Don't filter state in /context response (#14461)

We don't filter state usually, so doing so here is a waste of time. This is not much of an issue for clients that enable lazy loading of members, since there will be fewer state events.
matrix-org · Nov 16, 2022 · 945a092 · 945a092
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diff --git a/changelog.d/14461.misc b/changelog.d/14461.misc
@@ -0,0 +1 @@
+Improve performance of `/context` in large rooms.
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
@@ -1451,7 +1451,7 @@ async def filter_evts(events: List[EventBase]) -> List[EventBase]:
             events_before=events_before,
             event=event,
             events_after=events_after,
-            state=await filter_evts(state_events),
+            state=state_events,
             aggregations=aggregations,
             start=await token.copy_and_replace(
                 StreamKeyType.ROOM, results.start