only lazy load the members when viewing a joined room

src/components/structures/RoomView.js

@@ -312,6 +312,9 @@ module.exports = React.createClass({
                 // Stop peeking because we have joined this room previously
                 MatrixClientPeg.get().stopPeeking();
                 this.setState({isPeeking: false});
+
+                //viewing a previously joined room, try to lazy load members
+                MatrixClientPeg.get().loadRoomMembersIfNeeded(room.roomId);
             }
         }
     },

src/stores/RoomViewStore.js

@@ -133,7 +133,6 @@ class RoomViewStore extends Store {
 
     _viewRoom(payload) {
         if (payload.room_id) {
-            MatrixClientPeg.get().loadRoomMembersIfNeeded(payload.room_id);
             const newState = {
                 roomId: payload.room_id,
                 roomAlias: payload.room_alias,