fix for markAllRead()

packages/stream_chat/lib/src/client/client.dart

@@ -1376,6 +1376,8 @@ class ClientState {
     _listenChannelHidden();
 
     _listenUserUpdated();
+
+    _listenAllChannelsRead();
   }
 
   final _subscriptions = <StreamSubscription>[];
@@ -1405,6 +1407,18 @@ class ClientState {
     }));
   }
 
+  void _listenAllChannelsRead() {
+    _subscriptions
+        .add(_client.on(EventType.notificationMarkRead).listen((event) {
+      if (event.cid == null) {
+        channels
+          .forEach((key, value) {
+            value.state?.unreadCount = 0;
+          });
+      }
+    }));
+  }
+
   void _listenChannelDeleted() {
     _subscriptions.add(_client
         .on(