Repository: flutter
Issue: TextField decoration documentation/assertion bug
Labels: a: text input,f: material design,a: error message,has reproducible steps,P3,found in release: 3.13,found in release: 3.14,team-text-input,triaged-text-input

### Is there an existing issue for this?

- [X] I have searched the [existing issues](https://github.com/flutter/flutter/issues)
- [X] I have read the [guide to filing a bug](https://flutter.dev/docs/resources/bug-reports)

### Steps to reproduce

1. Use Material `TextField` inside a custom theme, outside of `MaterialApp` and any other Flutter-provided wrappers
2. Set `TextField.decoration` to `null` as [per documentation](https://api.flutter.dev/flutter/material/TextField-class.html) **only having it non-null** requires you to have a `Material` ancestor:

   > If [decoration](https://api.flutter.dev/flutter/material/TextField/decoration.html) is non-null (which is the default), the text field requires one of its ancestors to be a [Material](https://api.flutter.dev/flutter/material/Material-class.html) widget.

    Which is understood as having `decoration` value to be `null` allows you not to have `Material` ancestors

### Expected results

Everything works and no errors are happening

### Actual results

The error:

```
No Material widget found.

TextField widgets require a Material widget ancestor within the closest LookupBoundary.
```

So either documentation has to be changed or the assertion has to take into account the decoration value

### Code sample

<details><summary>Code sample</summary>

```dart
import 'package:flutter/cupertino.dart' show DefaultCupertinoLocalizations;
import 'package:flutter/material.dart' show DefaultMaterialLocalizations, TextField;
import 'package:flutter/widgets.dart';

void main() {
  runApp(TextFieldExample());
}

class TextFieldExample extends StatelessWidget {
  @override
  Widget build(final BuildContext context) {
    return Localizations(
      locale: basicLocaleListResolution(null, [Locale('en', 'US')]),
      delegates: [
        DefaultMaterialLocalizations.delegate,
        DefaultCupertinoLocalizations.delegate,
        DefaultWidgetsLocalizations.delegate,
      ],
      child: TextField(decoration: null),
    );
  }
}

```

</details>


### Screenshots or Video

_No response_

### Logs

_No response_

### Flutter Doctor output

```
[✓] Flutter (Channel stable, 3.10.5, on macOS 12.6.3 21G419 darwin-x64, locale en-RU)
    • Flutter version 3.10.5 on channel stable at /usr/local/Caskroom/flutter/3.10.5/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 796c8ef792 (3 months ago), 2023-06-13 15:51:02 -0700
    • Engine revision 45f6e00911
    • Dart version 3.0.5
    • DevTools version 2.23.1

[!] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/outring/Library/Android/sdk
    ✗ 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 14.2)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 14C18
    • CocoaPods version 1.12.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3)
    • 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
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

[✓] Connected device (3 available)
    • iPhone 14 (mobile) • BB48C113-D88F-42CF-992A-A9ABDE3F5069 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-16-2 (simulator)
    • macOS (desktop)    • macos                                • darwin-x64     • macOS 12.6.3 21G419 darwin-x64
    • Chrome (web)       • chrome                               • web-javascript • Google Chrome 116.0.5845.110

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.
```