Repository: flutter
Issue: AlertDialog with showDialog behavior is wrong at flex mode of zflip 3 & 4.
Labels: e: device-specific,platform-android,framework,f: material design,has reproducible steps,P2,found in release: 3.3,found in release: 3.6,team-framework,triaged-framework

It seems showDialog or AlertDialog (I'm not sure what is the real problem.) acts wrongly at flex mode (folded) of Samsung ZFlip4 & 3.
There are no spec about flex mode, but when folding the phone, only the position of the dialog was change to the center of upper part of the screen.

I think, it's wrong behavior because showDialog or AlertDialog has no spec on that, and the rest of view remains same.
I think, there should not be partial changes (like only dialog position changing) until supporting flex mode explicitly, so I think it seems a buggy situation.

How can we solve this? At least, can I disable flex mode for the view from flutter side?

## Steps to Reproduce

1. Using zflip4 or 3, launch the example code (it's almost the same as the sample code using `flutter create` except calling showDialog)
2. Click plus button to lauch alert dialog using `showDialog`
3. Make zflip4 to flex mode by folding the phone.

**Expected results:** | **Actual results:** <!-- what did you see? -->
| -- | -- |
| There are no changes in the view.  - This is normal situation | The position of the dialog is changed to the center of the upper part of the screen. (Only the dialog, not the entire application). - And this is flex mode (folding the phone) situation |
| <img src="https://user-images.githubusercontent.com/6769075/201577794-a57e575d-eb0a-472d-b983-8c4f70d3e422.jpg" /> | <img src="https://user-images.githubusercontent.com/6769075/201577799-f256cf9a-5f90-4005-9ea2-67f70164e5ab.jpg" /> |

<details>
<summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          showDialog(
              context: context,
              builder: ((context) {
                debugPrint("TEST!!!!");

                return AlertDialog(
                  content: Card(
                    child: Text("Test card alert dialog"),
                  ),
                );
              }));
        },
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

```