Scrollbar margins are handled inconsistently #106918

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      scrollBehavior: MaterialScrollBehavior().copyWith(scrollbars: false),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: RawScrollbar(
        mainAxisMargin: 5,
        crossAxisMargin: 5,
        trackVisibility: true,
        thumbVisibility: true,
        thickness: 20,
        thumbColor: Colors.red,
        trackColor: Colors.blue,
        trackBorderColor: Colors.orange,
        child: Column(
          children: [
            Center(
              child: SizedBox(
                height: 500,
                child: CustomScrollView(
                  primary: true,
                  slivers: [
                    SliverList(
                      delegate: SliverChildBuilderDelegate(
                      (c, i) => Container(height: 50, child: Center(child: Text('Item $i'))),
                      childCount: 50,
                    ),
                    )
                  ]
                ),
              ),
            ),
            Container(height: 20, color: Colors.green)
          ],
        ),
      ), 
    );
  }
}