fix: Compare groups

packages/moxxmpp/lib/src/roster/roster.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'package:collection/collection.dart';
 import 'package:meta/meta.dart';
 import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/attributes.dart';
@@ -26,13 +27,12 @@ class XmppRosterItem {
 
   @override
   bool operator==(Object other) {
-    // TODO(PapaTutuWawa): Implement the groups
     return other is XmppRosterItem &&
            other.jid == jid &&
            other.name == name &&
            other.subscription == subscription &&
-           other.ask == ask; /*&&
-           other.groups == groups;*/
+           other.ask == ask &&
+           const ListEquality<String>().equals(other.groups, groups);
   }
 
   @override

packages/moxxmpp/pubspec.yaml

@@ -8,6 +8,7 @@ environment:
   sdk: '>=2.17.5 <3.0.0'
 
 dependencies:
+  collection: ^1.17.0
   cryptography: ^2.0.5
   freezed: ^2.1.0+1
   freezed_annotation: ^2.1.0