add channel to view if new message arrives and the channel is hidden

lib/src/channel_list_view.dart

@@ -377,6 +377,7 @@ class _ChannelListViewState extends State<ChannelListView>
         .on(
       EventType.connectionRecovered,
       EventType.notificationAddedToChannel,
+      EventType.notificationMessageNew,
       EventType.channelVisible,
     )
         .listen((event) {

lib/src/channels_bloc.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:rxdart/rxdart.dart';
 import 'package:stream_chat/stream_chat.dart';
 import 'package:stream_chat_flutter/src/stream_chat.dart';
+import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 /// Widget dedicated to the management of a channel list with pagination
 class ChannelsBloc extends StatefulWidget {
@@ -58,6 +59,8 @@ class ChannelsBlocState extends State<ChannelsBloc>
   Stream<bool> get queryChannelsLoading =>
       _queryChannelsLoadingController.stream;
 
+  List<Channel> _hiddenChannels = [];
+
   /// Calls [client.queryChannels] updating [queryChannelsLoading] stream
   Future<void> queryChannels({
     Map<String, dynamic> filter,
@@ -119,6 +122,23 @@ class ChannelsBlocState extends State<ChannelsBloc>
         final channel = newChannels.removeAt(index);
         newChannels.insert(0, channel);
         _channelsController.add(newChannels);
+      } else {
+        final hiddenIndex = _hiddenChannels.indexWhere((c) => c.cid == e.cid);
+        if (hiddenIndex > -1) {
+          newChannels.insert(0, _hiddenChannels[hiddenIndex]);
+          _hiddenChannels.removeAt(hiddenIndex);
+          _channelsController.add(newChannels);
+        }
+      }
+    }));
+
+    _subscriptions.add(client.on(EventType.channelHidden).listen((event) async {
+      final newChannels = List<Channel>.from(channels);
+      final channelIndex = newChannels.indexWhere((c) => c.cid == event.cid);
+      if (channelIndex > -1) {
+        final channel = newChannels.removeAt(channelIndex);
+        _hiddenChannels.add(channel);
+        _channelsController.add(newChannels);
       }
     }));