TextField's text is duplicated on iOS Japanese Keyboard after v1.15.21

[mono0926]

TextField's text is duplicated on iOS Japanese Keyboard after v1.15.21.

On Android, there are no problems.
And before v1.15.20, there are no problems on on iOS Japanese Keyboard.

Steps to Reproduce

Run this on iOS simulator or device(I confirmed it by iPhone 11 Pro simulator).

import 'package:flutter/material.dart';

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

class App extends StatelessWidget {
  const App({Key key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  const HomePage({Key key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: TextField(),
      ),
    );
  }
}

1. Type 「あ」
2. Type 「か」
3. Type 「さ」

Expected results:

「あかさ」should be shown and 「あかさ」is selected until return key typed.

Actual results:

「ああかあかあかさあかさ」was shown and text wasn't selected(no underline).

Logs

(file:///Users/mono/Library/Developer/CoreSimulator/Devices/5511C9A4-2021-4253-9E27-9D67179EB8A1/data/Containers/Data/Application/C86D0DED-FB0C-413D-A376-3F53F61D5830/tmp/flutter_appgeLPMa/
flutter_app/)
[   +1 ms] Updating assets
[  +64 ms] Syncing files to device iPhone 11 Pro...
[   +2 ms] Scanning asset files
[   +2 ms] <- reset
[        ] Compiling dart to kernel with 0 updated files
[   +1 ms] <- recompile package:flutterapp/main.dart d4e6648a-5335-4c00-938f-b26a89031e23
[        ] <- d4e6648a-5335-4c00-938f-b26a89031e23
[  +66 ms] Updating files
[   +3 ms] [DEVICE LOG] 2020-03-17 13:52:55.589857+0900  localhost Runner[61373]: (FrontBoardServices) [com.apple.BackBoard:Display] [FBSDisplaySource 1-1] silently connecting
<FBSDisplayConfiguration: 0x6000006d5340; Main; mode: "375x812@3x 60Hz p3 SDR">
[        ] [DEVICE LOG] 2020-03-17 13:52:55.589932+0900  localhost Runner[61373]: (FrontBoardServices) [com.apple.BackBoard:Display] [FBSDisplaySource 1-1] initialized
<FBSDisplayConfiguration: 0x6000006d5340; Main; mode: "375x812@3x 60Hz p3 SDR">
[  +66 ms] DevFS: Sync finished
[        ] Syncing files to device iPhone 11 Pro... (completed in 143ms)
[        ] Synced 0.9MB.
[   +1 ms] Sending to VM service: _flutter.listViews({})
[   +1 ms] Result: {type: FlutterViewList, views: [{type: FlutterView, id: _flutterView/0x7fde3e008e20, isolate: {type: @Isolate, fixedId: true, id: isolates/436468375844895, name:
main.dart$main-436468375844895, number: 436468375844895}}]}
[        ] <- accept
[        ] Connected to _flutterView/0x7fde3e008e20.
[   +1 ms] Flutter run key commands.
[   +2 ms] r Hot reload. 🔥🔥🔥
[   +1 ms] R Hot restart.
[        ] h Repeat this help message.
[        ] d Detach (terminate "flutter run" but leave application running).
[        ] c Clear the screen

❯ flutterm analyze
Analyzing flutter_app...                                                
No issues found! (ran in 6.8s)

[✓] Flutter (Channel master, v1.15.23-pre.11, on Mac OS X 10.15.3 19D76, locale en-JP)
    • Flutter version 1.15.23-pre.11 at /Users/mono/Git/flutterm
    • Framework revision 93a6057c42 (6 hours ago), 2020-03-16 16:02:22 -0700
    • Engine revision 5a07488251
    • Dart version 2.8.0 (build 2.8.0-dev.14.0 d7a7854a5e)

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.0)
    • Android SDK at /Users/mono/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C504
    • CocoaPods version 1.9.1

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

[✓] Android Studio (version 3.6)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 44.0.2
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] Android Studio
    • Android Studio at /Applications/Android Studio 4.0 Preview.app/Contents
    • Flutter plugin version 40.2.4
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] IntelliJ IDEA Community Edition (version 2019.1.3)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 37.0.3
    • Dart plugin version 191.7830

[✓] VS Code (version 1.43.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.8.1

[✓] Connected device (8 available)
    • PH 1                      • PM1LHMA832902176                     • android-arm64  • Android 10 (API 29)
    • Android SDK built for x86 • emulator-5554                        • android-x86    • Android 10 (API 29) (emulator)
    • monoyagon                 • 00008027-000A08140CE8002E            • ios            • iOS 13.3.1
    • iPhone 11 Pro             • 5511C9A4-2021-4253-9E27-9D67179EB8A1 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-13-3 (simulator)
    • iPad Pro (11-inch)        • 124F9757-2E29-4304-A823-D0924367154E • ios            • com.apple.CoreSimulator.SimRuntime.iOS-13-3 (simulator)
    • macOS                     • macOS                                • darwin-x64     • Mac OS X 10.15.3 19D76
    • Chrome                    • chrome                               • web-javascript • Google Chrome 80.0.3987.132
    • Web Server                • web-server                           • web-javascript • Flutter Tools

• No issues found!

---

I examined this a little

args is wrong at this point:

flutter/packages/flutter/lib/src/services/text_input.dart

Line 1067 in 3e63411

_currentConnection._client.updateEditingValue(TextEditingValue.fromJSON(args[1] as Map<String, dynamic>));

, so I suspect that this is https://github.com/flutter/engine bug.

[dnfield]

Tentatively marking this as TODAY.

/cc @GaryQian

[dnfield]

Verified this locally. Verified that the linked engine patch did not cause this. It's much more likely code in the framework around text input handling.

[mono0926]

Thanks for the very quick fix 🙏

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.