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Correct editable text and placeholder position in baseline aligned stack (#177342 )

This PR makes CupertinoTextField's placeholder and editable text
position respect `CupertinoTextField.textAlignVertical`.

<details open>
<summary>Image comparison</summary>

| | Before | After | 
| --- | --- | --- |
| top | <img width="436" height="327" alt="top b4"
src="https://github.com/user-attachments/assets/39606c72-fb1f-4619-bfb2-ccaeaf502324"
/> | <img width="436" height="327" alt="top"
src="https://github.com/user-attachments/assets/faea26fc-c934-4660-bbee-e62effa44599"
/> |
| center | <img width="436" height="327" alt="top b4"
src="https://github.com/user-attachments/assets/39606c72-fb1f-4619-bfb2-ccaeaf502324"
/> | <img width="436" height="327" alt="center"
src="https://github.com/user-attachments/assets/2ee7004a-6f70-4af2-b33b-76293c8deac1"
/> |
| bottom | <img width="436" height="327" alt="top b4"
src="https://github.com/user-attachments/assets/39606c72-fb1f-4619-bfb2-ccaeaf502324"
/> | <img width="436" height="327" alt="bottom"
src="https://github.com/user-attachments/assets/69ba89fb-9f1c-456e-9889-216eb31d66b9"
/> |

</details>

<details>
<summary>Sample code</summary>

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

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(home: HomePage());
  }
}

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

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  TextEditingController commentController = TextEditingController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.grey,
      body: SafeArea(
        child: Center(
          child: Padding(
            padding: const EdgeInsets.all(8.0),
            child: CupertinoTextField(
              style: const TextStyle(fontSize: 40),
              placeholderStyle: const TextStyle(
                fontSize: 80,
                color: CupertinoColors.inactiveGray,
              ),
              placeholder: 'Enter text',
              textAlignVertical: TextAlignVertical.bottom,
            ),
          ),
        ),
      ),
    );
  }
}

```

</details>

Fixes [CupertinoTextField text not vertically centered when fontSize
differs between style and
placeholderStyle.](https://github.com/flutter/flutter/issues/176817)

2025-10-27 22:53:57 +00:00

material

…

action_sheet_test.dart

Bump Dart to 3.8 and reformat (#171703 )

2025-07-07 17:58:32 +00:00

activity_indicator_test.dart

Add CupertinoLinearActivityIndicator (#170108 )

2025-09-19 17:16:21 +00:00

adaptive_text_selection_toolbar_test.dart

Fix empty adaptive text selection toolbars building. (#174656 )

2025-08-29 05:17:06 +00:00