Update chat panel with current channel

crates/call/src/call.rs

@@ -442,6 +442,8 @@ impl ActiveCall {
                         .location
                         .as_ref()
                         .and_then(|location| location.upgrade());
+                    let channel_id = room.update(cx, |room, cx| room.channel_id());
+                    cx.emit(Event::RoomJoined { channel_id });
                     room.update(cx, |room, cx| room.set_location(location.as_ref(), cx))
                 }
             } else {

crates/call/src/room.rs

@@ -26,6 +26,9 @@ pub const RECONNECT_TIMEOUT: Duration = Duration::from_secs(30);
 
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum Event {
+    RoomJoined {
+        channel_id: Option<u64>,
+    },
     ParticipantLocationChanged {
         participant_id: proto::PeerId,
     },