Add separate deleteDefaultBackground method.

td/generate/scheme/td_api.tl

@@ -9143,6 +9143,9 @@ searchBackground name:string = Background;
 //@for_dark_theme Pass true if the background is set for a dark theme
 setDefaultBackground background:InputBackground type:BackgroundType for_dark_theme:Bool = Background;
 
+//@description Deletes default background for chats @for_dark_theme Pass true if the background is deleted for a dark theme
+deleteDefaultBackground for_dark_theme:Bool = Ok;
+
 //@description Returns backgrounds installed by the user @for_dark_theme Pass true to order returned backgrounds for a dark theme
 getInstalledBackgrounds for_dark_theme:Bool = Backgrounds;
 

td/telegram/BackgroundManager.cpp

@@ -683,11 +683,7 @@ void BackgroundManager::set_background(const td_api::InputBackground *input_back
   TRY_RESULT_PROMISE(promise, type, BackgroundType::get_background_type(background_type, 0));
 
   if (input_background == nullptr) {
-    if (background_type == nullptr) {
-      set_background_id(BackgroundId(), BackgroundType(), for_dark_theme);
-      return promise.set_value(nullptr);
-    }
-    if (type.has_file()) {
+    if (background_type == nullptr || type.has_file()) {
       return promise.set_error(Status::Error(400, "Input background must be non-empty for the background type"));
     }
 
@@ -732,6 +728,11 @@ void BackgroundManager::set_background(const td_api::InputBackground *input_back
   }
 }
 
+void BackgroundManager::delete_background(bool for_dark_theme, Promise<Unit> &&promise) {
+  set_background_id(BackgroundId(), BackgroundType(), for_dark_theme);
+  promise.set_value(Unit());
+}
+
 Result<DialogId> BackgroundManager::get_background_dialog(DialogId dialog_id) {
   if (!td_->messages_manager_->have_dialog_force(dialog_id, "set_dialog_background")) {
     return Status::Error(400, "Chat not found");

td/telegram/BackgroundManager.h

@@ -44,6 +44,8 @@ class BackgroundManager final : public Actor {
   void set_background(const td_api::InputBackground *input_background, const td_api::BackgroundType *background_type,
                       bool for_dark_theme, Promise<td_api::object_ptr<td_api::background>> &&promise);
 
+  void delete_background(bool for_dark_theme, Promise<Unit> &&promise);
+
   void remove_background(BackgroundId background_id, Promise<Unit> &&promise);
 
   void reset_backgrounds(Promise<Unit> &&promise);

td/telegram/Td.cpp

@@ -8790,6 +8790,12 @@ void Td::on_request(uint64 id, td_api::setDefaultBackground &request) {
                                       std::move(promise));
 }
 
+void Td::on_request(uint64 id, const td_api::deleteDefaultBackground &request) {
+  CHECK_IS_USER();
+  CREATE_OK_REQUEST_PROMISE();
+  background_manager_->delete_background(request.for_dark_theme_, std::move(promise));
+}
+
 void Td::on_request(uint64 id, const td_api::removeInstalledBackground &request) {
   CHECK_IS_USER();
   CREATE_OK_REQUEST_PROMISE();

td/telegram/Td.h

@@ -1599,6 +1599,8 @@ class Td final : public Actor {
 
   void on_request(uint64 id, td_api::setDefaultBackground &request);
 
+  void on_request(uint64 id, const td_api::deleteDefaultBackground &request);
+
   void on_request(uint64 id, const td_api::removeInstalledBackground &request);
 
   void on_request(uint64 id, const td_api::resetInstalledBackgrounds &request);

td/telegram/cli.cpp

@@ -3128,6 +3128,8 @@ class CliClient final : public Actor {
       BackgroundType background_type;
       get_args(args, input_background, background_type);
       send_request(td_api::make_object<td_api::setDefaultBackground>(input_background, background_type, op == "sdbd"));
+    } else if (op == "ddb" || op == "ddbd") {
+      send_request(td_api::make_object<td_api::deleteDefaultBackground>(op == "ddbd"));
     } else if (op == "rib") {
       int64 background_id;
       get_args(args, background_id);