Fixes update to version 3.0 of flutter.

[UP929312]

This change will fix the error when using Flutter 3.0,

: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/lib/grouped_list.dart:264

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
  package:flutter/…/widgets/binding.dart:1
  WidgetsBinding.instance!.addPostFrameCallback((_) {

[ekuleshov]

@Dimibe unfortunately this fix make the last version of this package only compatible with Flutter 3, yet package sdk restrictions are at the level supported with Flutter 2.

It would be really nice if package supported both Flutter 2 and 3

To preserve backward compatibility with Flutter 2 the recommended way is to use this approach https://docs.flutter.dev/development/tools/sdk/release-notes/release-notes-3.0.0#your-code

For example:
jonataslaw/getx@9d2b872

[Dimibe]

Hi @ekuleshov,
I will look into it. For the moment, just use the latest 4.x version of the grouped_list package if you are using Flutter 2

[Dimibe]

@ekuleshov Fixed in version 5.1.0

[ekuleshov-idexx]

Thank you!

[ekuleshov]

Spoke too soon. The package sdk requirement is still left at >=2.17.0 <3.0.0
To support Flutter 2 the dart sdk version need to be up to 2.16