TextStyle.lerp throw assert error when typography is changed from/to Typography.material2018

[SuperPenguin]

Steps to Reproduce

1. Run example code
2. Tap Material 3, then tap Material 1
3. Tap Material 2, then tap Material 1/3, then tap again to Material 2

Expected results: No error

Actual results: TextStyle.lerp throw assertion error

Code sample

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

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

enum AppMode {
  material1(label: 'Material 1'),
  material2(label: 'Material 2'),
  material3(label: 'Material 3');

  const AppMode({required this.label});

  final String label;
}

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

  @override
  State<App> createState() => AppState();

  static AppState stateOf(BuildContext context) {
    return context.findAncestorStateOfType<AppState>()!;
  }
}

class AppState extends State<App> {
  AppMode _appMode = AppMode.values.first;

  void setAppMode(AppMode appMode) {
    if (_appMode != appMode) {
      setState(() {
        _appMode = appMode;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        brightness: Brightness.light,
        useMaterial3: _appMode == AppMode.material3,
        typography: _appMode == AppMode.material3
            ? Typography.material2021(platform: defaultTargetPlatform)
            : _appMode == AppMode.material2
                ? Typography.material2018(platform: defaultTargetPlatform)
                : Typography.material2014(platform: defaultTargetPlatform),
      ),
      home: const HomeScreen(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Column(
          children: [
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                for (final m in AppMode.values)
                  Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 4.0),
                    child: ElevatedButton(
                      onPressed: () => App.stateOf(context).setAppMode(m),
                      child: Text(m.label),
                    ),
                  ),
              ],
            ),
            const Expanded(
              child: TextThemeShowcase(),
            ),
          ],
        ),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    final textTheme = Theme.of(context).textTheme;
    final infos = TextStyleInfo.listFromTextTheme(textTheme);

    return ListView.builder(
      itemCount: infos.length,
      itemBuilder: (context, index) {
        final textInfo = infos[index];

        return Card(
          child: Padding(
            padding: const EdgeInsets.all(16.0),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Text(textInfo.name, style: textInfo.style),
                Text('FontSize: ${textInfo.style?.fontSize}'),
                Text('FontWeight: ${textInfo.style?.fontWeight}'),
              ],
            ),
          ),
        );
      },
    );
  }
}

@immutable
class TextStyleInfo {
  const TextStyleInfo({
    required this.name,
    required this.style,
  });

  final String name;
  final TextStyle? style;

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;

    return other.runtimeType == runtimeType &&
        other is TextStyleInfo &&
        other.name == name &&
        other.style == style;
  }

  @override
  int get hashCode => Object.hash(runtimeType, name, style);

  static List<TextStyleInfo> listFromTextTheme(TextTheme textTheme) {
    return [
      // Display
      TextStyleInfo(name: 'Display Large', style: textTheme.displayLarge),
      TextStyleInfo(name: 'Display Medium', style: textTheme.displayMedium),
      TextStyleInfo(name: 'Display Small', style: textTheme.displaySmall),
      // Headline
      TextStyleInfo(name: 'Headline Large', style: textTheme.headlineLarge),
      TextStyleInfo(name: 'Headline Medium', style: textTheme.headlineMedium),
      TextStyleInfo(name: 'Headline Small', style: textTheme.headlineSmall),
      // Title
      TextStyleInfo(name: 'Title Large', style: textTheme.titleLarge),
      TextStyleInfo(name: 'Title Medium', style: textTheme.titleMedium),
      TextStyleInfo(name: 'Title Small', style: textTheme.titleSmall),
      // Label
      TextStyleInfo(name: 'Label Large', style: textTheme.labelLarge),
      TextStyleInfo(name: 'Label Medium', style: textTheme.labelMedium),
      TextStyleInfo(name: 'Label Small', style: textTheme.labelSmall),
      // Body
      TextStyleInfo(name: 'Body Large', style: textTheme.bodyLarge),
      TextStyleInfo(name: 'Body Medium', style: textTheme.bodyMedium),
      TextStyleInfo(name: 'Body Small', style: textTheme.bodySmall),
    ];
  }
}

Logs

════════ Exception caught by widgets library ═══════════════════════════════════
The following assertion was thrown building AnimatedTheme(duration: 200ms, dirty, state: _AnimatedThemeState#dd243(ticker active, ThemeDataTween(ThemeData#1ae13 → ThemeData#87eb2))):
'package:flutter/src/painting/text_style.dart': Failed assertion: line 1047 pos 12: 'a == null || b == null || a.inherit == b.inherit': is not true.
package:flutter/…/painting/text_style.dart:1047
2

Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md

The relevant error-causing widget was
MaterialApp
lib/main.dart:42
When the exception was thrown, this was the stack
#2      TextStyle.lerp
package:flutter/…/painting/text_style.dart:1047
#3      TextTheme.lerp
package:flutter/…/material/text_theme.dart:615
#4      Typography.lerp
package:flutter/…/material/typography.dart:317
#5      ThemeData.lerp
package:flutter/…/material/theme_data.dart:2068
#6      ThemeDataTween.lerp
package:flutter/…/material/theme.dart:176
#7      Tween.transform
package:flutter/…/animation/tween.dart:327
#8      Animatable.evaluate
package:flutter/…/animation/tween.dart:53
#9      _AnimatedThemeState.build
package:flutter/…/material/theme.dart:232
#10     StatefulElement.build
package:flutter/…/widgets/framework.dart:4919
#11     ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:4806
#12     StatefulElement.performRebuild
package:flutter/…/widgets/framework.dart:4977
#13     Element.rebuild
package:flutter/…/widgets/framework.dart:4529
#14     BuildOwner.buildScope
package:flutter/…/widgets/framework.dart:2659
#15     WidgetsBinding.drawFrame
package:flutter/…/widgets/binding.dart:891
#16     RendererBinding._handlePersistentFrameCallback
package:flutter/…/rendering/binding.dart:370
#17     SchedulerBinding._invokeFrameCallback
package:flutter/…/scheduler/binding.dart:1146
#18     SchedulerBinding.handleDrawFrame
package:flutter/…/scheduler/binding.dart:1083
#19     SchedulerBinding._handleDrawFrame
package:flutter/…/scheduler/binding.dart:997
#23     _invoke (dart:ui/hooks.dart:151:10)
#24     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
#25     _drawFrame (dart:ui/hooks.dart:115:31)
(elided 5 frames from class _AssertionError and dart:async)
════════════════════════════════════════════════════════════════════════════════

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[danagbemava-nc]

Closing this as a duplicate of #103864.

Kindly follow up in the linked issue for updates.

Please upvote the linked issue as well.

Thank you

[github-actions]

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