From c3463dec63eb17081ddaba71910fbdd2c9026354 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Mon, 24 Feb 2020 14:53:38 +0400
Subject: [PATCH] Force zero unread count if read till end.

---
 Telegram/SourceFiles/data/data_histories.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Telegram/SourceFiles/data/data_histories.cpp b/Telegram/SourceFiles/data/data_histories.cpp
index 434a8b33f5..ee3da94216 100644
--- a/Telegram/SourceFiles/data/data_histories.cpp
+++ b/Telegram/SourceFiles/data/data_histories.cpp
@@ -135,6 +135,17 @@ void Histories::readInboxTill(
 		bool force) {
 	Expects(IsServerMsgId(tillId) || (!tillId && !force));
 
+	const auto syncGuard = gsl::finally([&] {
+		if (history->unreadCount() > 0) {
+			if (const auto last = history->lastServerMessage()) {
+				if (last->id == tillId) {
+					history->setUnreadCount(0);
+					history->updateChatListEntry();
+				}
+			}
+		}
+	});
+
 	history->session().notifications().clearIncomingFromHistory(history);
 
 	const auto needsRequest = history->readInboxTillNeedsRequest(tillId);