From 67089cb5279c80afabdce4cdb0707f0183a1185a Mon Sep 17 00:00:00 2001
From: Luke Barnard <lukeb@openmarket.com>
Date: Thu, 20 Apr 2017 14:34:59 +0100
Subject: [PATCH] If new RR-RM API not implemented, fallback to RR-only API

---
 src/components/structures/TimelinePanel.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/components/structures/TimelinePanel.js b/src/components/structures/TimelinePanel.js
index 787638f966..e8774cec62 100644
--- a/src/components/structures/TimelinePanel.js
+++ b/src/components/structures/TimelinePanel.js
@@ -536,9 +536,16 @@ var TimelinePanel = React.createClass({
                 this.props.timelineSet.room.roomId,
                 this.state.readMarkerEventId,
                 lastReadEvent
-            ).catch(() => {
+            ).catch((e) => {
+                // /read_markers API is not implemented on this HS, fallback to just RR
+                if (e.errcode === 'M_UNRECOGNIZED') {
+                    return MatrixClientPeg.get().sendReadReceipt(
+                        lastReadEvent
+                    ).catch(() => {
+                        this.last_rr_sent_event_id = undefined;
+                    });
+                }
                 // it failed, so allow retries next time the user is active
-                this.last_rr_sent_event_id = undefined;
                 this.last_rm_sent_event_id = undefined;
             });