Include the topic event in the prejoin state, per MSC3173. (#11666)

Invites and knocks will now include the topic in the stripped state
send to clients before joining the room.

1 files changed, 2 insertions, 0 deletions

diff --git a/synapse/config/api.py b/synapse/config/api.py

index b18044f982..25538b82d5 100644
--- a/synapse/config/api.py
+++ b/synapse/config/api.py
@@ -107,6 +107,8 @@ _DEFAULT_PREJOIN_STATE_TYPES = [
     EventTypes.Name,
     # Per MSC1772.
     EventTypes.Create,
+    # Per MSC3173.
+    EventTypes.Topic,
 ]