pass LL flag to room, to know if we should wait for lazy members at all

src/models/room.js

@@ -278,7 +278,8 @@ Room.prototype.setSyncedMembership = function(membership) {
  * @return {bool} whether or not the members of this room need to be loaded
  */
 Room.prototype.needsOutOfBandMembers = function() {
-    return this.currentState.needsOutOfBandMembers();
+    return this._opts.lazyLoadMembers &&
+        this.currentState.needsOutOfBandMembers();
 };
 
 /**

src/sync.js

@@ -114,6 +114,7 @@ function SyncApi(client, opts) {
 SyncApi.prototype.createRoom = function(roomId) {
     const client = this.client;
     const room = new Room(roomId, client.getUserId(), {
+        lazyLoadMembers: this.opts.lazyLoadMembers,
         pendingEventOrdering: this.opts.pendingEventOrdering,
         timelineSupport: client.timelineSupport,
     });