2 files changed, 10 insertions, 3 deletions
diff --git a/synapse/federation/send_queue.py b/synapse/federation/send_queue.py
index 0bb468385d..6f5995735a 100644
--- a/synapse/federation/send_queue.py
+++ b/synapse/federation/send_queue.py
@@ -32,7 +32,7 @@ Events are replicated via a separate events stream.
 import logging
 from collections import namedtuple
 
-from six import iteritems, itervalues
+from six import iteritems
 
 from sortedcontainers import SortedDict
 
@@ -117,7 +117,7 @@ class FederationRemoteSendQueue(object):
 
             user_ids = set(
                 user_id
-                for uids in itervalues(self.presence_changed)
+                for uids in self.presence_changed.values()
                 for user_id in uids
             )
 
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 648debc8aa..ef20c2296c 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -745,9 +745,16 @@ class SyncHandler(object):
                 state_ids = {}
                 if lazy_load_members:
                     if types:
+                        # We're returning an incremental sync, with no "gap" since
+                        # the previous sync, so normally there would be no state to return
+                        # But we're lazy-loading, so the client might need some more
+                        # member events to understand the events in this timeline.
+                        # So we fish out all the member events corresponding to the
+                        # timeline here, and then dedupe any redundant ones below.
+
                         state_ids = yield self.store.get_state_ids_for_event(
                             batch.events[0].event_id, types=types,
-                            filtered_types=filtered_types,
+                            filtered_types=None,  # we only want members!
                         )
 
             if lazy_load_members and not include_redundant_members: