[CP-Stable] Fix deleting text in EditableText with CJK keyboard while in CupertinoPageRoute throws exception #153949
Description
Issue Link
Target
stable
Cherry pick PR Link
Changelog Description
Fix a crash when deleting text in an EditableText inside CupertinoPageRoute, with a CJK keyboard on Android.
Impacted Users
Users of Flutter TextField using CJK keyboard and CupertinoPageRoute
Impact Description
This triggers a crash when an Android user, using a CJK keyboard, tries to delete text in a TextField with scrollable text, that is inside of a CupertinoPageRoute.
Workaround
No workaround.
Risk
low
Test Coverage
yes
Validation Steps
Run the example below on an Android device with a CJK keyboard (tested on Gboard), tap the Push CupertinoPageRoute button, scroll to the end of the TextField and select a word (either through a long press or double tap), then delete that word. The app should not throw an exception when this happens.
import 'package:flutter/cupertino.dart';
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(
home: Scaffold(
appBar: AppBar(
title: const Text('Test TextField in CupertinoRoute'),
),
body: const Padding(
padding: EdgeInsets.all(16.0),
child: MyHome(),
),
),
);
}
}
class MyHome extends StatefulWidget {
const MyHome({super.key});
@override
State<MyHome> createState() => _MyHomeState();
}
class _MyHomeState extends State<MyHome> {
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
return Center(
child: Column(mainAxisAlignment: MainAxisAlignment.start, children: <Widget>[
TextButton(
onPressed: () async {
await Navigator.of(context).push(
CupertinoPageRoute<void>(
settings: const RouteSettings(name: '/TestCupertinoRoute'),
builder: (BuildContext innerContext) => const MyTextTest(),
),
);
},
child: const Text('Push CupertinoPageRoute'),
),
]),
);
}
}
class MyTextTest extends StatefulWidget {
const MyTextTest({super.key});
@override
State<MyTextTest> createState() => _MyTextTestState();
}
class _MyTextTestState extends State<MyTextTest> {
final TextEditingController _controller = TextEditingController(text: 'Some long text that should scroll. ' * 20);
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Material(
child: Center(
child: TextField(
controller: _controller,
),
),
);
}
}