From 66d36b8e413f7203172cc63290487fc9c6e9202c Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Thu, 5 Nov 2015 17:26:19 +0000
Subject: [PATCH] Be explicit about what we're doing

---
 synapse/handlers/search.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/synapse/handlers/search.py b/synapse/handlers/search.py
index e1fb2db0c9..b7545c111f 100644
--- a/synapse/handlers/search.py
+++ b/synapse/handlers/search.py
@@ -121,7 +121,7 @@ class SearchHandler(BaseHandler):
         room_ids = search_filter.filter_rooms(room_ids)
 
         if batch_group == "room_id":
-            room_ids = room_ids & {batch_group_key}
+            room_ids.intersection_update({batch_group_key})
 
         rank_map = {}  # event_id -> rank of event
         allowed_events = []