From 17a5d84f3063b4ca1022ec95f77e45358da9f4d9 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Fri, 28 Aug 2020 17:24:02 +0100
Subject: [PATCH] Send cumulative state with new events

---
 roomserver/api/wrapper.go | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/roomserver/api/wrapper.go b/roomserver/api/wrapper.go
index 1d2b07869..9529109e9 100644
--- a/roomserver/api/wrapper.go
+++ b/roomserver/api/wrapper.go
@@ -54,20 +54,23 @@ func SendEventWithState(
 	}
 
 	var ires []InputRoomEvent
+	var stateEventIDs []string
+
 	for _, outlier := range outliers {
 		if haveEventIDs[outlier.EventID()] {
 			continue
 		}
-		ires = append(ires, InputRoomEvent{
+		in := InputRoomEvent{
 			Kind:         stateKind,
 			Event:        outlier.Headered(event.RoomVersion),
 			AuthEventIDs: outlier.AuthEventIDs(),
-		})
-	}
-
-	stateEventIDs := make([]string, len(state.StateEvents))
-	for i := range state.StateEvents {
-		stateEventIDs[i] = state.StateEvents[i].EventID()
+		}
+		if stateKind == KindNew {
+			in.HasState = true
+			in.StateEventIDs = stateEventIDs
+		}
+		ires = append(ires, in)
+		stateEventIDs = append(stateEventIDs, outlier.EventID())
 	}
 
 	ires = append(ires, InputRoomEvent{