No ScrollPosition attached error message when widget is no more rebuild with a horizontal scrollbar

[caduandrade]

I know I can keep a ScrollBar always built around my Widget. However, my application has a complex requirement that the Widget is sometimes built alone and sometimes with a ScrollBar around it. The application simulates a Scrollbar "outside" the content. But to simplify the error, I created an example without this complexity.

Steps to Reproduce

1. Decrease the window width to less than 800 pixels. (The ScrollBar will be built around the Widget).
2. Increase the window width to greater than 800 pixels. (The ScrollBar will no longer be built).
3. The moment the Scrollbar stops being built, the error message appears.

Code

import 'package:flutter/material.dart';

void main() {
  runApp(const ExampleApp());
}

class ExampleApp extends StatelessWidget {
  const ExampleApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  final ScrollController _scrollController = ScrollController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(body: LayoutBuilder(builder: (context, constraints) {
      const double width = 800;
      Widget content = const SizedBox(width: width, child: Placeholder());
      if (width <= constraints.maxWidth) {
        // I don't need scroll. I fit on the screen.
        // I know I could keep the scrollbar building and it would handle
        // this simple case. But in my application it is important
        // that it is not built.
        return content;
      }
      return Scrollbar(
          controller: _scrollController,
          thumbVisibility: true,
          child: SingleChildScrollView(
              child: content,
              controller: _scrollController,
              scrollDirection: Axis.horizontal));
    }));
  }
}

flutter run --verbose

[  +72 ms] executing: uname -m
[  +31 ms] Exit code 0 from: uname -m
[        ] x86_64
[   +5 ms] executing: [/cadu/desenv/flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +4 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] ee4e09cce01d6f2d7f4baebd247fde02e5008851
[        ] executing: [/cadu/desenv/flutter/] git tag --points-at ee4e09cce01d6f2d7f4baebd247fde02e5008851
[  +13 ms] Exit code 0 from: git tag --points-at ee4e09cce01d6f2d7f4baebd247fde02e5008851
[        ] 3.0.0
[   +8 ms] executing: [/cadu/desenv/flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[   +4 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/stable
[        ] executing: [/cadu/desenv/flutter/] git ls-remote --get-url origin
[   +4 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[  +76 ms] executing: [/cadu/desenv/flutter/] git rev-parse --abbrev-ref HEAD
[   +4 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] stable
[  +50 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.
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[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +62 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.
[  +74 ms] Skipping pub get: version match.
[ +111 ms] Generating /cadu/easy_table_flutter/example/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
[ +163 ms] Launching lib/main2.dart on Chrome in debug mode...
[ +140 ms] Updating assets
Waiting for connection from debug service on Chrome...
[ +151 ms] <- reset
[   +7 ms] /cadu/desenv/flutter/bin/cache/dart-sdk/bin/dart --disable-dart-dev /cadu/desenv/flutter/bin/cache/dart-sdk/bin/snapshots/frontend_server.dart.snapshot --sdk-root /cadu/desenv/flutter/bin/cache/flutter_web_sdk/ --incremental --target=dartdevc --debugger-module-names --experimental-emit-debug-metadata -Dflutter.inspector.structuredErrors=true -DFLUTTER_WEB_AUTO_DETECT=true --output-dill /tmp/flutter_tools.BWNYZA/flutter_tool.WOVLES/app.dill --libraries-spec file:///cadu/desenv/flutter/bin/cache/flutter_web_sdk/libraries.json --packages /cadu/easy_table_flutter/example/.dart_tool/package_config.json -Ddart.vm.profile=false -Ddart.vm.product=false --enable-asserts --track-widget-creation --filesystem-root /tmp/flutter_tools.BWNYZA/flutter_tools.NCENYX --filesystem-scheme org-dartlang-app --initialize-from-dill build/9da3ff2a5297e0c47025236ff84e71f4.cache.dill.track.dill --platform file:///cadu/desenv/flutter/bin/cache/flutter_web_sdk/kernel/flutter_ddc_sdk_sound.dill --sound-null-safety
[   +7 ms] <- compile org-dartlang-app:/web_entrypoint.dart
[+17488 ms] Synced 29.9MB.
[        ] <- accept
[        ] Caching compiled dill
[  +47 ms] Using Google Chrome 101.0.4951.64 

[ +162 ms] executing: uname -m
[   +5 ms] Exit code 0 from: uname -m
[        ] x86_64
[ +486 ms] [CHROME]: libva error: /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so init failed
[        ] [CHROME]: libva error: /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so init failed
[   +5 ms] [CHROME]: 
[        ] [CHROME]: DevTools listening on ws://127.0.0.1:46673/devtools/browser/ca81aef4-9dc3-43cb-86b7-c5ab877e7b23
[ +200 ms] DwdsInjector: Received request for entrypoint at http://localhost:45937/main_module.bootstrap.js
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/widgets/orientation_builder.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/widgets/icon_theme.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/widgets/icon.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/widgets/icon_data.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/widgets/animated_list.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/material/typography.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/material/colors.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/material/constants.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/cupertino.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/cupertino/tab_view.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/cupertino/route.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/cupertino/app.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/cupertino/scrollbar.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/cupertino/tab_scaffold.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/material/bottom_app_bar.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/material/autocomplete.dart
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[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/material/app.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/material/animated_icons.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/material/about.dart
[        ] MetadataProvider: Loaded debug metadata (sound null safety)
[   +5 ms] DwdsInjector: Injected debugging metadata for entrypoint at http://localhost:45937/main_module.bootstrap.js
[+2413 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: true
[  +70 ms] DevHandler: Debug service listening on ws://127.0.0.1:41905/E2x3obilqGw=/ws

[  +17 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}}}}
[   +3 ms] This app is linked to the debug service: ws://127.0.0.1:41905/E2x3obilqGw=/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}}}}
[   +1 ms] 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}}}}
[   +3 ms] Debug service listening on ws://127.0.0.1:41905/E2x3obilqGw=/ws
[        ] 💪 Running with sound null safety 💪
Debug service listening on ws://127.0.0.1:41905/E2x3obilqGw=/ws
[  +28 ms] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 15, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 15, params: {streamId: Debug, includePrivateMembers: false}}}}
[   +2 ms] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 18, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 18, params: {streamId: Extension, includePrivateMembers: false}}}}
[   +8 ms] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 19, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 19, params: {streamId: Isolate, includePrivateMembers: false}}}}
[   +1 ms] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 21, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 21, params: {streamId: Logging, includePrivateMembers: false}}}}
[ +235 ms] Flutter Web Bootstrap: Auto

======== Exception caught by scheduler library =====================================================
The following assertion was thrown during a scheduler callback:
The Scrollbar's ScrollController has no ScrollPosition attached.

A Scrollbar cannot be painted without a ScrollPosition. 

The Scrollbar attempted to use the provided ScrollController. This ScrollController should be associated with the ScrollView that the Scrollbar is being applied to. When providing your own ScrollController, ensure both the Scrollbar and the Scrollable widget use the same one.

When the exception was thrown, this was the stack: 
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
packages/flutter/src/widgets/scrollbar.dart 1475:9                            <fn>
packages/flutter/src/widgets/scrollbar.dart 1499:14                           [_debugCheckHasValidScrollPosition]
packages/flutter/src/widgets/scrollbar.dart 1431:14                           <fn>
packages/flutter/src/scheduler/binding.dart 1146:15                           [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1091:9                            handleDrawFrame
packages/flutter/src/scheduler/binding.dart 997:5                             [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1090:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 160:5                             invokeOnDrawFrame
lib/_engine/engine/initialization.dart 194:45                                 <fn>
====================================================================================================

flutter analyze

Nothing

flutter doctor -v

[✓] Flutter (Channel stable, 3.0.0, on Ubuntu 20.04.4 LTS 5.13.0-41-generic, locale en_US.UTF-8)
    • Flutter version 3.0.0 at /cadu/desenv/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ee4e09cce0 (7 days ago), 2022-05-09 16:45:18 -0700
    • Engine revision d1b9a6938a
    • Dart version 2.17.0
    • DevTools version 2.12.2

[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
    • Android SDK at /home/cadu/Android/Sdk
    • Platform android-32, build-tools 32.0.0
    • ANDROID_SDK_ROOT = /home/cadu/Android/Sdk
    • Java binary at: /cadu/desenv/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
    • 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 2021.2)
    • Android Studio at /cadu/desenv/android-studio
    • Flutter plugin version 67.1.2
    • Dart plugin version 212.5744
    • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)

[✓] IntelliJ IDEA Community Edition (version 2021.2)
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    • Flutter plugin can be installed from:
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[✓] VS Code (version 1.67.1)
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[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 20.04.4 LTS 5.13.0-41-generic
    • Chrome (web)    • chrome • web-javascript • Google Chrome 101.0.4951.64

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• No issues found!

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