[FileSelector][web] openFiles never returns when user presses "cancel" in system UI file picker #121328
Description
Reproduce
With the following in pubspec.yaml:
environment:
sdk: '>=2.19.2 <3.0.0'
dependencies:
flutter:
sdk: flutter
file_selector:
file_selector_web:and main.dart:
import 'package:file_selector/file_selector.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData.dark(),
home: Scaffold(
body: Center(
child: TextButton(
child: const Text("OPEN FILES"),
onPressed: () async {
try {
print("opening");
final r = await openFiles(); // doc: "Returns an empty list if the user cancels the operation."
print("done: $r");
} catch (e) {
print("ERROR: $e");
}
},
),
),
),
);
}
}- start debugging in web
- press "OPEN FILES" button
- wait for system UI
- press "CANCEL" in system UI file picker
Expectation
openFiles returns an empty list after the user presses the "Cancel" button
debug console output:
opening
done: []
Actual
openFiles does not return at all
debug console output:
opening
Compare with selecting a file (works as expected)
- press "OPEN FILES" button
- wait for system UI
- select any file
- press "Open" in system UI file picker
debug console output:
opening
done: [Instance of 'XFile']
doctor
[✓] Flutter (Channel stable, 3.7.3, on macOS 12.1 21C52 darwin-arm64, locale en-DE)
• Flutter version 3.7.3 on channel stable at /Users/gian/development/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 9944297138 (2 weeks ago), 2023-02-08 15:46:04 -0800
• Engine revision 248290d6d5
• Dart version 2.19.2
• DevTools version 2.20.1
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
• Android SDK at /Users/gian/Library/Android/sdk
• Platform android-33, build-tools 33.0.0
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 13C100
• CocoaPods version 1.11.3
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2021.2)
• 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 11.0.12+0-b1504.28-7817840)
[✓] VS Code (version 1.74.3)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.58.0
[✓] Connected device (2 available)
• macOS (desktop) • macos • darwin-arm64 • macOS 12.1 21C52 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 110.0.5481.177
[✓] HTTP Host Availability
• All required HTTP hosts are available
• No issues found!