Repository: flutter
Issue: Draggable widget loses text styling while dragging
Labels: framework,f: material design,a: quality,has reproducible steps,found in release: 2.2,team-design,triaged-design

When dragging `Draggable` widget, `feedback` widget containing `Text` loses default material styling.

## Steps to Reproduce

```dart
class MainPage extends StatelessWidget {
  const MainPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: <Widget>[
            Draggable<int>(
              // Data is the value this Draggable stores.
              data: 10,
              child: _component(),
              feedback: _component(),
              childWhenDragging: _component(),
            ),
            DragTarget<int>(
              builder: (
                BuildContext context,
                List<dynamic> accepted,
                List<dynamic> rejected,
              ) {
                return Container(
                  height: 100.0,
                  width: 100.0,
                  color: Colors.cyan,
                  child: const Center(
                    child: Text('Value is updated to'),
                  ),
                );
              },
              onAccept: (int data) {},
            ),
          ],
        ),
      ),
    );
  }

  Widget _component() {
    return Container(
      height: 100,
      width: 200,
      color: Colors.lightGreenAccent,
      child: const Center(
        child: Text('Draggable'),
      ),
    );
  }
}
```


**Expected results:**
`feedback:` widget containing `Text` should keep default material/cupertino styling.


**Actual results:** 
![Simulator Screen Shot - iPhone SE (2nd generation) - 2021-06-28 at 15 34 55](https://user-images.githubusercontent.com/37693315/123645277-7f3d1b00-d826-11eb-8579-418cabad549d.png)


<details>
  <summary>Logs</summary>

```
```

[✓] Flutter (Channel master, 2.3.0-17.0.pre.411, on macOS 11.4 20F71 darwin-x64, locale en-GB)
    • Flutter version 2.3.0-17.0.pre.411 at /flutter/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 25ba467b5a (10 days ago), 2021-06-18 21:24:02 -0400
    • Engine revision ced58ef9c1
    • Dart version 2.14.0 (build 2.14.0-217.0.dev)

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5.1, Build version 12E507
    • CocoaPods version 1.10.1

[✓] Android Studio (version 4.2)
    • Android Studio at -
    • 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 11.0.8+10-b944.6916264)

[✓] IntelliJ IDEA Ultimate Edition (version 2021.1.2)
    • IntelliJ at -
    • 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

[✓] VS Code (version 1.56.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.22.0

[✓] Connected device (2 available)
    • iPhone SE (2nd generation) (mobile) • 87D0EE23-BF4A-4533-8F4C-882468BF688C • ios        • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)                     • macos                                • darwin-x64 • macOS 11.4 20F71 darwin-x64

! Doctor found issues in 4 categories.

```
```

</details>