import 'package:flutter/material.dart';

void main() {
  runApp(const MaterialApp(home: Scaffold(body: BugReport())));
}

class BugReport extends StatefulWidget {
  const BugReport({super.key});

  @override
  State<BugReport> createState() => _BugReportState();
}

class _BugReportState extends State<BugReport> {
  static const int _length = 50;

  List<PopupMenuEntry<int>> _buildItems(BuildContext context) {
    return List<PopupMenuEntry<int>>.generate(_length, (int index) {
      return PopupMenuItem<int>(value: index, child: Text('$index'));
    });
  }

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(50),
      child: Align(
        alignment: Alignment.bottomCenter,
        child: PopupMenuButton(
          itemBuilder: _buildItems,
          initialValue: _length - 1,
          child: const Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text('Click here to open popup menu '),
              Icon(Icons.ads_click),
            ],
          ),
        ),
      ),
    );
  }
}

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

void main() {
  testWidgets('PopupMenuButton scrolls initial value to visible', (WidgetTester tester) async {
    const int length = 50;
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: Align(
            alignment: Alignment.bottomCenter,
            child: PopupMenuButton(
              itemBuilder: (BuildContext context) {
                return List<PopupMenuEntry<int>>.generate(length, (int index) {
                  return PopupMenuItem<int>(value: index, child: Text('item #$index'));
                });
              },
              popUpAnimationStyle: AnimationStyle.noAnimation,
              initialValue: length - 1,
              child: const Text('click here'),
            ),
          ),
        ),
      ),
    );
    await tester.tap(find.text('click here'));
    await tester.pump();

    // Set up finder and verify basic widget structure
    final Finder findSelectedItem = find.text('item #49');
    expect(findSelectedItem, findsOne);

    // The initially selected menu item should be positioned on screen
    final RenderBox selectedItem = tester.renderObject<RenderBox>(findSelectedItem);
    final Rect selectedItemBounds = selectedItem.localToGlobal(Offset.zero) & selectedItem.size;
    final Size windowSize = tester.view.physicalSize / tester.view.devicePixelRatio;
    expect(selectedItemBounds.bottomRight.dy, lessThanOrEqualTo(windowSize.height));
  });
}