From 2440ebda56157fa68f4dd1a534ce5993902a2e26 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Thu, 22 Sep 2022 06:39:40 +0300
Subject: [PATCH] Never replace ExtendedMedia media with preview.

---
 td/telegram/MessageContent.cpp       | 3 ++-
 td/telegram/MessageExtendedMedia.cpp | 6 ++++++
 td/telegram/MessageExtendedMedia.h   | 6 ++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/td/telegram/MessageContent.cpp b/td/telegram/MessageContent.cpp
index 7aaa81740..e261e3a73 100644
--- a/td/telegram/MessageContent.cpp
+++ b/td/telegram/MessageContent.cpp
@@ -3219,7 +3219,8 @@ void merge_message_contents(Td *td, const MessageContent *old_content, MessageCo
     }
     case MessageContentType::Invoice: {
       const auto *old_ = static_cast<const MessageInvoice *>(old_content);
-      const auto *new_ = static_cast<const MessageInvoice *>(new_content);
+      auto *new_ = static_cast<MessageInvoice *>(new_content);
+      new_->input_invoice.extended_media.update_from(old_->input_invoice.extended_media);
       if (old_->input_invoice != new_->input_invoice) {
         need_update = true;
       }
diff --git a/td/telegram/MessageExtendedMedia.cpp b/td/telegram/MessageExtendedMedia.cpp
index f85cf1d24..5ae34a8ae 100644
--- a/td/telegram/MessageExtendedMedia.cpp
+++ b/td/telegram/MessageExtendedMedia.cpp
@@ -89,6 +89,12 @@ MessageExtendedMedia::MessageExtendedMedia(
   }
 }
 
+void MessageExtendedMedia::update_from(const MessageExtendedMedia &old_extended_media) {
+  if (!is_media() && old_extended_media.is_media()) {
+    *this = old_extended_media;
+  }
+}
+
 td_api::object_ptr<td_api::MessageExtendedMedia> MessageExtendedMedia::get_message_extended_media_object(
     Td *td, bool skip_bot_commands, int32 max_media_timestamp) const {
   if (type_ == Type::Empty) {
diff --git a/td/telegram/MessageExtendedMedia.h b/td/telegram/MessageExtendedMedia.h
index 1ce17d670..b005904d8 100644
--- a/td/telegram/MessageExtendedMedia.h
+++ b/td/telegram/MessageExtendedMedia.h
@@ -36,6 +36,10 @@ class MessageExtendedMedia {
 
   friend bool operator==(const MessageExtendedMedia &lhs, const MessageExtendedMedia &rhs);
 
+  bool is_media() const {
+    return type_ != Type::Empty && type_ != Type::Preview;
+  }
+
  public:
   MessageExtendedMedia() = default;
 
@@ -46,6 +50,8 @@ class MessageExtendedMedia {
     return type_ == Type::Empty;
   }
 
+  void update_from(const MessageExtendedMedia &old_extended_media);
+
   td_api::object_ptr<td_api::MessageExtendedMedia> get_message_extended_media_object(Td *td, bool skip_bot_commands,
                                                                                      int32 max_media_timestamp) const;