Component.removeWhere throwing Concurrent modification during iteration Exception

[trunghq3101]

Current bug behavior

In the onLoad of a component that has just been pushed to the router, I call the removeWhere() function on an unmounted component. It throws this exception:

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Concurrent modification during iteration: _Set len:1.

Expected behavior

It worked fine on flame: 1.6.0

Steps to reproduce

Flutter doctor output

Output of: flutter doctor -v

More environment information

• Flame version: main
• Platform affected: desktop

Log information

#2      Component.removeWhere
component.dart:617
#3      Level1OpeningScene.call.hidePlaygroundAndRunButon
level_1_opening_scene.dart:44
#4      Level1OpeningScene.call
level_1_opening_scene.dart:48
#5      Level1.onLoad
level_1.dart:67
#6      Component._startLoading
component.dart:824
#7      Component._addChild
component.dart:591
#8      Component.addToParent
component.dart:562
#9      Route.didPush
route.dart:137
#10     RouterComponent.pushNamed
router_component.dart:106
#11     new HomePage.<anonymous closure>
home_page.dart:10
#12     ButtonComponent.onTapDown
button_component.dart:6

More information

[spydon]

@st-pasha this is a regression right, and not intentional?

[spydon]

@trunghq3101 I'm failing to reproduce, this but I'm probably doing something wrong. Could you post a MRE for this one?

[spydon]

Okay, managed to do a MRE. It's not related to the router.
https://zapp.run/edit/flame-z91s06gva1t0?entry=lib/main.dart&file=lib/main.dart

import 'package:flame/components.dart';
import 'package:flame/game.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(
    GameWidget(
      game: FlameGame(children: [RemoveWhereComponent()]),
    ),
  );
}

class RemoveWhereComponent extends Component {
  @override
  Future<void> onLoad() async {
    add(Component());
    removeWhere((_) => true);
  }
}

[spydon]

After yet another git bisect, #2300 shows to be the culprit.