From 6bd7e04875f0a323fc316d5be73358330134c9c8 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Fri, 10 Dec 2021 17:30:38 +0300
Subject: [PATCH] Ensure that online member count is reasonable.

---
 td/telegram/MessagesManager.cpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index 87efc9721..ab7d13bfd 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -12093,6 +12093,30 @@ void MessagesManager::set_dialog_online_member_count(DialogId dialog_id, int32 o
     return;
   }
 
+  if (online_member_count < 0) {
+    LOG(ERROR) << "Receive online_member_count = " << online_member_count << " in " << dialog_id;
+    online_member_count = 0;
+  }
+
+  switch (dialog_id.get_type()) {
+    case DialogType::Chat: {
+      auto participant_count = td_->contacts_manager_->get_chat_participant_count(dialog_id.get_chat_id());
+      if (online_member_count > participant_count) {
+        online_member_count = participant_count;
+      }
+      break;
+    }
+    case DialogType::Channel: {
+      auto participant_count = td_->contacts_manager_->get_channel_participant_count(dialog_id.get_channel_id());
+      if (participant_count != 0 && online_member_count > participant_count) {
+        online_member_count = participant_count;
+      }
+      break;
+    }
+    default:
+      break;
+  }
+
   auto &info = dialog_online_member_counts_[dialog_id];
   LOG(INFO) << "Change number of online members from " << info.online_member_count << " to " << online_member_count
             << " in " << dialog_id << " from " << source;