From af7e26bc49b441a4d008073fe8b857b4cdf5e198 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Fri, 19 Mar 2021 02:51:50 +0300
Subject: [PATCH] Try to process versioned updates with old version.

---
 td/telegram/GroupCallManager.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/td/telegram/GroupCallManager.cpp b/td/telegram/GroupCallManager.cpp
index 3055e6baf..bc776131d 100644
--- a/td/telegram/GroupCallManager.cpp
+++ b/td/telegram/GroupCallManager.cpp
@@ -1532,8 +1532,8 @@ bool GroupCallManager::process_pending_group_call_participant_updates(InputGroup
       for (auto &participant_it : participants) {
         auto &participant = participant_it.second;
         on_participant_speaking_in_group_call(input_group_call_id, participant);
-        if (participant.is_self) {
-          process_my_group_call_participant(input_group_call_id, std::move(participant));
+        if (participant.is_self || participant.joined_date != 0) {
+          diff += process_group_call_participant(input_group_call_id, std::move(participant));
         }
       }
       LOG(INFO) << "Ignore already applied updateGroupCallParticipants with version " << version << " in "
@@ -1856,6 +1856,11 @@ int GroupCallManager::process_group_call_participant(InputGroupCallId input_grou
         return -1;
       }
 
+      if (old_participant.version > participant.version) {
+        LOG(INFO) << "Ignore outdated update of " << old_participant.dialog_id;
+        return 0;
+      }
+
       if (old_participant.dialog_id != participant.dialog_id) {
         on_remove_group_call_participant(input_group_call_id, old_participant.dialog_id);
         on_add_group_call_participant(input_group_call_id, participant.dialog_id);