f
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.1)
    • Android Studio at /Users/ricardo/Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)

[✓] VS Code (version 1.79.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (1 available)
    • iPhone 15 Pro Max (mobile)      • 6DE63158-9F28-436E-8EDF-74CF5D38FE59 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-17-5 (simulator)

[✓] Network resources
    • All expected network resources are available.

• No issues found!