RenderCustomLayoutBox does not meet its constraints on empty initState

[bubnenkoff]

copy-paste example:

import 'dart:html';
import 'dart:math';

import 'package:flutter/material.dart';
import 'package:graph_page/service/service.dart';
import 'package:graphview/GraphView.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
        home: TreeViewPage(),
      );
}

class TreeViewPage extends StatefulWidget {
  @override
  _TreeViewPageState createState() => _TreeViewPageState();
}

class _TreeViewPageState extends State<TreeViewPage> {
  @override
  Widget build(BuildContext context) {
    var appBar = AppBar();
    return Scaffold(
      body: Row(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        Expanded(
          child: Container(
            color: Colors.blue[100],
            child: Text("sdfsf"),
          ),
        ),
        Expanded(
          flex: 4,
          child: Container(
            color: Colors.green[100],
            child: InteractiveViewer(
                  constrained: false,
                  boundaryMargin: EdgeInsets.all(100),
                  minScale: 0.01,
                  maxScale: 5.6,
                  child: GraphView(
                    graph: graph,
                    algorithm: BuchheimWalkerAlgorithm(
                        builder, TreeEdgeRenderer(builder)),
                    paint: Paint()
                      ..color = Colors.green
                      ..strokeWidth = 1
                      ..style = PaintingStyle.stroke,
                    builder: (Node node) {
                      // I can decide what widget should be shown here based on the id
                      var a = node.key!.value as int;
                      return rectangleWidget(a);
                    },
                  )),
          ),
        ),
      ],

    ));
  }

  Random r = Random();

  Widget rectangleWidget(int a) {
    return InkWell(
      onTap: () {
        print('clicked');
      },
      child: Container(
          padding: EdgeInsets.all(16),
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(4),

            boxShadow: [
              BoxShadow(
                color: Colors.red,
                blurRadius: 15.0, // soften the shadow
                spreadRadius: 5.0, //extend the shadow
              )
            ],

            // boxShadow: [
            //   BoxShadow(color: Colors.blue[100]!, spreadRadius: 1),
            // ],
          ),
          child: Text('Node ${a}')),
    );
  }

  final Graph graph = Graph()..isTree = true;
  BuchheimWalkerConfiguration builder = BuchheimWalkerConfiguration();

  @override
  void initState() {
    // final node1 = Node.Id(1);
    // final node2 = Node.Id(2);
    // graph.addEdge(node1, node2);

    /*
    final node1 = Node.Id(1);
    final node2 = Node.Id(2);
    final node3 = Node.Id(3);
    final node4 = Node.Id(4);
    final node5 = Node.Id(5);
    final node6 = Node.Id(6);
    final node8 = Node.Id(7);
    final node7 = Node.Id(8);
    final node9 = Node.Id(9);
    final node10 = Node(rectangleWidget(10));  //using deprecated mechanism of directly placing the widget here
    final node11 = Node(rectangleWidget(11));
    final node12 = Node(rectangleWidget(12));

    graph.addEdge(node1, node2);
    graph.addEdge(node1, node3, paint: Paint()..color = Colors.red);
    graph.addEdge(node1, node4, paint: Paint()..color = Colors.blue);
    graph.addEdge(node2, node5);
    graph.addEdge(node2, node6);
    graph.addEdge(node6, node7, paint: Paint()..color = Colors.red);
    graph.addEdge(node6, node8, paint: Paint()..color = Colors.red);
    graph.addEdge(node4, node9);
    graph.addEdge(node4, node10, paint: Paint()..color = Colors.black);
    graph.addEdge(node4, node11, paint: Paint()..color = Colors.red);
    graph.addEdge(node11, node12);
  */
    builder
      ..siblingSeparation = (100)
      ..levelSeparation = (150)
      ..subtreeSeparation = (150)
      ..orientation = (BuchheimWalkerConfiguration.ORIENTATION_TOP_BOTTOM);
  }
}

error:

The following assertion was thrown during performLayout():
RenderCustomLayoutBox does not meet its constraints.

Constraints: BoxConstraints(w=947.2, h=937.6)
Size: Size(77.0, 246.0)

If you are not writing your own RenderBox subclass, then this is not your fault. Contact support: https://github.com/flutter/flutter/issues/new?template=2_bug.md

The relevant error-causing widget was
_GraphView
C:\…\lib\GraphView.dart:57