From 99534517677cf190612863db1124fba08a36bd33 Mon Sep 17 00:00:00 2001
From: ryanzhao <ryanzhaors@qq.com>
Date: Wed, 4 Aug 2021 14:53:16 +1000
Subject: [PATCH] add comment

---
 SessionMessagingKit/Sending & Receiving/MessageSender.swift | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/SessionMessagingKit/Sending & Receiving/MessageSender.swift b/SessionMessagingKit/Sending & Receiving/MessageSender.swift
index c34c9dde8..72760184f 100644
--- a/SessionMessagingKit/Sending & Receiving/MessageSender.swift	
+++ b/SessionMessagingKit/Sending & Receiving/MessageSender.swift	
@@ -332,6 +332,9 @@ public final class MessageSender : NSObject {
         Storage.shared.addReceivedMessageTimestamp(message.sentTimestamp!, using: transaction)
         // Get the visible message if possible
         if let tsMessage = TSOutgoingMessage.find(withTimestamp: message.sentTimestamp!) {
+            // When the sync message is successfully sent, the hash value of this TSOutgoingMessage
+            // will be replaced by the hash value of the sync message. Since the hash value of the
+            // real message has no use when we delete a message. It is OK to let it be.
             tsMessage.serverHash = message.serverHash
             // Track the open group server message ID
             tsMessage.openGroupServerMessageID = message.openGroupServerMessageID ?? 0