From de8b68a492d34632e2d550cc529e46e77ee9d919 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Wed, 22 Mar 2023 21:40:05 +0300
Subject: [PATCH] Send updateLanguagePackStrings when language pack is loaded
 for the first time.

---
 td/generate/scheme/td_api.tl        |  2 +-
 td/telegram/LanguagePackManager.cpp | 13 +++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index d976c7cd2..cf73ab456 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -5530,7 +5530,7 @@ updateSelectedBackground for_dark_theme:Bool background:background = Update;
 //@description The list of available chat themes has changed @chat_themes The new list of chat themes
 updateChatThemes chat_themes:vector<chatTheme> = Update;
 
-//@description Some language pack strings have been updated @localization_target Localization target to which the language pack belongs @language_pack_id Identifier of the updated language pack @strings List of changed language pack strings
+//@description Some language pack strings have been updated @localization_target Localization target to which the language pack belongs @language_pack_id Identifier of the updated language pack @strings List of changed language pack strings; empty if all strings have changed
 updateLanguagePackStrings localization_target:string language_pack_id:string strings:vector<languagePackString> = Update;
 
 //@description The connection state has changed. This update must be used only to show a human-readable description of the connection state @state The new connection state
diff --git a/td/telegram/LanguagePackManager.cpp b/td/telegram/LanguagePackManager.cpp
index 71e9a25ba..1761819f2 100644
--- a/td/telegram/LanguagePackManager.cpp
+++ b/td/telegram/LanguagePackManager.cpp
@@ -1384,6 +1384,7 @@ void LanguagePackManager::on_get_language_pack_strings(
     std::lock_guard<std::mutex> lock(language->mutex_);
     int32 key_count_delta = 0;
     if (language->version_ < version || !keys.empty()) {
+      auto is_first = language->version_ == -1;
       vector<td_api::object_ptr<td_api::languagePackString>> strings;
       if (language->version_ < version) {
         LOG(INFO) << "Set language pack " << language_code << " version to " << version;
@@ -1482,18 +1483,18 @@ void LanguagePackManager::on_get_language_pack_strings(
         language->key_count_ = new_key_count;
       }
 
-      if (is_diff) {
-        send_closure(
-            G()->td(), &Td::send_update,
-            td_api::make_object<td_api::updateLanguagePackStrings>(language_pack, language_code, std::move(strings)));
-      }
-
       if (keys.empty() && !is_diff) {
         CHECK(new_database_version >= 0);
         language->is_full_ = true;
         language->deleted_strings_.clear();
       }
       new_is_full = language->is_full_;
+
+      if (is_diff || (new_is_full && is_first)) {
+        send_closure(
+            G()->td(), &Td::send_update,
+            td_api::make_object<td_api::updateLanguagePackStrings>(language_pack, language_code, std::move(strings)));
+      }
     }
   }
   if (is_custom_language_code(language_code) && new_database_version == -1) {