Layout Explorer not displaying accurate height of Widget in visualizer

## Steps to Reproduce

1. Replace the contents of main.dart with the following code:
```
import 'package:flutter/material.dart';

void main() {
runApp(MyApp());
}

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: Scaffold(
appBar: AppBar(
title: Text('Demo'),
),
body: Column(children: [
Row(
children: [
Text('hello'),
VerticalDivider(
thickness: 5.0,
),
Text('Word'),
],
),
]),
),
);
}
}

```
2. Run the program using debug mode.
3. Open DevTools
4. Select Row widget in the Flutter Inspector.
5. Open Layout Explorer.
6. Change Cross Axis to Stretch mode.

**Expected results:**
Nothing shows on Layout Explorer screen since adding CrossAxisAlginment.Stretch to the Row widget will create an error.
**Actual results:**
VerticalDivider increases in height in the Layout Explorer visualizer, but the actual height remains 0.

Logs

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