Repository: flutter
Issue: [IOS] Inconsistent Behavior of Password Save Prompt in Flutter Autofill using `TextInput.finishAutofillContext(shouldSave: true)`
Labels: a: text input,platform-ios,framework,has reproducible steps,P2,team-ios,triaged-ios,fyi-text-input,found in release: 3.27,found in release: 3.28

## Description
The issue consists of two distinct aspects:
1. The problem related to `onDisposeAction: AutofillContextAction.cancel` appears to be resolved by the PR [#160653](https://github.com/flutter/flutter/pull/160653).

2. However, another issue remains unresolved: When `TextInput.finishAutofillContext(shouldSave: true)` is called for the first time, the password save prompt appears as expected. But subsequent calls to `TextInput.finishAutofillContext(shouldSave: true)` do not trigger the popup again unless the text fields are cleared, re-filled with new input, and then the method is called again.

### Expected Behavior
- The password save prompt should appear **every time** `TextInput.finishAutofillContext(shouldSave: true)` is invoked, regardless of prior invocations or text field states.

### Actual Behavior
- The password save prompt appears only the first time `TextInput.finishAutofillContext(shouldSave: true)` is invoked.
- Further invocations do not display the popup unless the text fields are cleared and re-filled.

## Steps to Reproduce
1. Implement an `AutofillGroup` with the following setup:
    ```dart
    AutofillGroup(
      onDisposeAction: AutofillContextAction.cancel,
      child: Column(
        children: [
          TextField(
            autofillHints: [AutofillHints.username],
          ),
          TextField(
            autofillHints: [AutofillHints.password],
            obscureText: true,
          ),
        ],
      ),
    );
    ```
2. Call `TextInput.finishAutofillContext(shouldSave: true);`. Observe that the password save prompt appears.
3. Call `TextInput.finishAutofillContext(shouldSave: true);` again without clearing or re-filling the text fields. Observe that the password save prompt does not appear.
4. Clear the text fields, enter new credentials, and call `TextInput.finishAutofillContext(shouldSave: true);` again. Observe that the password save prompt appears.

## Code Example
Here’s a simplified code snippet to reproduce the issue:

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: AutofillExample(),
    );
  }
}

class AutofillExample extends StatelessWidget {
  final TextEditingController usernameController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Autofill Example')),
      body: AutofillGroup(
        onDisposeAction: AutofillContextAction.cancel,
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            children: [
              TextField(
                controller: usernameController,
                autofillHints: [AutofillHints.username],
                decoration: InputDecoration(labelText: 'Username'),
              ),
              TextField(
                controller: passwordController,
                autofillHints: [AutofillHints.password],
                obscureText: true,
                decoration: InputDecoration(labelText: 'Password'),
              ),
              ElevatedButton(
                onPressed: () {
                  TextInput.finishAutofillContext(shouldSave: true);
                },
                child: Text('Submit'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}
```

## Environment
- Flutter version: [3.24.5]
- Platform: [iOS]

## Additional Notes
The PR [#160653](https://github.com/flutter/flutter/pull/160653) addresses the issue with `onDisposeAction: AutofillContextAction.cancel`, but the behavior of `TextInput.finishAutofillContext(shouldSave: true)` as described above remains unresolved. This issue requires attention to ensure consistent behavior of the password save prompt.