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-rw-r--r--synapse/handlers/room_member.py6
-rw-r--r--synapse/handlers/sync.py2
2 files changed, 7 insertions, 1 deletions
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 3ba5335af7..ba49075a20 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -85,6 +85,12 @@ class RoomMemberHandler(BaseHandler):
             prev_event_ids=prev_event_ids,
         )
 
+        # Check if this event matches the previous membership event for the user.
+        duplicate = yield msg_handler.deduplicate_state_event(event, context)
+        if duplicate is not None:
+            # Discard the new event since this membership change is a no-op.
+            return
+
         yield msg_handler.handle_new_client_event(
             requester,
             event,
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 14f2032afa..b5962f4f5a 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -576,7 +576,7 @@ class SyncHandler(object):
 
             logger.debug("Getting messages up to %d", now_token.to_device_key)
             messages, stream_id = yield self.store.get_new_messages_for_device(
-                user_id, device_id, now_token.to_device_key
+                user_id, device_id, since_stream_id, now_token.to_device_key
             )
             logger.debug("Got messages up to %d: %r", stream_id, messages)
             sync_result_builder.now_token = now_token.copy_and_replace(