Add updateSelectedBackground.

GitOrigin-RevId: 78ca327ff6da27da19fc6a05e2354af969b42bfb

td/generate/scheme/td_api.tl

@@ -2671,6 +2671,9 @@ updateFavoriteStickers sticker_ids:vector<int32> = Update;
 //@description The list of saved animations was updated @animation_ids The new list of file identifiers of saved animations
 updateSavedAnimations animation_ids:vector<int32> = Update;
 
+//@description The selected background has changed @background The new selected background; may be null
+updateSelectedBackground background:background = 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
 updateLanguagePackStrings localization_target:string language_pack_id:string strings:vector<languagePackString> = Update;
 

td/telegram/BackgroundManager.cpp

@@ -205,30 +205,40 @@ class BackgroundManager::BackgroundLogEvent {
 
   template <class StorerT>
   void store(StorerT &storer) const {
+    bool has_file_id = file_id_.is_valid();
     BEGIN_STORE_FLAGS();
     STORE_FLAG(is_creator_);
     STORE_FLAG(is_default_);
     STORE_FLAG(is_dark_);
+    STORE_FLAG(has_file_id);
     END_STORE_FLAGS();
     td::store(background_id_, storer);
     td::store(access_hash_, storer);
     td::store(name_, storer);
-    storer.context()->td().get_actor_unsafe()->documents_manager_->store_document(file_id_, storer);
+    if (has_file_id) {
+      storer.context()->td().get_actor_unsafe()->documents_manager_->store_document(file_id_, storer);
+    }
     td::store(type_, storer);
     td::store(set_type_, storer);
   }
 
   template <class ParserT>
   void parse(ParserT &parser) {
+    bool has_file_id;
     BEGIN_PARSE_FLAGS();
     PARSE_FLAG(is_creator_);
     PARSE_FLAG(is_default_);
     PARSE_FLAG(is_dark_);
+    PARSE_FLAG(has_file_id);
     END_PARSE_FLAGS();
     td::parse(background_id_, parser);
     td::parse(access_hash_, parser);
     td::parse(name_, parser);
-    file_id_ = parser.context()->td().get_actor_unsafe()->documents_manager_->parse_document(parser);
+    if (has_file_id) {
+      file_id_ = parser.context()->td().get_actor_unsafe()->documents_manager_->parse_document(parser);
+    } else {
+      file_id_ = FileId();
+    }
     td::parse(type_, parser);
     td::parse(set_type_, parser);
   }
@@ -266,6 +276,8 @@ void BackgroundManager::start_up() {
       file_id_to_background_id_.emplace(background->file_id, background->id);
     }
   }
+
+  send_update_selected_background();
 }
 
 void BackgroundManager::tear_down() {
@@ -371,6 +383,14 @@ BackgroundId BackgroundManager::search_background(const string &name, Promise<Un
   return BackgroundId();
 }
 
+td_api::object_ptr<td_api::updateSelectedBackground> BackgroundManager::get_update_selected_background() const {
+  return td_api::make_object<td_api::updateSelectedBackground>(get_background_object(set_background_id_));
+}
+
+void BackgroundManager::send_update_selected_background() const {
+  send_closure(G()->td(), &Td::send_update, get_update_selected_background());
+}
+
 Result<FileId> BackgroundManager::prepare_input_file(const tl_object_ptr<td_api::InputFile> &input_file) {
   auto r_file_id = td_->file_manager_->get_input_file_id(FileType::Background, input_file, {}, false, false);
   if (r_file_id.is_error()) {
@@ -506,6 +526,7 @@ void BackgroundManager::set_background_id(BackgroundId background_id, const Back
   set_background_type_ = type;
 
   save_background_id();
+  send_update_selected_background();
 }
 
 void BackgroundManager::upload_background_file(FileId file_id, const BackgroundType &type, Promise<Unit> &&promise) {

td/telegram/BackgroundManager.h

@@ -87,6 +87,10 @@ class BackgroundManager : public Actor {
                                      telegram_api::object_ptr<telegram_api::InputWallPaper> &&input_wallpaper,
                                      Promise<Unit> &&promise) const;
 
+  td_api::object_ptr<td_api::updateSelectedBackground> get_update_selected_background() const;
+
+  void send_update_selected_background() const;
+
   BackgroundId add_solid_background(int32 color);
 
   Background *add_background(BackgroundId background_id);