fix(core): use copyWith while setting controller items.

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat_flutter_core/lib/src/stream_channel_list_controller.dart

@@ -163,13 +163,14 @@ class StreamChannelListController extends PagedValueNotifier<int, Channel> {
     }
   }
 
-  /// Replaces the previously loaded channels with [channels] and updates
-  /// the nextPageKey.
+  /// Replaces the previously loaded channels with the passed [channels].
   set channels(List<Channel> channels) {
-    value = PagedValue(
-      items: channels,
-      nextPageKey: channels.length,
-    );
+    if (value.isSuccess) {
+      final currentValue = value.asSuccess;
+      value = currentValue.copyWith(items: channels);
+    } else {
+      value = PagedValue(items: channels);
+    }
   }
 
   /// Returns/Creates a new Channel and starts watching it.

packages/stream_chat_flutter_core/lib/src/stream_user_list_controller.dart

@@ -153,12 +153,13 @@ class StreamUserListController extends PagedValueNotifier<int, User> {
     return super.refresh(resetValue: resetValue);
   }
 
-  /// Replaces the previously loaded users with [users] and updates
-  /// the nextPageKey.
+  /// Replaces the previously loaded users with the passed [users].
   set users(List<User> users) {
-    value = PagedValue(
-      items: users,
-      nextPageKey: users.length,
-    );
+    if (value.isSuccess) {
+      final currentValue = value.asSuccess;
+      value = currentValue.copyWith(items: users);
+    } else {
+      value = PagedValue(items: users);
+    }
   }
 }