From 4c45d8722cbe8c0eb4edd000f286ef96cf173ffb Mon Sep 17 00:00:00 2001
From: Stefan Ceriu <stefanc@matrix.org>
Date: Mon, 26 Jun 2023 12:27:14 +0300
Subject: [PATCH] Reuse previously build room summaries for diffs that contain
 invalidations

---
 .../Room/RoomSummary/RoomSummaryProvider.swift      | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/ElementX/Sources/Services/Room/RoomSummary/RoomSummaryProvider.swift b/ElementX/Sources/Services/Room/RoomSummary/RoomSummaryProvider.swift
index aeceb478f..e78c765b0 100644
--- a/ElementX/Sources/Services/Room/RoomSummary/RoomSummaryProvider.swift
+++ b/ElementX/Sources/Services/Room/RoomSummary/RoomSummaryProvider.swift
@@ -177,7 +177,18 @@ class RoomSummaryProvider: RoomSummaryProviderProtocol {
         case .filled(let roomId):
             return buildRoomSummaryForIdentifier(roomId, invalidated: false)
         case .invalidated(let roomId):
-            return buildRoomSummaryForIdentifier(roomId, invalidated: true)
+            guard let cachedRoom = rooms.first(where: { $0.id == roomId }) else {
+                return buildRoomSummaryForIdentifier(roomId, invalidated: true)
+            }
+            
+            switch cachedRoom {
+            case .empty:
+                return .empty
+            case .filled(let details):
+                return .invalidated(details: details)
+            case .invalidated:
+                return cachedRoom
+            }
         }
     }