Selecting .app files is impossible on MacOS

[FilledStacks]

The bug
When using the file picker and I select the file Runner.app it throws the following exception.

FileSystemException: Cannot retrieve length of file, path = '/Volumes/Macintosh/Users/danemackier/Desktop/testsweets-example/build/ios/Debug-iphoneos/Runner.app' (OS Error: Is a directory, errno = 21)

And when I use the getDirectoryPath function the Runner.app is not available for selection. So it's impossible to select a .app file at the moment

Platform

• [] Android
• [] iOS
• [] Web
• Desktop (Go)

Platform OS version
macOS Big Sur Version 11.6

How are you picking?

FilePickerResult? file = await FilePicker.platform.pickFiles(
  type: FileType.custom,
  allowedExtensions: ['app', 'ipa'],
);

Details to reproduce the issue

1. Create a folder Runner.app
2. Open the file picker with the snippet above
3. Select the Runner.app file
4. See exception

Error Log

FileSystemException: Cannot retrieve length of file, path = '/Volumes/Macintosh/Users/danemackier/Desktop/testsweets-example/build/ios/Debug-iphoneos/Runner.app' (OS Error: Is a directory, errno = 21)

Flutter Version details

Flutter version details

[✓] Flutter (Channel stable, 2.5.1, on macOS 11.6 20G165 darwin-x64, locale en-ZA) • Flutter version 2.5.1 at /Users/danemackier/flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision ffb2ecea52 (4 weeks ago), 2021-09-17 15:26:33 -0400 • Engine revision b3af521a05 • Dart version 2.14.2

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at /Users/danemackier/Library/Android/sdk
• Platform android-31, build-tools 31.0.0
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.5.1, Build version 12E507
• CocoaPods version 1.11.2

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

[✓] Android Studio (version 3.5)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 44.0.1
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] VS Code (version 1.61.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.27.0

[✓] Connected device (2 available)
• macOS (desktop) • macos • darwin-x64 • macOS 11.6 20G165 darwin-x64
• Chrome (web) • chrome • web-javascript • Google Chrome 94.0.4606.81

Additional context
We need to select the .app file because we're building an end-to-end testing tool and need to select the app to load onto the device. So selecting a .app folder is important for deploying the app to the simulator.

[philenius]

@miguelpruivo , thank you for merging. Could you please publish version 4.1.6 to pub.dev? I can't see it in the list of published versions: https://pub.dev/packages/file_picker/versions

[miguelpruivo]

Done @philenius, thank you.