fix: Handle roster items staying the same

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

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'package:meta/meta.dart';
 import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/attributes.dart';
 import 'package:moxxmpp/src/managers/base.dart';
@@ -14,13 +15,38 @@ import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 import 'package:moxxmpp/src/types/result.dart';
 
+@immutable
 class XmppRosterItem {
-  XmppRosterItem({ required this.jid, required this.subscription, this.ask, this.name, this.groups = const [] });
+  const XmppRosterItem({ required this.jid, required this.subscription, this.ask, this.name, this.groups = const [] });
   final String jid;
   final String? name;
   final String subscription;
   final String? ask;
   final List<String> groups;
+
+  @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;*/
+  }
+
+  @override
+  int get hashCode => jid.hashCode ^ name.hashCode ^ subscription.hashCode ^ ask.hashCode ^ groups.hashCode;
+  
+  @override
+  String toString() {
+    return 'XmppRosterItem('
+           'jid: $jid, '
+           'name: $name, '
+           'subscription: $subscription, '
+           'ask: $ask, '
+           'groups: $groups)';
+  }
 }
 
 enum RosterRemovalResult {

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

@@ -114,7 +114,7 @@ abstract class BaseRosterStateManager {
         null,
         item,
       );
-    } else {
+    } else if (_currentRoster![index] != item) {
       // The item is updated
       _currentRoster![index] = item;
       return _RosterProcessTriple(
@@ -123,6 +123,13 @@ abstract class BaseRosterStateManager {
         null,
       );
     }
+
+    // Item has not been modified or added
+    return const _RosterProcessTriple(
+      null,
+      null,
+      null,
+    );
   }
 
   /// Handles a roster push from the RosterManager.

packages/moxxmpp/test/roster_state_test.dart

@@ -95,4 +95,59 @@ void main() {
     expect(rs.getRosterItems().indexWhere((item) => item.jid == 'testuser2@server2.example') != -1, true);
     expect(rs.getRosterItems().indexWhere((item) => item.jid == 'testuser3@server3.example') != -1, true);
   });
+
+  test('Test a roster fetch if we already have a roster', () async {
+    XmppEvent? event;
+    final rs = TestingRosterStateManager('aaaaa', [
+      XmppRosterItem(
+        jid: 'testuser@server.example',
+        subscription: 'both',
+      ),
+      XmppRosterItem(
+        jid: 'testuser2@server2.example',
+        subscription: 'to',
+      ),
+      XmppRosterItem(
+        jid: 'testuser3@server3.example',
+        subscription: 'from',
+      ),
+    ]);
+    rs.register((_event) {
+      event = _event;
+    });
+
+    // Fetch the roster
+    await rs.handleRosterFetch(
+      RosterRequestResult(
+        [
+          XmppRosterItem(
+            jid: 'testuser@server.example',
+            subscription: 'both',
+          ),
+          XmppRosterItem(
+            jid: 'testuser2@server2.example',
+            subscription: 'to',
+          ),
+          XmppRosterItem(
+            jid: 'testuser3@server3.example',
+            subscription: 'both',
+          ),
+          XmppRosterItem(
+            jid: 'testuser4@server4.example',
+            subscription: 'both',
+          ),
+        ],
+        'bbbbb',
+      ),
+    );
+
+    expect(event is RosterUpdatedEvent, true);
+    final updateEvent = event as RosterUpdatedEvent;
+
+    expect(updateEvent.added.length, 1);
+    expect(updateEvent.added.first.jid, 'testuser4@server4.example');
+    expect(updateEvent.modified.length, 1);
+    expect(updateEvent.modified.first.jid, 'testuser3@server3.example');
+    expect(updateEvent.removed.isEmpty, true);
+  });
 }