TextEditingController.value.composing is giving wrong results in Web & iOS #174159
Description
Steps to reproduce
- Create an example app with a TextField.
- Log its TextEditingController.value.composing.
- Run in MacOS, type "n", "h", then select "你好" with pinyin IME.
- Run in Web, type "n", "h", then select "你好" with pinyin IME.
Expected results
After the user selects "你好", The final "composing" TextRange should both be (start: -1, end: -1) in MacOS and Web.
Actual results
In MacOS, the final composing TextRange is logged as (start: -1, end: -1), but in Web, the final composing TextRange is logged as (start: 0, end: 2),
Code sample
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(
title: 'Flutter Demo',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
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> {
final _controller = TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text('test'),
TextField(
controller: _controller,
onChanged: (_) {
print(_controller.value.composing);
},
),
],
),
),
);
}
}
Screenshots or Video
Screenshots / Video demonstration
Logs
Logs
MacOS
flutter: TextRange(start: 0, end: 1)
flutter: TextRange(start: 0, end: 3)
flutter: TextRange(start: -1, end: -1)Web
TextRange(start: 0, end: 1)
TextRange(start: 0, end: 3)
TextRange(start: 0, end: 2)Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.35.1, on macOS 14.3.1 23D60 darwin-x64, locale
en-GB) [669ms]
• Flutter version 3.35.1 on channel stable at /Applications/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 20f8274939 (6 days ago), 2025-08-14 10:53:09 -0700
• Engine revision 1e9a811bf8
• Dart version 3.9.0
• DevTools version 2.48.0
• Pub download mirror https://pub.flutter-io.cn
• Flutter download mirror https://storage.flutter-io.cn
• Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop,
enable-windows-desktop, enable-android, enable-ios, cli-animations,
enable-lldb-debugging
[✗] Android toolchain - develop for Android devices [325ms]
• Android SDK at /Users/herongkai/Library/Android/sdk
• Emulator version unknown
✗ cmdline-tools component is missing.
Try installing or updating Android Studio.
Alternatively, download the tools from
https://developer.android.com/studio#command-line-tools-only and make sure
to set the ANDROID_HOME environment variable.
See https://developer.android.com/studio/command-line for more details.
[✓] Xcode - develop for iOS and macOS (Xcode 15.3) [1,756ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 15E204a
• CocoaPods version 1.16.2
[✓] Chrome - develop for the web [22ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[!] Android Studio (not installed) [21ms]
• Android Studio not found; download from
https://developer.android.com/studio/index.html
(or visit https://flutter.dev/to/macos-android-setup for detailed
instructions).
[✓] VS Code (version 1.103.1) [19ms]
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.116.0
[✓] Connected device (2 available) [8.3s]
• macOS (desktop) • macos • darwin-x64 • macOS 14.3.1 23D60 darwin-x64
• Chrome (web) • chrome • web-javascript • Google Chrome 139.0.7258.128
! Error: Browsing on the local area network for Pad Thai. Ensure the device
is unlocked and attached with a cable or associated with the same local
area network as this Mac.
The device must be opted into Developer Mode to connect wirelessly. (code
-27)
! Error: Browsing on the local area network for rp. Ensure the device is
unlocked and attached with a cable or associated with the same local area
network as this Mac.
The device must be opted into Developer Mode to connect wirelessly. (code
-27)
[✓] Network resources [962ms]
• All expected network resources are available.
! Doctor found issues in 2 categories.