🐛 Widget Inspector throws error on TreeView

[pamtbaau]

Describe the bug
A clear and concise description of what the bug is.

When showing a TreeView, the Widget Inspector throw an error

To Reproduce
Steps to reproduce the behavior:

• Create a default Windows desktop app
• Add fluent_ui as dependency

  dependencies:
    flutter:
      sdk: flutter
  
    fluent_ui:
      git: https://github.com/bdlukaa/fluent_ui.git
  

• Use the following main.dart

  import 'package:fluent_ui/fluent_ui.dart';
  
  void main() {
    WidgetsFlutterBinding.ensureInitialized();
  
    runApp(const MyApp());
  }
  
  class MyApp extends StatelessWidget {
    const MyApp({super.key});
  
    @override
    Widget build(BuildContext context) {
      return FluentApp(
        title: 'Flutter Demo',
        home: NavigationView(
          pane: NavigationPane(
            selected: 1,
            displayMode: PaneDisplayMode.compact,
            items: [
              PaneItem(
                icon: const Icon(FluentIcons.dashboard_add),
                title: const Text('TreeView test'),
                body: const MyHomePage(),
              ),
            ],
          ),
        ),
      );
    }
  }
  
  class MyHomePage extends StatelessWidget {
    const MyHomePage({super.key});
  
    @override
    Widget build(BuildContext context) {
      return TreeView(
        items: [
          _createTagTree(),
        ],
      );
    }
  
    TreeViewItem _createTagTree() {
      return TreeViewItem(
        expanded: true,
        content: const Text('root'),
        value: null,
        selected: false,
        children: [
          TreeViewItem(
            expanded: true,
            content: const Text('Tag 1'),
            value: 1,
            selected: false,
            children: [],
          ),
          TreeViewItem(
            expanded: true,
            content: const Text('Tag 2'),
            value: 2,
            selected: false,
            children: [],
          ),
          TreeViewItem(
            expanded: true,
            content: const Text('Tag 2'),
            value: 3,
            selected: false,
            children: [],
          ),
        ],
      );
    }
  }
  

• In VScode, open Widget Inspector

  • No widget tree is shown in Inspector

  • Error is thrown in Debug Console

    The following assertion was thrown during a service extension callback for "ext.flutter.inspector.getRootWidgetSummaryTreeWithPreviews":
    'package:flutter/src/foundation/diagnostics.dart': Failed assertion: line 2091 pos 15: 'ifTrue != null || ifFalse != null': is not true.

    When the exception was thrown, this was the stack:
    #2 new FlagProperty (package:flutter/src/foundation/diagnostics.dart:2091:15) diagnostics.dart:2091
    #3 TreeView.debugFillProperties (package:fluent_ui/src/controls/navigation/tree_view.dart:655:13) tree_view.dart:655
    #4 etc.

Expected behavior
I would expect to see a widget tree inside the Widget Inspector

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Add any other context about the problem here.

[pamtbaau]

Thanks, it's working!

Question though...

• Shouldn't the children of a TreeView be a TreeViewItem?