[Linux Web] Pressing super key throws error "Attempted to send a key down event when no keys are in keysPressed."

Steps to Reproduce

1. Execute flutter run -d chrome on the code sample
2. Type the "super" or "windows" key on the keyboard

Expected results:
No errors

Actual results:
Error thrown: Should never encounter KeyData when transitMode is rawKeyData.

Code sample

This happens with the example code from flutter create

Logs

[  +62 ms] executing: uname -m
[  +31 ms] Exit code 0 from: uname -m
[        ] x86_64
[   +6 ms] executing: [/opt/flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +7 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] fd71de13fddae5ef2646c36e2e553b6df948ced5
[        ] executing: [/opt/flutter/] git tag --points-at fd71de13fddae5ef2646c36e2e553b6df948ced5
[  +15 ms] Exit code 0 from: git tag --points-at fd71de13fddae5ef2646c36e2e553b6df948ced5
[   +1 ms] executing: [/opt/flutter/] git describe --match *.*.* --long --tags fd71de13fddae5ef2646c36e2e553b6df948ced5
[  +47 ms] Exit code 0 from: git describe --match *.*.* --long --tags fd71de13fddae5ef2646c36e2e553b6df948ced5
[        ] 2.10.0-0.0.pre-683-gfd71de13fd
[   +8 ms] executing: [/opt/flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[   +5 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/master
[        ] executing: [/opt/flutter/] git ls-remote --get-url origin
[   +4 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter
[  +81 ms] executing: [/opt/flutter/] git rev-parse --abbrev-ref HEAD
[   +6 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] master
[  +53 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +2 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'WindowsUwpEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[   +9 ms] Artifact Instance of 'PubDependencies' is not required, skipping update.
[  +10 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'WindowsUwpEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +106 ms] Skipping pub get: version match.
[ +128 ms] Generating /home/spiral/sources/test_flutter_desktop/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
[ +309 ms] Launching lib/main.dart on Chrome in debug mode...
[ +110 ms] Updating assets
[  +85 ms] Waiting for connection from debug service on Chrome...
[  +58 ms] <- reset
[   +7 ms] /opt/flutter/bin/cache/dart-sdk/bin/dart --disable-dart-dev /opt/flutter/bin/cache/dart-sdk/bin/snapshots/frontend_server.dart.snapshot --sdk-root /opt/flutter/bin/cache/flutter_web_sdk/ --incremental --target=dartdevc --debugger-module-names --experimental-emit-debug-metadata -DFLUTTER_WEB_AUTO_DETECT=true --output-dill /tmp/flutter_tools.JKAYIP/flutter_tool.OGPHGU/app.dill --libraries-spec file:///opt/flutter/bin/cache/flutter_web_sdk/libraries.json --packages /home/spiral/sources/test_flutter_desktop/.dart_tool/package_config.json -Ddart.vm.profile=false -Ddart.vm.product=false --enable-asserts --track-widget-creation --filesystem-root /tmp/flutter_tools.JKAYIP/flutter_tools.BGBSKH --filesystem-scheme org-dartlang-app --initialize-from-dill build/b1b715402d823b7fd5c2b68d2edcb2ce.cache.dill.track.dill --platform file:///opt/flutter/bin/cache/flutter_web_sdk/kernel/flutter_ddc_sdk_sound.dill --sound-null-safety
[   +9 ms] <- compile org-dartlang-app:/web_entrypoint.dart
[+18775 ms] Waiting for connection from debug service on Chrome... (completed in 18.8s)
[        ] Synced 29.4MB.
[        ] <- accept
[        ] Caching compiled dill
[ +253 ms] Using Chromium 98.0.4758.102 

[   +4 ms] executing: uname -m
[   +7 ms] Exit code 0 from: uname -m
[        ] x86_64
[+1223 ms] [CHROME]: libva error: vaGetDriverNameByIndex() failed with unknown libva error, driver_name = (null)
[  +37 ms] [CHROME]: [621994:621994:0228/164855.256215:ERROR:sandbox_linux.cc(377)] InitializeSandbox() called with multiple threads in process gpu-process.
[  +66 ms] [CHROME]: 
[        ] [CHROME]: DevTools listening on ws://127.0.0.1:45425/devtools/browser/d372837c-2c6a-4bfb-92bb-10bc6cec0408
[ +947 ms] DwdsInjector: Received request for entrypoint at http://localhost:37091/main_module.bootstrap.js
[   +4 ms] MetadataProvider: Loading debug metadata...
[   +4 ms] MetadataProvider: Loaded debug metadata for module: web_entrypoint.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/test_flutter_desktop/main.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/material.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/widgets.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/widgets/will_pop_scope.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/widgets/widget_inspector.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/rendering.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/rendering/wrap.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/painting.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/services/text_formatter.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/list_extensions.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/equality.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/algorithms.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/iterable_zip.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/iterable_extensions.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/functions.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/combined_wrappers/combined_map.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/combined_wrappers/combined_list.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/canonicalized_map.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/services/keyboard_maps.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/services/keyboard_key.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/services/binary_messenger.dart
[   +1 ms] MetadataProvider: Loaded debug metadata for module: packages/vector_math/vector_math_64.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/services/system_sound.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/services/system_navigator.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/gestures.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/gestures/velocity_tracker.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/gestures/events.dart
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[   +7 ms] DwdsInjector: Injected debugging metadata for entrypoint at http://localhost:37091/main_module.bootstrap.js
[+2994 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: true
[  +27 ms] DartUri: Unresolved uri: dart:web_sql
[   +1 ms] DartUri: Unresolved uri: dart:ui
[  +45 ms] DevHandler: Debug service listening on ws://127.0.0.1:46791/T0XXdBEiIdY=/ws

[  +19 ms] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 9, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 9, params: {streamId: Stdout, includePrivateMembers: false}}}}
[   +5 ms] This app is linked to the debug service: ws://127.0.0.1:46791/T0XXdBEiIdY=/ws
[        ] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 10, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 10, params: {streamId: Stderr, includePrivateMembers: false}}}}
[        ] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 11, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 11, params: {streamId: Isolate, includePrivateMembers: false}}}}
[   +4 ms] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 12, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 12, params: {streamId: Extension, includePrivateMembers: false}}}}
[   +4 ms] Debug service listening on ws://127.0.0.1:46791/T0XXdBEiIdY=/ws
[        ] 💪 Running with sound null safety 💪
[   +2 ms] 🔥  To hot restart changes while running, press "r" or "R".
[        ] For a more detailed help message, press "h". To quit, press "q".
[        ] An Observatory debugger and profiler on Chrome is available at: http://127.0.0.1:46791/T0XXdBEiIdY=
[+1300 ms] The Flutter DevTools debugger and profiler on Chrome is available at: http://127.0.0.1:9102?uri=http://127.0.0.1:46791/T0XXdBEiIdY=
[+1370 ms] Error: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
           _pressedKeys.containsKey(event.physicalKey)
           "A KeyUpEvent is dispatched, but the state shows that the physical key is not pressed. If this occurs in real application, please report this bug to Flutter. If this occurs in unit tests, please ensure that simulated events follow Flutter's event model as documented in `HardwareKeyboard`. This was the event: KeyUpEvent#cddde(physicalKey: PhysicalKeyboardKey#700e3(usbHidUsage: \"0x000700e3\", debugName: \"Meta Left\"), logicalKey: LogicalKeyboardKey#4b191(keyId: \"0x200000106\", keyLabel: \"Meta Left\", debugName: \"Meta Left\"), character: null, timeStamp: 0:00:06.517900, synthesized)"
               at Object.throw_ [as throw] (http://localhost:37091/dart_sdk.js:5065:11)
               at Object.assertFailed (http://localhost:37091/dart_sdk.js:4990:15)
               at http://localhost:37091/packages/flutter/src/services/restoration.dart.lib.js:5398:74
               at hardware_keyboard.HardwareKeyboard.new.[_assertEventIsRegular] (http://localhost:37091/packages/flutter/src/services/restoration.dart.lib.js:5404:26)
               at hardware_keyboard.HardwareKeyboard.new.handleKeyEvent (http://localhost:37091/packages/flutter/src/services/restoration.dart.lib.js:5458:34)
               at hardware_keyboard.KeyEventManager.new.handleKeyData (http://localhost:37091/packages/flutter/src/services/restoration.dart.lib.js:5609:38)
               at http://localhost:37091/dart_sdk.js:171430:47
               at Object.invoke (http://localhost:37091/dart_sdk.js:190791:7)
               at _engine.EnginePlatformDispatcher.__.invokeOnKeyData (http://localhost:37091/dart_sdk.js:171430:17)
               at _engine.KeyboardBinding.__.[_onKeyData] (http://localhost:37091/dart_sdk.js:170122:49)
               at http://localhost:37091/dart_sdk.js:170485:21
               at http://localhost:37091/dart_sdk.js:170460:51
               at IdentityMap.new.removeWhere (http://localhost:37091/dart_sdk.js:23228:15)
               at http://localhost:37091/dart_sdk.js:170458:47
               at IdentityMap.from.forEach (http://localhost:37091/dart_sdk.js:27724:11)
               at _engine.KeyboardConverter.new.[_handleEvent] (http://localhost:37091/dart_sdk.js:170456:53)
               at _engine.KeyboardConverter.new.handleEvent (http://localhost:37091/dart_sdk.js:170488:27)
               at http://localhost:37091/dart_sdk.js:170128:76
               at loggedHandler (http://localhost:37091/dart_sdk.js:170105:18)
[ +259 ms] ══╡ EXCEPTION CAUGHT BY SERVICES LIBRARY ╞══════════════════════════════════════════════════════════
[        ] The following assertion was thrown during a platform message callback:
[        ] Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/raw_keyboard.dart:690:7
[        ] event is! RawKeyDownEvent || _keysPressed.isNotEmpty
[        ] "Attempted to send a key down event when no keys are in keysPressed. This state can occur if the key
[        ] event being sent doesn't properly set its modifier flags. This was the event:
[        ] RawKeyDownEvent#64abe(logicalKey: LogicalKeyboardKey#4b191(keyId: \"0x200000106\", keyLabel: \"Meta
[        ] Left\", debugName: \"Meta Left\"), physicalKey: PhysicalKeyboardKey#700e3(usbHidUsage:
[        ] \"0x000700e3\", debugName: \"Meta Left\"), repeat: false) and its data:
[        ] RawKeyEventDataWeb#66361(code: MetaLeft, key: Meta, location: 1, metaState: 0, keyCode: 91)"
[        ] When the exception was thrown, this was the stack:
[        ] dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
[        ] dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 29:3    assertFailed
[        ] packages/flutter/src/services/raw_keyboard.dart 690:49                        handleRawKeyEvent
[        ] packages/flutter/src/services/hardware_keyboard.dart 864:33                   handleRawKeyMessage
[        ] dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54            runBody
[        ] dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5            _async
[        ] packages/flutter/src/services/hardware_keyboard.dart 854:51                   handleRawKeyMessage
[        ] packages/flutter/src/services/platform_channel.dart 77:49                     <fn>
[        ] dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54            runBody
[        ] dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5            _async
[        ] packages/flutter/src/services/platform_channel.dart 76:58                     <fn>
[        ] packages/flutter/src/services/binding.dart 380:35                             <fn>
[        ] dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54            runBody
[        ] dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5            _async
[        ] packages/flutter/src/services/binding.dart 377:98                             <fn>
[        ] lib/_engine/engine/platform_dispatcher.dart 1091:13                           invoke2
[        ] lib/ui/channel_buffers.dart 25:12                                             invoke
[        ] lib/ui/channel_buffers.dart 65:7                                              push
[        ] lib/ui/channel_buffers.dart 130:16                                            push
[        ] lib/_engine/engine/platform_dispatcher.dart 305:25                            invokeOnPlatformMessage
[        ] lib/_engine/engine/keyboard.dart 130:39                                       [_handleHtmlEvent]
[        ] lib/_engine/engine/keyboard.dart 32:7                                         <fn>
[        ] ════════════════════════════════════════════════════════════════════════════════════════════════════
[  +93 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[+1871 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[ +107 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[ +456 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[ +190 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[ +180 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[ +152 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[  +62 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[ +174 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[+3377 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/raw_keyboard.dart:690:7
[ +549 ms] Another exception was thrown: Assertion failed: file:///opt/flutter/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
[+2349 ms] DevHandler: Stopped debug service on ws://127.0.0.1:44563

[  +62 ms] Application finished.
[   +4 ms] "flutter run" took 37,922ms.
[   +3 ms] Running shutdown hooks
[        ] Shutdown hooks complete
[   +8 ms] exiting with code 0
^C
[1]-  Done                    flutter run --verbose -d chrome > /tmp/logs
[2]+  Done                     2> /tmp/logs

spiral@xps:~$ flutter analyze
Analyzing test_flutter_desktop...                                       
No issues found! (ran in 2.0s)

spiral@xps:~$ flutter doctor -v
[✓] Flutter (Channel master, 2.11.0-0.0.pre.683, on KDE neon User - Plasma 25th Anniversary Edition 5.11.0-46-generic, locale en_US.UTF-8)
    • Flutter version 2.11.0-0.0.pre.683 at /opt/flutter
    • Upstream repository https://github.com/flutter/flutter
    • Framework revision fd71de13fd (3 days ago), 2022-02-25 16:06:15 +0200
    • Engine revision 1012ac4b5a
    • Dart version 2.17.0 (build 2.17.0-141.0.dev)
    • DevTools version 2.11.0

[!] Android toolchain - develop for Android devices
    • Android SDK at /opt
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.

    ✗ No valid Android SDK platforms found in /opt/platforms. Directory was empty.
    • Try re-installing or updating your Android SDK,
      visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions.

[✓] Chrome - develop for the web
    • CHROME_EXECUTABLE = /home/spiral/Downloads/ungoogled-chromium_98.0.4758.102-1.1.AppImage

[✓] Linux toolchain - develop for Linux desktop
    • clang version 10.0.0-4ubuntu1
    • cmake version 3.22.1
    • ninja version 1.10.0
    • pkg-config version 0.29.1

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions).

[✓] VS Code (version 1.63.2)
    • VS Code at /usr/share/code
    • Flutter extension version 3.34.0

[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • KDE neon User - Plasma 25th Anniversary Edition 5.11.0-46-generic
    • Chrome (web)    • chrome • web-javascript • Chromium 98.0.4758.102

[✓] HTTP Host Availability
    • All required HTTP hosts are available

! Doctor found issues in 2 categories.

FWIW, it doesn't seem that this error impacts app functionality at all, other than spamming my logs.

[maheshj01]

Hi @spiralw, thanks for filing the issue. I created a new sample project on the master channel and ran the counter app and pressed the windows/super key but I could not reproduce any error in the console.

On a side note pressing the super key brings in all the other open windows which means this will lose focus from the flutter app, So I suspect the error that you are reproducing could be due to some other key or event and not due to the super key.

mahesh@mahesh:~/Downloads/key_test$ flutterm run -d chrome
Running "flutter pub get" in key_test...                         1,002ms
Launching lib/main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...             13.2s
DartUri: Unresolved uri: dart:web_sql
DartUri: Unresolved uri: dart:ui
This app is linked to the debug service: ws://127.0.0.1:44549/6kk9GQilfBo=/ws
Debug service listening on ws://127.0.0.1:44549/6kk9GQilfBo=/ws

💪 Running with sound null safety 💪

🔥  To hot restart changes while running, press "r" or "R".
For a more detailed help message, press "h". To quit, press "q".

An Observatory debugger and profiler on Chrome is available at: http://127.0.0.1:44549/6kk9GQilfBo=
The Flutter DevTools debugger and profiler on Chrome is available at: http://127.0.0.1:9101?uri=http://127.0.0.1:44549/6kk9GQilfBo=

flutter doctor -v (Linux)

[✓] Flutter (Channel master, 2.11.0-0.0.pre.633, on Ubuntu 20.04.4 LTS 5.13.0-30-generic, locale en_GB.UTF-8)
    • Flutter version 2.11.0-0.0.pre.633 at /home/mahesh/Development/master
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 54a9d65282 (10 days ago), 2022-02-19 10:09:26 -0800
    • Engine revision f6ea6186ee
    • Dart version 2.17.0 (build 2.17.0-125.0.dev)
    • DevTools version 2.11.0

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /home/mahesh/Android/Sdk
    • Platform android-31, build-tools 31.0.0
    • Java binary at: /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • clang version 10.0.0-4ubuntu1
    • cmake version 3.16.3
    • ninja version 1.10.0
    • pkg-config version 0.29.1

[✓] Android Studio (version 2020.3)
    • Android Studio at /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio
    • Flutter plugin version 63.2.1
    • Dart plugin version 203.8452
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[✓] VS Code (version 1.64.2)
    • VS Code at /usr/share/code
    • Flutter extension version 3.34.0

[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 20.04.4 LTS 5.13.0-30-generic
    • Chrome (web)    • chrome • web-javascript • Google Chrome 98.0.4758.102

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

I also tried upgrading to latest master Flutter (Channel master, 2.11.0-0.0.pre.716), but I still couldn't reproduce it.

FWIW, it doesn't seem that this error impacts app functionality at all, other than spamming my logs.

It might lock certain keys, You might notice this when typing in a textfield.

• this error happens on physical keydown rather than keyup so I don't think it's losing focus
• I thought it might be an issue with my ungoogled-chromium, so I installed Chrome from chrome.google.com download page
• I thought it might be a Wayland issue, so I tried it on Xorg.
• I thought it might be a KDE Plasma issue, so I installed dwm (dwm uses alt instead of super for WM controls)

The error still happens in all the above cases.
I'm not quite sure how to debug this further, what would you suggest?

[maheshj01]

Thanks for the info I was able to reproduce a similar error, The error reproduces instantly if you press ctrl+ super key and is not reproducible by pressing just super key. Could you please recheck the reproducible steps and confirm if this is the same case for you

Reproducible steps

• Run a flutter web app with flutter run -d chrome
• Wait for the app to load and focus to app window
• press super key (does not reproduce any error)
• press ctrl + super key error reproduces

logs

mahesh@mahesh:~/Downloads/key_test$ flutterm run -d chrome
Launching lib/main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...             13.9s
DartUri: Unresolved uri: dart:web_sql
DartUri: Unresolved uri: dart:ui
This app is linked to the debug service: ws://127.0.0.1:33103/f5WOT9R0VKU=/ws
Debug service listening on ws://127.0.0.1:33103/f5WOT9R0VKU=/ws

💪 Running with sound null safety 💪

🔥  To hot restart changes while running, press "r" or "R".
For a more detailed help message, press "h". To quit, press "q".

An Observatory debugger and profiler on Chrome is available at: http://127.0.0.1:33103/f5WOT9R0VKU=
The Flutter DevTools debugger and profiler on Chrome is available at: http://127.0.0.1:9101?uri=http://127.0.0.1:33103/f5WOT9R0VKU=
Error: Assertion failed: file:///home/mahesh/Development/master/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
_pressedKeys.containsKey(event.physicalKey)
"A KeyUpEvent is dispatched, but the state shows that the physical key is not pressed. If this occurs in real application, please report this bug to Flutter. If this occurs in unit
tests, please ensure that simulated events follow Flutter's event model as documented in `HardwareKeyboard`. This was the event: KeyUpEvent#585e6(physicalKey:
PhysicalKeyboardKey#700e3(usbHidUsage: \"0x000700e3\", debugName: \"Meta Left\"), logicalKey: LogicalKeyboardKey#4b191(keyId: \"0x200000106\", keyLabel: \"Meta Left\", debugName:
\"Meta Left\"), character: null, timeStamp: 0:00:12.397100, synthesized)"
    at Object.throw_ [as throw] (http://localhost:42563/dart_sdk.js:5065:11)
    at Object.assertFailed (http://localhost:42563/dart_sdk.js:4990:15)
    at http://localhost:42563/packages/flutter/src/services/restoration.dart.lib.js:5398:74
    at hardware_keyboard.HardwareKeyboard.new.[_assertEventIsRegular] (http://localhost:42563/packages/flutter/src/services/restoration.dart.lib.js:5404:26)
    at hardware_keyboard.HardwareKeyboard.new.handleKeyEvent (http://localhost:42563/packages/flutter/src/services/restoration.dart.lib.js:5458:34)
    at hardware_keyboard.KeyEventManager.new.handleKeyData (http://localhost:42563/packages/flutter/src/services/restoration.dart.lib.js:5609:38)
    at http://localhost:42563/dart_sdk.js:171433:47
    at Object.invoke (http://localhost:42563/dart_sdk.js:190794:7)
    at _engine.EnginePlatformDispatcher.__.invokeOnKeyData (http://localhost:42563/dart_sdk.js:171433:17)
    at _engine.KeyboardBinding.__.[_onKeyData] (http://localhost:42563/dart_sdk.js:170125:49)
    at http://localhost:42563/dart_sdk.js:170488:21
    at http://localhost:42563/dart_sdk.js:170463:51
    at IdentityMap.new.removeWhere (http://localhost:42563/dart_sdk.js:23228:15)
    at http://localhost:42563/dart_sdk.js:170461:47
    at IdentityMap.from.forEach (http://localhost:42563/dart_sdk.js:27724:11)
    at _engine.KeyboardConverter.new.[_handleEvent] (http://localhost:42563/dart_sdk.js:170459:53)
    at _engine.KeyboardConverter.new.handleEvent (http://localhost:42563/dart_sdk.js:170491:27)
    at http://localhost:42563/dart_sdk.js:170131:76
    at loggedHandler (http://localhost:42563/dart_sdk.js:170108:18)
══╡ EXCEPTION CAUGHT BY SERVICES LIBRARY ╞══════════════════════════════════════════════════════════
The following assertion was thrown during a platform message callback:
Assertion failed:
file:///home/mahesh/Development/master/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
_pressedKeys.containsKey(event.physicalKey)
"A KeyUpEvent is dispatched, but the state shows that the physical key is not pressed. If this
occurs in real application, please report this bug to Flutter. If this occurs in unit tests, please
ensure that simulated events follow Flutter's event model as documented in `HardwareKeyboard`. This
was the event: KeyUpEvent#75aee(physicalKey: PhysicalKeyboardKey#700e3(usbHidUsage: \"0x000700e3\",
debugName: \"Meta Left\"), logicalKey: LogicalKeyboardKey#4b191(keyId: \"0x200000106\", keyLabel:
\"Meta Left\", debugName: \"Meta Left\"), character: null, timeStamp: 0:00:12.741100)"

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 29:3    assertFailed
packages/flutter/src/services/hardware_keyboard.dart 441:46                   <fn>
packages/flutter/src/services/hardware_keyboard.dart 451:14                   [_assertEventIsRegular]
packages/flutter/src/services/hardware_keyboard.dart 544:5                    handleKeyEvent
packages/flutter/src/services/hardware_keyboard.dart 867:57                   handleRawKeyMessage
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54            runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5            _async
packages/flutter/src/services/hardware_keyboard.dart 854:51                   handleRawKeyMessage
packages/flutter/src/services/platform_channel.dart 77:49                     <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54            runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5            _async
packages/flutter/src/services/platform_channel.dart 76:58                     <fn>
packages/flutter/src/services/binding.dart 380:35                             <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54            runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5            _async
packages/flutter/src/services/binding.dart 377:98                             <fn>
lib/_engine/engine/platform_dispatcher.dart 1091:13                           invoke2
lib/ui/channel_buffers.dart 25:12                                             invoke
lib/ui/channel_buffers.dart 65:7                                              push
lib/ui/channel_buffers.dart 130:16                                            push
lib/_engine/engine/platform_dispatcher.dart 305:25                            invokeOnPlatformMessage
lib/_engine/engine/keyboard.dart 130:39                                       [_handleHtmlEvent]
lib/_engine/engine/keyboard.dart 37:7                                         <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
Another exception was thrown: Assertion failed: file:///home/mahesh/Development/master/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
Another exception was thrown: Assertion failed: file:///home/mahesh/Development/master/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16
Another exception was thrown: Assertion failed: file:///home/mahesh/Development/master/packages/flutter/lib/src/services/hardware_keyboard.dart:441:16

flutter doctor -v (Linux)

[✓] Flutter (Channel stable, 2.10.2, on Ubuntu 20.04.3 LTS 5.13.0-28-generic, locale en_GB.UTF-8)
    • Flutter version 2.10.2 at /home/mahesh/Development/stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 097d3313d8 (9 days ago), 2022-02-18 19:33:08 -0600
    • Engine revision a83ed0e5e3
    • Dart version 2.16.1
    • DevTools version 2.9.2

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /home/mahesh/Android/Sdk
    • Platform android-31, build-tools 31.0.0
    • Java binary at: /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • clang version 10.0.0-4ubuntu1
    • cmake version 3.16.3
    • ninja version 1.10.0
    • pkg-config version 0.29.1

[✓] Android Studio (version 2020.3)
    • Android Studio at /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio
    • Flutter plugin version 63.2.1
    • Dart plugin version 203.8452
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[✓] VS Code (version 1.63.2)
    • VS Code at /usr/share/code
    • Flutter extension version 3.34.0

[✓] Connected device (3 available)
    • Android SDK built for x86 (mobile) • emulator-5556 • android-x86    • Android 11 (API 30) (emulator)
    • Linux (desktop)                    • linux         • linux-x64      • Ubuntu 20.04.3 LTS 5.13.0-28-generic
    • Chrome (web)                       • chrome        • web-javascript • Google Chrome 97.0.4692.99

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

[✓] Flutter (Channel master, 2.11.0-0.0.pre.716, on Ubuntu 20.04.4 LTS 5.13.0-30-generic, locale en_GB.UTF-8)
    • Flutter version 2.11.0-0.0.pre.716 at /home/mahesh/Development/master
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision e85ba6eeae (23 hours ago), 2022-02-28 23:31:20 -0800
    • Engine revision 615a60512c
    • Dart version 2.17.0 (build 2.17.0-150.0.dev)
    • DevTools version 2.11.1

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /home/mahesh/Android/Sdk
    • Platform android-31, build-tools 31.0.0
    • Java binary at: /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • clang version 10.0.0-4ubuntu1
    • cmake version 3.16.3
    • ninja version 1.10.0
    • pkg-config version 0.29.1

[✓] Android Studio (version 2020.3)
    • Android Studio at /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio
    • Flutter plugin version 63.2.1
    • Dart plugin version 203.8452
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[✓] VS Code (version 1.64.2)
    • VS Code at /usr/share/code
    • Flutter extension version 3.34.0

[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 20.04.4 LTS 5.13.0-30-generic
    • Chrome (web)    • chrome • web-javascript • Google Chrome 98.0.4758.102

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

hey, I am still able to reproduce this in my environment without the ctrl key, so I installed ubuntu 20.04.3 as per your flutter doctor output. I see now that GNOME removes focus from the app on keydown rather than KDE's keyup, so that is why you were not able to reproduce the error without the ctrl key. hope that helps

[maheshj01]

Thanks for the update leaving this issue open for further investigation from the team.