From 7621fe268266bccb9043797c7b4429a5f1bc5fe4 Mon Sep 17 00:00:00 2001
From: Kegan Dougal <7190048+kegsay@users.noreply.github.com>
Date: Tue, 17 Sep 2024 12:11:25 +0100
Subject: [PATCH] User bumpStamp if it is present

---
 .../room-list/algorithms/tag-sorting/RecentAlgorithm.ts     | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/stores/room-list/algorithms/tag-sorting/RecentAlgorithm.ts b/src/stores/room-list/algorithms/tag-sorting/RecentAlgorithm.ts
index d30703d288..82fe885a5b 100644
--- a/src/stores/room-list/algorithms/tag-sorting/RecentAlgorithm.ts
+++ b/src/stores/room-list/algorithms/tag-sorting/RecentAlgorithm.ts
@@ -69,6 +69,12 @@ const getLastTs = (r: Room, userId: string): number => {
         if (!r?.timeline) {
             return Number.MAX_SAFE_INTEGER;
         }
+        // MSC4186: Simplified Sliding Sync sets this.
+        // If it's present, sort by it.
+        const bumpStamp = r.getBumpStamp();
+        if (bumpStamp) {
+            return bumpStamp;
+        }
 
         // If the room hasn't been joined yet, it probably won't have a timeline to
         // parse. We'll still fall back to the timeline if this fails, but chances