From 667329252a228c04fb7feb1bb256e79a82bdf9a1 Mon Sep 17 00:00:00 2001
From: manuroe <manu@matrix.org>
Date: Fri, 29 Jun 2018 15:26:41 +0200
Subject: [PATCH] RoomVC: Fix regression where read receipts can be duplicated

---
 Riot/Model/Room/RoomDataSource.m | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Riot/Model/Room/RoomDataSource.m b/Riot/Model/Room/RoomDataSource.m
index 4fe9680c0..436405d0d 100644
--- a/Riot/Model/Room/RoomDataSource.m
+++ b/Riot/Model/Room/RoomDataSource.m
@@ -107,7 +107,7 @@
 
         @synchronized(bubbles)
         {
-            NSMutableDictionary<NSString* /* eventId */, NSMutableArray<MXReceiptData*> *> *updatedCellDataReadReceipts = [NSMutableDictionary dictionary];
+            NSMutableDictionary<NSString* /* eventId */, NSArray<MXReceiptData*> *> *updatedCellDataReadReceipts = [NSMutableDictionary dictionary];
             for (RoomBubbleCellData *cellData in bubbles)
             {
                 for (NSString *eventId in cellData.readReceipts)
@@ -124,10 +124,11 @@
 
                                 if (!updatedCellDataReadReceipts[eventId])
                                 {
-                                    updatedCellDataReadReceipts[eventId] = [cellData.readReceipts[eventId] mutableCopy];
+                                    updatedCellDataReadReceipts[eventId] = cellData.readReceipts[eventId];
                                 }
 
-                                [updatedCellDataReadReceipts[eventId] removeObject:receiptData];
+                                NSPredicate *predicate = [NSPredicate predicateWithFormat:@"userId!=%@", receiptData.userId];
+                                updatedCellDataReadReceipts[eventId] = [updatedCellDataReadReceipts[eventId] filteredArrayUsingPredicate:predicate];
                                 break;
                             }
                         }