Footer widget doesn't work as intended

[zigapovhe]

Describe the bug
Footer is only visible at the end of GroupedListView, and as such, doesn't really give any added value to the package. It should add footer widget to the end of each section.

Expected behavior
Based on this issue #28, the expected behavior would be, to see footer widget at the end of each section (group)

Information:

• Dart version: 3.1.3
• Flutter version: 3.13.6
• Platform: macOS 14.0
• Package version: 5.1.3 (46c861d)

I've used the code from your example.dart file

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

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

List _elements = [
  {'name': 'John', 'group': 'Team A'},
  {'name': 'Will', 'group': 'Team B'},
  {'name': 'Beth', 'group': 'Team A'},
  {'name': 'Miranda', 'group': 'Team B'},
  {'name': 'Mike', 'group': 'Team C'},
  {'name': 'Danny', 'group': 'Team C'},
];

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Grouped List View Example'),
        ),
        body: _createGroupedListView(),
      ),
    );
  }

  _createGroupedListView() {
    return GroupedListView<dynamic, String>(
      elements: _elements,
      footer: Container(color: Colors.red, child: const Text('This is footer widget')),
      groupBy: (element) => element['group'],
      groupComparator: (value1, value2) => value2.compareTo(value1),
      itemComparator: (item1, item2) => item1['name'].compareTo(item2['name']),
      order: GroupedListOrder.DESC,
      useStickyGroupSeparators: true,
      groupSeparatorBuilder: (String value) => Padding(
        padding: const EdgeInsets.all(8.0),
        child: Text(
          value,
          textAlign: TextAlign.center,
          style: const TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
        ),
      ),
      itemBuilder: (c, element) {
        return Card(
          elevation: 8.0,
          margin: const EdgeInsets.symmetric(horizontal: 10.0, vertical: 6.0),
          child: SizedBox(
            child: ListTile(
              contentPadding: const EdgeInsets.symmetric(horizontal: 20.0, vertical: 10.0),
              leading: const Icon(Icons.account_circle),
              title: Text(element['name']),
              trailing: const Icon(Icons.arrow_forward),
            ),
          ),
        );
      },
    );
  }
}

[zigapovhe]

Can be closed, as I've fixed it in my own fork. @Dimibe If you want, I can make a PR for it, but for me, it does the job: zigapovhe@96e800f

[Dimibe]

@zigapovhe:
I would appreciate it if you could open a PR. I will then decide if I want to add the feature to the package or not.
Thanks in advance!