Multiline textfield not work properly in flutter iframe

### Steps to reproduce

1. Create a flutter app, put textfield inside
2. Build web and put your app to the server, so you can add it to iframe by the link
3. Create iframe with flutter in react
I can reproduce this issue in Safari on iOS 18.6.2

### Expected results

Expected result: When user press on textfield screen will scroll up and textfield appears up to keyboard


### Actual results

Actual result: Keyboard overlap screen elements until something typed in

### Code sample

<details open><summary>Code sample</summary>

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

void main() {
  runApp(const MainApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: [TextField(keyboardType: TextInputType.multiline)],
        ),
      ),
    );
  }
}
```

```typescript
// app/page.tsx
export default function Home() {
    return (
        <main style={{ minHeight: "100vh", display: "grid", placeItems: "center", padding: "2rem" }}>
            <iframe
                src="http://192.168.3.84:8081"
                title="Flutter App"
                style={{ width: "100%", maxWidth: 1024, height: 700, border: "1px solid #e5e5e5", borderRadius: 12 }}
                allow="fullscreen; clipboard-read; clipboard-write"
                loading="lazy"
            />
        </main>
    );
}
```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

https://github.com/user-attachments/assets/d4970387-7626-4dd1-91ee-5993bbafb063 - actual result

https://github.com/user-attachments/assets/446e833a-de4c-4433-9141-f65af095ada0 - expected result


</details>


### Logs

<details open><summary>Logs</summary>

```console
[Paste your logs here]
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[✓] Flutter (Channel stable, 3.38.1, on macOS 15.4 24E248 darwin-arm64, locale ru-RU) [572ms]
    • Flutter version 3.38.1 on channel stable at /Users/nzorin/development/fvm_cache/versions/3.38.1
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision b45fa18946 (6 days ago), 2025-11-12 22:09:06 -0600
    • Engine revision b5990e5ccc
    • Dart version 3.10.0
    • DevTools version 2.51.1
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android,
      enable-ios, cli-animations, enable-native-assets, omit-legacy-version-file, enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0-rc4) [2,7s]
    • Android SDK at /Users/nzorin/Library/Android/sdk
    • Emulator version 36.1.9.0 (build_id 13823996) (CL:N/A)
    • Platform android-36, build-tools 35.0.0-rc4
    • ANDROID_HOME = /Users/nzorin/Library/Android/sdk
    • Java binary at: /opt/homebrew/opt/openjdk@17/bin/java
      This JDK is specified in your Flutter configuration.
      To change the current JDK, run: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment Homebrew (build 17.0.17+0)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.3) [2,7s]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16E140
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [12ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Connected device (3 available) [6,6s]
    • iPhone SE (3rd generation) (mobile) • 367261B1-E417-47CD-A612-D915176DAB56 • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-17-5 (simulator)
    • macOS (desktop)                     • macos                                • darwin-arm64   • macOS 15.4 24E248
      darwin-arm64
    • Chrome (web)                        • chrome                               • web-javascript • Google Chrome
      142.0.7444.162

[✓] Network resources [871ms]
    • All expected network resources are available.

• No issues found!
```

</details>


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Multiline textfield not work properly in flutter iframe #178743

Steps to reproduce

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Uh oh!

Multiline textfield not work properly in flutter iframe #178743

Description

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

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