Room List respect the prefilter for new rooms

src/stores/room-list/RoomListStore.ts

@@ -426,6 +426,10 @@ export class RoomListStoreClass extends AsyncStoreWithClient<IState> {
             return; // don't do anything on rooms that aren't visible
         }
 
+        if (cause === RoomUpdateCause.NewRoom && !this.prefilterConditions.every(c => c.isVisible(room))) {
+            return; // don't do anything on new rooms which ought not to be shown
+        }
+
         const shouldUpdate = await this.algorithm.handleRoomUpdate(room, cause);
         if (shouldUpdate) {
             if (SettingsStore.getValue("advancedRoomListLogging")) {