Autocomplete : start fetching users. Still need to adjust UI and manage selection.

matrix-sdk-android-rx/src/main/java/im/vector/matrix/rx/RxRoom.kt

@@ -26,6 +26,10 @@ class RxRoom(private val room: Room) {
         return room.roomSummary.asObservable()
     }
 
+    fun liveRoomMemberIds(): Observable<List<String>> {
+        return room.getRoomMemberIdsLive().asObservable()
+    }
+
 }
 
 fun Room.rx(): RxRoom {