Filter events_before and events_after in /context requests

While the current version of the spec doesn't say much about how this endpoint uses filters (see matrix-org/matrix-spec-proposals#2338), the current implementation is that some fields of an EventFilter apply (the ones that are used when running the SQL query) and others don't (the ones that are used by the filter itself) because we don't call event_filter.filter(...). This seems counter-intuitive and probably not what we want so this commit fixes it.

synapse/handlers/room.py

@@ -874,8 +874,10 @@ def filter_evts(events):
             room_id, event_id, before_limit, after_limit, event_filter
         )
 
-        results["events_before"] = yield filter_evts(results["events_before"])
-        results["events_after"] = yield filter_evts(results["events_after"])
+        filtered_before_events = event_filter.filter(results["events_before"])
+        results["events_before"] = yield filter_evts(filtered_before_events)
+        filtered_after_events = event_filter.filter(results["events_after"])
+        results["events_after"] = yield filter_evts(filtered_after_events)
         results["event"] = event
 
         if results["events_after"]: