Update latestPosition when getting reversed room delta (#2860)

Regression test added in matrix-org/complement#551 Should fix #2514?
matrix-org · Nov 4, 2022 · efe28db · efe28db
1 parent b13cb43
commit efe28db
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/syncapi/streams/stream_pdu.go b/syncapi/streams/stream_pdu.go
@@ -264,6 +264,9 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
 	// Work out what the highest stream position is for all of the events in this
 	// room that were returned.
 	latestPosition := r.To
+	if r.Backwards {
+		latestPosition = r.From
+	}
 	updateLatestPosition := func(mostRecentEventID string) {
 		var pos types.StreamPosition
 		if _, pos, err = snapshot.PositionInTopology(ctx, mostRecentEventID); err == nil {