From ad963fd23e1058940950356821aadfbda21383f5 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Thu, 28 Mar 2019 12:15:39 +0100
Subject: [PATCH] Don't clear pending_ack on disconnect

Upon reconnecting, we must make sure to send all `pending_ack`,
or Telegram may resend some responses (e.g. causing duplicated
updates).
---
 telethon/network/mtprotosender.py | 2 --
 1 file changed, 2 deletions(-)

diff --git a/telethon/network/mtprotosender.py b/telethon/network/mtprotosender.py
index eba0f51f..7f968197 100644
--- a/telethon/network/mtprotosender.py
+++ b/telethon/network/mtprotosender.py
@@ -266,8 +266,6 @@ class MTProtoSender:
                     state.future.cancel()
 
             self._pending_state.clear()
-            self._pending_ack.clear()
-            self._last_ack = None
             await helpers._cancel(
                 self._log,
                 send_loop_handle=self._send_loop_handle,