Hot reload time out

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:sliver_fbs/src/names.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.orange,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

  MyHomePage({Key key, this.title}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _buildScrollable(context),
    );
  }

  Widget _buildScrollable(BuildContext context) {
    return CustomScrollView(
      slivers: [
        SliverAppBar(
          title: Text('Hello'),
          expandedHeight: 200,
          flexibleSpace: Placeholder(),
          floating: true,
          // ========= TRY UNCOMMENTING THE FOLLOWING LINE AND HOT RELOADING ========
          // pinned: true,
        ),
        SliverSomething(
          child: Container(
            color: Colors.orange,
            child: Text('hello'),
            height: 150,
          ),
        ),
        SliverPadding(
          padding: EdgeInsets.all(16),
          sliver: SliverList(
            delegate: SliverChildBuilderDelegate(
              (context, index) => _buildTile(context, allNames[index]),
              childCount: allNames.length,
            ),
          ),
        )
      ],
    );
  }

  Widget _buildTile(BuildContext context, Name name) {
    final style = Theme.of(context).textTheme.title;

    return Row(
      children: [
        Padding(
          padding: EdgeInsets.all(16),
          child: Container(
            width: 16,
            height: 16,
            color: name.color,
          ),
        ),
        Text(name.camelCase, style: style),
      ],
    );
  }
}

class SliverFilip extends SingleChildRenderObjectWidget {
  SliverFilip({Widget child, Key key}) : super(child: child, key: key);

  @override
  RenderObject createRenderObject(BuildContext context) {
    return RenderSliverFilip();
  }
}

class SliverSomething extends SingleChildRenderObjectWidget {
  SliverSomething({Widget child, Key key}) : super(child: child, key: key);

  @override
  RenderObject createRenderObject(BuildContext context) {
    return RenderSliverFilip();
  }
}

class RenderSliverFilip extends RenderSliverSingleBoxAdapter {
  RenderSliverFilip({
    RenderBox child,
  }) : super(child: child);

  @override
  void performLayout() {
    if (child == null) {
      geometry = SliverGeometry.zero;
      return;
    }
    child.layout(constraints.asBoxConstraints(), parentUsesSize: true);
    double childExtent;
    switch (constraints.axis) {
      case Axis.horizontal:
        childExtent = child.size.width;
        break;
      case Axis.vertical:
        childExtent = child.size.height;
        break;
    }
    assert(childExtent != null);

    final isOdd = constraints.scrollOffset.toInt().isOdd;

    final extent = constraints.scrollOffset * 2;

    geometry = SliverGeometry(
      scrollExtent: isOdd ? 70 : 80,
      paintExtent: 70,
      paintOrigin: extent,
      maxPaintExtent: 70,
    );

    setChildParentData(child, constraints, geometry);
  }
}