Repository: flutter
Issue: Method `getOffsetForCaret` return incorrect offset.
Labels: a: text input,has reproducible steps,P2,team-text-input,triaged-text-input,found in release: 3.24,found in release: 3.27

### Steps to reproduce

1. Copy paste the provided code.
2. Type `i` n number times till we don't reach the next line.
3. Then type `i` 4 more time in the next line.

### Expected results

Method `getOffsetForCaret` should return correct offset.

When we go to the next line, the `getOffsetForCaret` should return `dy` offest to be `23` and  `dx` should be `4.86...`. 


### Actual results

We type the 'i' character n number of times until we reach the end of the line. While continuing to type 'i' characters, if a line break occurs (which is rendered correctly on the screen), the Offset remains invalid.

A valid line break is only considered when we type 4 more 'i' characters on the next line.

However, if we type a different character, such as '@', as the last character and a line break occurs, the offset is correctly returned.

### Code sample

<details open><summary>Code sample</summary>

```dart
import 'dart:ui';

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Get cursor (caret) position',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
          useMaterial3: true,
          colorScheme: ColorScheme.highContrastLight(),
          inputDecorationTheme: InputDecorationTheme(
              border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(8.0),
          ))),
      home: MyHomePage(title: 'Get cursor (caret) position'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({
    required this.title,
    super.key,
  });

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final TextStyle _textFieldStyle = TextStyle(fontSize: 20);
  final TextEditingController _textFieldController = TextEditingController();
  late final TextField _textField;
  double xCaret = 0.0;
  double yCaret = 0.0;
  double painterWidth = 0.0;
  double painterHeight = 0.0;
  double preferredLineHeight = 0.0;
  Size physicalSize = Size.zero;
  Size devicePixelRatio = Size.zero;

  @override
  void initState() {
    super.initState();

    /// Listen changes on your text field controller
    _textFieldController.addListener(() {
      _updateCaretOffset(_textFieldController.text);
    });
    _textField = TextField(
      controller: _textFieldController,
      keyboardType: TextInputType.multiline,
      style: _textFieldStyle,
      maxLines: 5,
    );
  }

  void _updateCaretOffset(String text) {
    // First get the FlutterView.
    FlutterView view = WidgetsBinding.instance.platformDispatcher.views.first;

    // Dimensions in physical pixels (px)
    physicalSize = view.physicalSize;
    // Dimensions in logical pixels (dp)
    devicePixelRatio = view.physicalSize / view.devicePixelRatio;
    TextPainter painter = TextPainter(
      textDirection: TextDirection.ltr,
      text: TextSpan(style: _textFieldStyle, text: text),
      maxLines: _textField.maxLines,
    );
    painter.layout(
      // 32 is (symmetric horizontal padding) around the whole body
      // 32 is (symmetric horizontal padding) inside input decoration
      maxWidth: devicePixelRatio.width - (32 + 32 + _textField.cursorWidth),
    );

    TextPosition cursorTextPosition = _textFieldController.selection.base;
    Rect caretPrototype = Rect.fromLTWH(
      0.0,
      0.0,
      _textField.cursorWidth,
      _textField.cursorHeight ?? painter.preferredLineHeight,
    );
    Offset caretOffset =
        painter.getOffsetForCaret(cursorTextPosition, caretPrototype);
    setState(() {
      xCaret = caretOffset.dx;
      yCaret = caretOffset.dy;
      painterWidth = painter.width;
      painterHeight = painter.height;
      preferredLineHeight = painter.preferredLineHeight;
    });
  }

  @override
  Widget build(BuildContext context) {
    final dataMap = {
      "xCaret": xCaret.toString(),
      "yCaret": yCaret.toString(),
      "yCaretBottom": (yCaret + preferredLineHeight).toString(),
      "Painter Width": painterWidth.toString(),
      "Painter Height": painterHeight.toString(),
      "Preferred Line Height": preferredLineHeight.toString(),
      "Physical Size": "${physicalSize.width} x ${physicalSize.height}",
      "Device Pixel Ratio":
          "${devicePixelRatio.width} x ${devicePixelRatio.height}",
    };

    return Scaffold(
      appBar: AppBar(title: Text(widget.title)),
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 16),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              Text(dataMap.entries
                  .map((e) => '${e.key}: ${e.value}')
                  .join('\n')),
              _textField,
            ],
          ),
        ),
      ),
    );
  }
}
```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>


https://github.com/user-attachments/assets/037f2824-55dd-41e7-9b81-0bc135dbe314



</details>



### Logs

<details open><summary>Logs</summary>

```console
[!] Flutter (Channel beta, 3.27.0-0.1.pre, on Microsoft Windows [Version 10.0.22631.4460], locale en-IN)
    • Flutter version 3.27.0-0.1.pre on channel beta at C:\Users\harsh\fvm\default
    ! Warning: `flutter` on your path resolves to C:\Users\harsh\fvm\versions\beta\bin\flutter, which is not inside your current Flutter SDK checkout at
      C:\Users\harsh\fvm\default. Consider adding C:\Users\harsh\fvm\default\bin to the front of your path.
    ! Warning: `dart` on your path resolves to C:\Users\harsh\fvm\versions\beta\bin\dart, which is not inside your current Flutter SDK checkout at
      C:\Users\harsh\fvm\default. Consider adding C:\Users\harsh\fvm\default\bin to the front of your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 2e2c358c9b (5 weeks ago), 2024-10-22 11:02:13 -0400
    • Engine revision af0f0d559c
    • Dart version 3.6.0 (build 3.6.0-334.3.beta)
    • DevTools version 2.40.1
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and
      upgrades.

[✓] Windows Version (Installed version of Windows is version 10 or higher)

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0-rc2)
    • Android SDK at C:\Users\harsh\AppData\Local\Android\sdk
    • Platform android-35, build-tools 35.0.0-rc2
    • Java binary at: C:\Program Files\Android\Android Studio2\jbr\bin\java
    • Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at C:\Users\harsh\AppData\Local\Google\Chrome\Application\chrome.exe

[!] Android Studio (version 2023.1)
    • Android Studio at C:\Program Files\Android\Android Studio1
    • 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
    ✗ Unable to determine bundled Java version.
    • Try updating or re-installing Android Studio.

[✓] Android Studio (version 2024.1)
    • Android Studio at C:\Program Files\Android\Android Studio2
    • 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 17.0.11+0--11852314)

[✓] IntelliJ IDEA Community Edition (version 2023.2)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2023.2.1
    • 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 1.95.3)
    • VS Code at C:\Users\harsh\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.101.20241031

[✓] Connected device (3 available)
    • SM G990B2 (mobile) • RZCX1046DPX • android-arm64  • Android 14 (API 34)
    • Chrome (web)       • chrome      • web-javascript • Google Chrome 131.0.6778.86
    • Edge (web)         • edge        • web-javascript • Microsoft Edge 129.0.2792.89

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 2 categories.
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[Paste your output here]
```

</details>