Scaffold95 body behavior differs from Flutter's default Scaffold

[vaibhavppandey]

Hello,

I've observed that Scaffold95 doesn't mimic Flutter's default Scaffold behavior. Specifically:

Center in body doesn't actually center widgets.
Using double.infinity dimensions (in SizedBox) causes unbounded constraints errors.

Reproduction:

Scaffold95(
  title: 'Flutter95',
  body: Center(child: Text('Test', style: Flutter95.textStyle)),
)

For those familiar with Flutter's Scaffold Widget, this can be confusing.

Suggested Fix:
Consider updating Scaffold95 widget to automatically manage constraints, perhaps by wrapping the body with Expanded widget.

Proposed change in scaffold95.dart

children: <Widget>[
  WindowHeader95(title: title, onClosePressed: onClosePressed),
  const SizedBox(height: 4),
  if (toolbar != null) toolbar!,
  if (toolbar != null) const SizedBox(height: 4),
  Expanded(child: body),  // Wrap the body with an Expanded widget
],

This tweak might enhance its intuitiveness for Flutter developers.

[miquelbeltran]

Do you think you can provide a PR with the fix?