add channel added delete events

lib/src/channels_bloc.dart

@@ -125,7 +125,20 @@ class ChannelsBlocState extends State<ChannelsBloc>
     _subscriptions.add(client.on(EventType.channelDeleted).listen((e) {
       final channel = e.channel;
       _channelsController
-          .add(channels..removeWhere((c) => c.cid == channel.cid));
+          .add(List.from(channels..removeWhere((c) => c.cid == channel.cid)));
+    }));
+
+    _subscriptions
+        .add(client.on(EventType.notificationAddedToChannel).listen((e) async {
+      final channelModel = e.channel;
+      final channel = Channel(
+        client,
+        channelModel.type,
+        channelModel.id,
+        channelModel.extraData,
+      );
+      await channel.watch();
+      _channelsController.add(List.from(channels..insert(0, channel)));
     }));
   }
 

lib/src/stream_channel.dart

@@ -149,14 +149,18 @@ class StreamChannelState extends State<StreamChannel> {
       initialData: widget.channel.state != null,
       builder: (context, snapshot) {
         if (!snapshot.hasData || !snapshot.data) {
-          return Scaffold(
-            body: Center(
+          return Container(
+            height: 30,
+            child: Center(
               child: CircularProgressIndicator(),
             ),
           );
         } else if (snapshot.hasError) {
-          return Center(
-            child: Text(snapshot.error),
+          return Container(
+            height: 30,
+            child: Center(
+              child: Text(snapshot.error),
+            ),
           );
         } else {
           return widget.child;