'package:flutter/src/widgets/scroll_activity.dart': Failed assertion: line 464 pos 12: 'lastDetails is DragUpdateDetails': is not true.

I have a crash on iOS (only) with DropdownButtonFormField and I followed the trace back to the StoreConnector Widget.

It does not happen if the list is short and you don't have to scroll. If your emulator or device has a large screen, you might have to add names to the list so it is forced to scroll...

Here is a simple example it happens with

import 'package:flutter/material.dart';

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

  @override
  _DropTestState createState() => _DropTestState();
}

class _DropTestState extends State<DropTest> {
  String name = 'john';

  List<DropdownMenuItem<String>> _buildItems() {
    List options = ['john', 'lisa', 'robert', 'marie', 'jane', 'bruce', 'elton', 'june', 'raph', 'margot'];
    List<DropdownMenuItem<String>> items = [];
    options.forEach((name) {
      items.add(DropdownMenuItem<String>(
        value: name,
        child: Text(name),
      ));
    });

    return items;
  }

  @override
  Widget build(BuildContext context) {
    return DropdownButtonFormField<String>(
      items: _buildItems(),
      onChanged: (value) async {
        setState(() {
          this.name = value!;
          print(this.name);
        });
      },
      value: this.name,
      validator: (value) => value == null ? 'Please fill in your name' : null,
    );
  }
}

So this does not work. It produces the crash...

class MyApp extends StatelessWidget {
    return StoreConnector(
      converter: (Store<AppState> store) => store.state,
      builder: (BuildContext context, AppState state) {

        return GestureDetector(
          onTap: () {
            // Close keyboard on touch anywhere
            FocusManager.instance.primaryFocus?.unfocus();
          },
          child: OverlaySupport(
            child: MaterialApp(
              title: 'xxx,
              theme: AppTheme.theme,
              debugShowCheckedModeBanner: false,
              localizationsDelegates: localizationsDelegates,
              supportedLocales: [
                const Locale('en', 'EN'),
                const Locale('fr', 'FR'),
              ],
              navigatorKey: App.navKey,
              navigatorObservers: [BotToastNavigatorObserver()],
              builder: BotToastInit(),
              initialRoute: state.user.id != 0 ? state.meta.route : '/login',
              onGenerateRoute: RouteManager.generateRoute,
            ),
          ),
        );
      },
    );
  }
}

and when I remove the StoreConnector widget, it does work...

class MyApp extends StatelessWidget {
        return GestureDetector(
          onTap: () {
            // Close keyboard on touch anywhere
            FocusManager.instance.primaryFocus?.unfocus();
          },
          child: OverlaySupport(
            child: MaterialApp(
              title: 'xxx,
              theme: AppTheme.theme,
              debugShowCheckedModeBanner: false,
              localizationsDelegates: localizationsDelegates,
              supportedLocales: [
                const Locale('en', 'EN'),
                const Locale('fr', 'FR'),
              ],
              navigatorKey: App.navKey,
              navigatorObservers: [BotToastNavigatorObserver()],
              builder: BotToastInit(),
              initialRoute: '/login',
              onGenerateRoute: RouteManager.generateRoute,
            ),
          ),
        );
  }
}

So I found the origin but I have no idea why it makes it crash...

Logs

``` async_redux: ^13.0.4 ``` ``` flutter: [2021-09-22 09:33:10.527290 | Catcher | INFO] ---------- ERROR ---------- flutter: [2021-09-22 09:33:10.528323 | Catcher | INFO] 'package:flutter/src/widgets/scroll_activity.dart': Failed assertion: line 464 pos 12: 'lastDetails is DragUpdateDetails': is not true. flutter: [2021-09-22 09:33:10.528883 | Catcher | INFO] flutter: [2021-09-22 09:33:10.530365 | Catcher | INFO] ------- STACK TRACE ------- flutter: [2021-09-22 09:33:10.531266 | Catcher | INFO] #0 _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:46:39) flutter: [2021-09-22 09:33:10.531488 | Catcher | INFO] #1 _AssertionError._throwNew (dart:core-patch/errors_patch.dart:36:5) flutter: [2021-09-22 09:33:10.531685 | Catcher | INFO] #2 DragScrollActivity.dispatchScrollUpdateNotification package:flutter/…/widgets/scroll_activity.dart:464 flutter: [2021-09-22 09:33:10.531920 | Catcher | INFO] #3 ScrollPosition.didUpdateScrollPositionBy package:flutter/…/widgets/scroll_position.dart:899 flutter: [2021-09-22 09:33:10.532291 | Catcher | INFO] #4 RawScrollbarState._maybeTriggerScrollbar. package:flutter/…/widgets/scrollbar.dart:1243 flutter: [2021-09-22 09:33:10.533119 | Catcher | INFO] #5 SchedulerBinding._invokeFrameCallback package:flutter/…/scheduler/binding.dart:1143 flutter: [2021-09-22 09:33:10.533522 | Catcher | INFO] #6 SchedulerBinding.handleDrawFrame package:flutter/…/scheduler/binding.dart:1088 flutter: [2021-09-22 09:33:10.533638 | Catcher | INFO] #7 SchedulerBinding._handleDrawFrame package:flutter/…/scheduler/binding.dart:996 flutter: [2021-09-22 09:33:10.534724 | Catcher | INFO] #8 _rootRun (dart:async/zone.dart:1428:13) flutter: [2021-09-22 09:33:10.535030 | Catcher | INFO] #9 _CustomZone.run (dart:async/zone.dart:1328:19) flutter: [2021-09-22 09:33:10.535419 | Catcher | INFO] #10 _CustomZone.runGuarded (dart:async/zone.dart:1236:7) flutter: [2021-09-22 09:33:10.535836 | Catcher | INFO] #11 _invoke (dart:ui/hooks.dart:166:10) flutter: [2021-09-22 09:33:10.536175 | Catcher | INFO] #12 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:270:5) flutter: [2021-09-22 09:33:10.536580 | Catcher | INFO] #13 _drawFrame (dart:ui/hooks.dart:129:31) ``` ``` [✓] Flutter (Channel stable, 2.5.1, on macOS 11.5.2 20G95 darwin-arm, locale fr-FR) • Flutter version 2.5.1 at /Users/rgr/Documents/flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision ffb2ecea52 (4 days ago), 2021-09-17 15:26:33 -0400 • Engine revision b3af521a05 • Dart version 2.14.2 [✗] Android toolchain - develop for Android devices • Android SDK at /Users/rgr/Library/Android/sdk ✗ cmdline-tools component is missing Run `path/to/sdkmanager --install "cmdline-tools;latest"` See https://developer.android.com/studio/command-line for more details. [✓] Xcode - develop for iOS and macOS • Xcode at /Applications/Xcode.app/Contents/Developer • Xcode 12.5.1, Build version 12E507 • CocoaPods version 1.11.0 [✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome [!] 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/macos#android-setup for detailed instructions). [✓] VS Code (version 1.60.1) • VS Code at /Applications/Visual Studio Code.app/Contents • Flutter extension version 3.26.0 [✓] Connected device (2 available) • iPhone de Raphaël (mobile) • 555e5664f6e9a581deba0a0f33dd56436e9a4d1a • ios • iOS 14.7.1 18G82 • Chrome (web) • chrome • web-javascript • Google Chrome 93.0.4577.82 ! Doctor found issues in 2 categories. ```

marcglasberg / async_redux

'package:flutter/src/widgets/scroll_activity.dart': Failed assertion: line 464 pos 12: 'lastDetails is DragUpdateDetails': is not true. #115