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[iOS] Uncommitted composed text is shared between text fields #79031

@pedromassangocode

Description

@pedromassangocode

I found this while triaging #79025.

Steps to Reproduce

  1. Run the code bellow
  2. Use Chinese keyboard
  3. In the first text field type aaa and without committing the change...
  4. Move to the second text field and type bbb

Expected results:
First text field should have aaa
Second text field should have bbb

Actual results:

First text field contains aaa (expected)
Second text field should have aaabbb (BUG)

Important: This may not reproduce on first try, you may need to clean both text fields and try again.

gif

code sample
import 'package:flutter/material.dart';

void main() => runApp(
      MaterialApp(
        theme: ThemeData.dark(),
        home: Scaffold(
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                TextField(
                  keyboardType: TextInputType.text,
                ),
                TextField(
                  keyboardType: TextInputType.emailAddress,
                ),
              ],
            ),
          ),
        ),
      ),
    );
flutter doctor -v
/Users/pedromassango/Code/flutter_stable/bin/flutter doctor --verbose
[✓] Flutter (Channel stable, 2.0.3, on macOS 11.2.3 20D91 darwin-x64, locale en-AO)
    • Flutter version 2.0.3 at /Users/pedromassango/Code/flutter_stable
    • Framework revision 4d7946a68d (6 days ago), 2021-03-18 17:24:33 -0700
    • Engine revision 3459eb2436
    • Dart version 2.12.2

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/pedromassango/Library/Android/sdk
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = /Users/pedromassango/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
    • All Android licenses accepted.

[!] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    ! CocoaPods 1.9.3 out of date (1.10.0 is recommended).
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To upgrade see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.

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

[✓] Android Studio (version 4.1)
    • Android Studio at /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 1.8.0_242-release-1644-b3-6915495)

[✓] IntelliJ IDEA Community Edition (version 2020.3.2)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 54.0.3
    • Dart plugin version 203.7759

[✓] VS Code (version 1.54.3)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.16.0

[✓] Connected device (3 available)
    • iPhone 12 Pro Max (mobile) • AE2F4F51-880E-44FB-BB29-171B766D9B54 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-14-4 (simulator)
    • macOS (desktop)            • macos                                • darwin-x64     • macOS 11.2.3 20D91 darwin-x64
    • Chrome (web)               • chrome                               • web-javascript • Google Chrome 89.0.4389.90

! Doctor found issues in 1 category.
Process finished with exit code 0

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    P2Important issues not at the top of the work lista: internationalizationSupporting other languages or locales. (aka i18n)a: text inputEntering text in a text field or keyboard related problemsengineflutter/engine related. See also e: labels.f: material designflutter/packages/flutter/material repository.found in release: 2.0Found to occur in 2.0found in release: 2.1Found to occur in 2.1frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onplatform-iosiOS applications specifically

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