Repository: flutter
Issue: Material's ThemeData.scrollbarTheme is not applied when using CupertinoScrollBehavior for scrollable view
Labels: framework,f: material design,f: scrolling,f: cupertino,has reproducible steps,P3,team-design,triaged-design,found in release: 3.24,found in release: 3.26

### Steps to reproduce

My application is using MaterialApp. I want to have a customization scrollbar so I declared scrollbarTheme in ThemeData. Below are the minimal steps:

1. Wrap ListView or SingleChildScrollView by ScrollConfiguration with `CupertinoScrollBehavior` behavior
2. Apply `scrollbarTheme` in Material's ThemeData and see all custom theme data does not impact Scrollbar

The issue will not happen when ScrollConfiguration.behavior is `MaterialScrollBehavior()` or without declaring ScrollConfiguration.behavior. 

Certain things I'm wondering about:

- Is it considered unsuitable to utilize CupertinoScrollBehavior in Material Theme? 
- Should I suggest adding scrollbarTheme to CupertinoThemeData, then use CupertinoTheme instead of Material Theme?

### Expected results

For this specific issue, I would expect we can use `CupertinoScrollBehavior` with `scrollbarTheme`.

If this is intentional behavior, perhaps should we add documentation for ScrollConfiguration.behavior so that users may be aware of it?

### Actual results

Scrollbar is showing its default theme, `scrollbarTheme` is ignored.

### Code sample

<details open><summary>Code sample</summary>

```dart
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(
    const MaterialApp(
      home: Home(),
    ),
  );
}

class Home extends StatelessWidget {
  const Home({
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Theme(
        data: ThemeData(
          scrollbarTheme: ScrollbarThemeData(
            thumbColor: WidgetStateProperty.all(Colors.red),
            thickness: WidgetStateProperty.all(2.0),
            trackVisibility: WidgetStateProperty.all(true),
            thumbVisibility: WidgetStateProperty.all(true),
          ),
        ),
        child: ScrollConfiguration(
          behavior: const CupertinoScrollBehavior(),
          child: ListView(
            children: List.generate(
              100,
              (index) => SizedBox(
                height: 100,
                child: Center(
                  child: Text(
                    index.toString(),
                    style: const TextStyle(
                      color: Colors.black,
                      fontSize: 20,
                    ),
                  ),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}
```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

| actual result (with CupertinoScrollBehavior) | expected result (without CupertinoScrollBehavior) |
| --------------- | --------------- |
<video src="https://github.com/user-attachments/assets/a78d61a7-b9ee-4e16-859a-17df64f2cf55"/> | <video src="https://github.com/user-attachments/assets/c03a3c0c-70b2-4c60-836c-c871f5042528"/>

</details>


### Logs

<details open><summary>Logs</summary>

```console
[Paste your logs here]
```

</details>


### Flutter Doctor output

<details><summary>Doctor output</summary>

```console
[✓] Flutter (Channel stable, 3.24.3, on macOS 15.0 24A335 darwin-x64, locale en-VN)
    • Flutter version 3.24.3 on channel stable at /Users/huynq/Documents/GitHub/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 2663184aa7 (3 weeks ago), 2024-09-11 16:27:48 -0500
    • Engine revision 36335019a8
    • Dart version 3.5.3
    • DevTools version 2.37.3

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
    • Android SDK at /Users/huynq/Library/Android/sdk
    • Platform android-35, build-tools 35.0.0
    • ANDROID_HOME = /Users/huynq/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16A242d
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir = /Applications/Android Studio.app/
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)

[✓] Android Studio (version 2024.2)
    • Android Studio at /Applications/Android Studio Ladybug.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 21.0.3+-79915915-b509.11)

[✓] IntelliJ IDEA Community Edition (version 2024.2.3)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 81.1.3
    • Dart plugin version 242.22855.32

[✓] VS Code (version 1.93.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.98.0

[✓] Connected device (2 available)
    • macOS (desktop) • macos  • darwin-x64     • macOS 15.0 24A335 darwin-x64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 129.0.6668.89

[✓] Network resources
    • All expected network resources are available.

• No issues found!
```

```console
[!] Flutter (Channel master, 3.26.0-1.0.pre.353, on macOS 15.0 24A335 darwin-x64, locale en-VN)
    • Flutter version 3.26.0-1.0.pre.353 on channel master at /Users/huynq/Documents/GitHub/flutter_master
    ! Warning: `flutter` on your path resolves to /Users/huynq/Documents/GitHub/flutter/bin/flutter, which is not inside your current Flutter SDK checkout at /Users/huynq/Documents/GitHub/flutter_master. Consider adding /Users/huynq/Documents/GitHub/flutter_master/bin to the front of your path.
    ! Warning: `dart` on your path resolves to /Users/huynq/Documents/GitHub/flutter/bin/dart, which is not inside your current Flutter SDK checkout at /Users/huynq/Documents/GitHub/flutter_master. Consider adding /Users/huynq/Documents/GitHub/flutter_master/bin to the front of your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 389846308a (3 hours ago), 2024-10-03 21:52:22 -0400
    • Engine revision 66d397dff8
    • Dart version 3.6.0 (build 3.6.0-317.0.dev)
    • DevTools version 2.40.0-dev.2
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
    • Android SDK at /Users/huynq/Library/Android/sdk
    • Platform android-35, build-tools 35.0.0
    • ANDROID_HOME = /Users/huynq/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16A242d
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir = /Applications/Android Studio.app
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)

[✓] Android Studio (version 2024.2)
    • Android Studio at /Applications/Android Studio Ladybug.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 21.0.3+-79915915-b509.11)

[✓] IntelliJ IDEA Community Edition (version 2024.2.3)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 81.1.3
    • Dart plugin version 242.22855.32

[✓] VS Code (version 1.93.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.98.0

[✓] Connected device (2 available)
    • macOS (desktop) • macos  • darwin-x64     • macOS 15.0 24A335 darwin-x64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 129.0.6668.90

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.
```

</details>