From 7941a70fa8b297b0dec320a9b7dda01df3efe1e4 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Tue, 5 May 2020 14:17:27 +0100 Subject: Fix bug in EventContext.deserialize. (#7393) This caused `prev_state_ids` to be incorrect if the state event was not replacing an existing state entry. --- synapse/events/snapshot.py | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'synapse/events') diff --git a/synapse/events/snapshot.py b/synapse/events/snapshot.py index 9ea85e93e6..7c5f620d09 100644 --- a/synapse/events/snapshot.py +++ b/synapse/events/snapshot.py @@ -322,11 +322,14 @@ class _AsyncEventContextImpl(EventContext): self._current_state_ids = yield self._storage.state.get_state_ids_for_group( self.state_group ) - if self._prev_state_id and self._event_state_key is not None: + if self._event_state_key is not None: self._prev_state_ids = dict(self._current_state_ids) key = (self._event_type, self._event_state_key) - self._prev_state_ids[key] = self._prev_state_id + if self._prev_state_id: + self._prev_state_ids[key] = self._prev_state_id + else: + self._prev_state_ids.pop(key, None) else: self._prev_state_ids = self._current_state_ids -- cgit 1.4.1