a11y android semanticsValue causes screen to freeze





### Steps to reproduce

1. flutter create --sample=material.CircularProgressIndicator.1
2. madd semanticsValue: "someval" to the CircularProgressIndicator

### Expected results

The progress bar should be correctly visible to talkback. So should the other controls on the screen.

### Actual results

Talkback can't see any control on progress bar screen

### Code sample

<details open><summary>Code sample</summary>

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

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      // Setting this to true will help you instantly see the semantics crash!
      showSemanticsDebugger: true, 
      home: ProgressIndicatorExample(),
    );
  }
}

class ProgressIndicatorExample extends StatefulWidget {
  const ProgressIndicatorExample({super.key});

  @override
  State<ProgressIndicatorExample> createState() => _ProgressIndicatorExampleState();
}

class _ProgressIndicatorExampleState extends State<ProgressIndicatorExample> with SingleTickerProviderStateMixin {
  bool year2023 = false;
  late AnimationController controller;

  @override
  void initState() {
    super.initState();
    // Creates a dummy progress value that loops from 0.0 to 1.0
    controller = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 2),
    )..addListener(() {
        setState(() {});
      })..repeat();
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Semantics Crash Repro')),
      body: Center(
        child: Column(
          spacing: 16.0,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('Determinate CircularProgressIndicator'),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 16),
              child: CircularProgressIndicator(
                // ignore: deprecated_member_use
                year2023: year2023,
                // BUG TRIGGER: The "%" symbol here causes the crash when Semantics tries to parse it
                semanticsValue: "${controller.value}%", 
                value: controller.value,
              ),
            ),
            const Text('Indeterminate CircularProgressIndicator'),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 16),
              // ignore: deprecated_member_use
              child: CircularProgressIndicator(year2023: year2023),
            ),
            SwitchListTile(
              value: year2023,
              title: year2023
                  ? const Text('Switch to latest M3 style')
                  : const Text('Switch to year2023 M3 style'),
              onChanged: (bool value) {
                setState(() {
                  year2023 = !year2023;
                });
              },
            ),
          ],
        ),
      ),
    );
  }
}
```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

[Upload media here]

</details>


### Logs

<details open><summary>Logs</summary>

```console
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY
╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Progress bar value, minValue, and maxValue must be valid numbers. value:
"0.2517312%", minValue:
"0", maxValue: "100"

When the exception was thrown, this was the stack:
#0      SemanticsNode._addToUpdate.<anonymous closure>
(package:flutter/src/semantics/semantics.dart:4014:9)
#1      SemanticsNode._addToUpdate
(package:flutter/src/semantics/semantics.dart:4017:6)
#2      SemanticsOwner.sendSemanticsUpdate
(package:flutter/src/semantics/semantics.dart:4987:14)
#3      PipelineOwner.flushSemantics
(package:flutter/src/rendering/object.dart:1516:24)
#4      PipelineOwner.flushSemantics
(package:flutter/src/rendering/object.dart:1518:15)
#5      RendererBinding.drawFrame
(package:flutter/src/rendering/binding.dart:636:25)
#6      WidgetsBinding.drawFrame
(package:flutter/src/widgets/binding.dart:1477:13)
#7      RendererBinding._handlePersistentFrameCallback
(package:flutter/src/rendering/binding.dart:495:5)
#8      SchedulerBinding._invokeFrameCallback
(package:flutter/src/scheduler/binding.dart:1430:15)
#9      SchedulerBinding.handleDrawFrame
(package:flutter/src/scheduler/binding.dart:1345:9)
#10     SchedulerBinding._handleDrawFrame
(package:flutter/src/scheduler/binding.dart:1198:5)
#11     _invoke (dart:ui/hooks.dart:423:13)
#12     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:447:5)
#13     _drawFrame (dart:ui/hooks.dart:395:31)
════════════════════════════════════════════════════════════════════════════════
════════════════════
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output main branch</summary>

```console
[zywek@dell sample5]$ flutter doctor -v
[✓] Flutter (Channel main, 3.42.0-1.0.pre-151, on Arch Linux 6.18.5-arch1-1,
    locale pl_PL.UTF-8) [452ms]
    • Flutter version 3.42.0-1.0.pre-151 on channel main at
      /home/zywek/git/flutter
    • Upstream repository https://github.com/flutter/flutter
    • Framework revision 9fa7f81be0 (2 godziny temu), 2026-02-17 05:03:31 -0500
    • Engine revision 9fa7f81be0
    • Dart version 3.12.0 (build 3.12.0-154.0.dev)
    • DevTools version 2.55.0
    • Feature flags: enable-web, enable-linux-desktop, no-enable-macos-desktop,
      no-enable-windows-desktop, enable-android, no-enable-ios,
      no-cli-animations, enable-native-assets, omit-legacy-version-file,
      enable-lldb-debugging, enable-uiscene-migration, enable-riscv64

[✓] Android toolchain - develop for Android devices (Android SDK version 36.1.0)
    [973ms]
    • Android SDK at /opt/android-sdk
    • Emulator version 36.2.12.0 (build_id 14214601) (CL:N/A)
    • Platform android-36.1, build-tools 36.1.0
    • ANDROID_HOME = /opt/android-sdk
    • ANDROID_SDK_ROOT = /opt/android-sdk
    • Java binary at: /usr/bin/java
      This JDK was found in the system PATH.
      To manually set the JDK path, use: `flutter config
      --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 17.0.17+10)
    • All Android licenses accepted.

[✓] Chrome - develop for the web [5ms]
    • CHROME_EXECUTABLE = /opt/brave-bin/brave

[✓] Linux toolchain - develop for Linux desktop [215ms]
    • clang version 21.1.6
    • cmake version 4.2.1
    • ninja version 1.13.2
    • pkg-config version 2.5.1
    • OpenGL core renderer: Mesa Intel(R) Graphics (ARL) (X11)
    • OpenGL core version: 4.6 (Core Profile) Mesa 25.3.3-arch1.2 (X11)
    • OpenGL core shading language version: 4.60 (X11)
    • OpenGL ES renderer: Mesa Intel(R) Graphics (ARL) (X11)
    • OpenGL ES version: OpenGL ES 3.2 Mesa 25.3.3-arch1.2 (X11)
    • OpenGL ES shading language version: OpenGL ES GLSL ES 3.20 (X11)
    • GL_EXT_framebuffer_blit: yes (X11)
    • GL_EXT_texture_format_BGRA8888: yes (X11)

[✓] Connected device (3 available) [179ms]
    • SM G973F (mobile) • RF8M63XB4HA • android-arm64  • Android 15 (API 35)
    • Linux (desktop)   • linux       • linux-x64      • Arch Linux
      6.18.5-arch1-1
    • Chrome (web)      • chrome      • web-javascript • Brave Browser
      143.1.85.120 unknown

[✓] Network resources [218ms]
    • All expected network resources are available.

• No issues found!
[zywek@dell sample5]$ 

```

</details>

<details open><summary>Doctor output stable branch</summary>

```console
[zywek@dell sample5]$ flutter doctor -v
[✓] Flutter (Channel stable, 3.41.1, on Arch Linux 6.18.5-arch1-1, locale
    pl_PL.UTF-8) [17ms]
    • Flutter version 3.41.1 on channel stable at /home/zywek/git/flutter
    • Upstream repository https://github.com/flutter/flutter
    • Framework revision 582a0e7c55 (4 dni temu), 2026-02-12 17:12:32 -0800
    • Engine revision 3452d735bd
    • Dart version 3.11.0
    • DevTools version 2.54.1
    • Feature flags: enable-web, enable-linux-desktop, no-enable-macos-desktop,
      no-enable-windows-desktop, enable-android, no-enable-ios,
      no-cli-animations, enable-native-assets, omit-legacy-version-file,
      enable-lldb-debugging, enable-uiscene-migration

[✓] Android toolchain - develop for Android devices (Android SDK version 36.1.0)
    [711ms]
    • Android SDK at /opt/android-sdk
    • Emulator version 36.2.12.0 (build_id 14214601) (CL:N/A)
    • Platform android-36.1, build-tools 36.1.0
    • ANDROID_HOME = /opt/android-sdk
    • ANDROID_SDK_ROOT = /opt/android-sdk
    • Java binary at: /usr/bin/java
      This JDK was found in the system PATH.
      To manually set the JDK path, use: `flutter config
      --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 17.0.17+10)
    • All Android licenses accepted.

[✓] Chrome - develop for the web [4ms]
    • CHROME_EXECUTABLE = /opt/brave-bin/brave

[✓] Linux toolchain - develop for Linux desktop [204ms]
    • clang version 21.1.6
    • cmake version 4.2.1
    • ninja version 1.13.2
    • pkg-config version 2.5.1
    • OpenGL core renderer: Mesa Intel(R) Graphics (ARL) (X11)
    • OpenGL core version: 4.6 (Core Profile) Mesa 25.3.3-arch1.2 (X11)
    • OpenGL core shading language version: 4.60 (X11)
    • OpenGL ES renderer: Mesa Intel(R) Graphics (ARL) (X11)
    • OpenGL ES version: OpenGL ES 3.2 Mesa 25.3.3-arch1.2 (X11)
    • OpenGL ES shading language version: OpenGL ES GLSL ES 3.20 (X11)
    • GL_EXT_framebuffer_blit: yes (X11)
    • GL_EXT_texture_format_BGRA8888: yes (X11)

[✓] Connected device (3 available) [182ms]
    • SM G973F (mobile) • RF8M63XB4HA • android-arm64  • Android 15 (API 35)
    • Linux (desktop)   • linux       • linux-x64      • Arch Linux
      6.18.5-arch1-1
    • Chrome (web)      • chrome      • web-javascript • Brave Browser
      143.1.85.120 unknown

[✓] Network resources [222ms]
    • All expected network resources are available.

• No issues found!
[zywek@dell sample5]$ 

```

</details>

I hope someone will take a peek at this sooner than [this](https://github.com/flutter/flutter/issues/149613)  it is quite important to me as this error appeared in the app ready to be updated on google play

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a11y android semanticsValue causes screen to freeze #182491

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a11y android semanticsValue causes screen to freeze #182491

Description

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

Metadata

Metadata

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Labels

Type

Fields

Projects

Milestone

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Development

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