Support new service messages.

Telegram/Resources/langs/lang.strings

@@ -2496,6 +2496,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_action_stake_game_won_you" = "You won {amount}";
 "lng_action_stake_game_lost" = "{from} lost {amount}";
 "lng_action_stake_game_lost_you" = "You lost {amount}";
+"lng_action_change_creator" = "{from} made {user} the new main admin of the group.";
+"lng_action_new_creator_pending" = "{user} will become the new main admin in 7 days if {from} does not return.";
 
 "lng_stake_game_title" = "Emoji Stake";
 "lng_stake_game_beta" = "Beta";

Telegram/SourceFiles/export/data/export_data_types.cpp

@@ -1850,9 +1850,13 @@ ServiceAction ParseServiceAction(
 		content.offerPrice = CreditsAmountFromTL(data.vprice());
 		result.content = content;
 	}, [&](const MTPDmessageActionNewCreatorPending &data) {
-		AssertIsDebug();
+		auto content = ActionNewCreatorPending();
+		content.newCreatorId = data.vnew_creator_id().v;
+		result.content = content;
 	}, [&](const MTPDmessageActionChangeCreator &data) {
-		AssertIsDebug();
+		auto content = ActionChangeCreator();
+		content.newCreatorId = data.vnew_creator_id().v;
+		result.content = content;
 	}, [](const MTPDmessageActionEmpty &data) {});
 	return result;
 }

Telegram/SourceFiles/export/data/export_data_types.h

@@ -738,6 +738,14 @@ struct ActionSuggestBirthday {
 	Birthday birthday;
 };
 
+struct ActionNewCreatorPending {
+	UserId newCreatorId = 0;
+};
+
+struct ActionChangeCreator {
+	UserId newCreatorId = 0;
+};
+
 struct ServiceAction {
 	std::variant<
 		v::null_t,
@@ -791,7 +799,9 @@ struct ServiceAction {
 		ActionSuggestedPostApproval,
 		ActionSuggestedPostSuccess,
 		ActionSuggestedPostRefund,
-		ActionSuggestBirthday> content;
+		ActionSuggestBirthday,
+		ActionNewCreatorPending,
+		ActionChangeCreator> content;
 };
 
 ServiceAction ParseServiceAction(

Telegram/SourceFiles/export/output/export_output_html.cpp

@@ -1553,6 +1553,16 @@ auto HtmlWriter::Wrap::pushMessage(
 			}() + (data.birthday.year()
 				? (' ' + QByteArray::number(data.birthday.year()))
 				: QByteArray());
+	}, [&](const ActionNewCreatorPending &data) {
+		return peers.wrapUserName(data.newCreatorId)
+			+ " will become the new main admin in 7 days if "
+			+ serviceFrom
+			+ " does not return";
+	}, [&](const ActionChangeCreator &data) {
+		return serviceFrom
+			+ " made "
+			+ peers.wrapUserName(data.newCreatorId)
+			+ " the new main admin of the group";
 	}, [](v::null_t) { return QByteArray(); });
 
 	if (!serviceText.isEmpty()) {

Telegram/SourceFiles/export/output/export_output_json.cpp

@@ -743,6 +743,14 @@ QByteArray SerializeMessage(
 		if (const auto year = data.birthday.year()) {
 			push("year", year);
 		}
+	}, [&](const ActionNewCreatorPending &data) {
+		pushActor();
+		pushAction("new_creator_pending");
+		pushBare("new_creator", wrapUserName(data.newCreatorId));
+	}, [&](const ActionChangeCreator &data) {
+		pushActor();
+		pushAction("change_creator");
+		pushBare("new_creator", wrapUserName(data.newCreatorId));
 	}, [](v::null_t) {});
 
 	if (v::is_null(message.action.content)) {

Telegram/SourceFiles/history/history_item.cpp

@@ -6601,13 +6601,33 @@ void HistoryItem::setServiceMessageByAction(const MTPmessageAction &action) {
 		return result;
 	};
 
-	auto prepareNewCreatorPending = [&](const MTPDmessageActionNewCreatorPending &action) {
-		auto result = PreparedServiceText{ .text = { u"new creator pending"_q } };
+	auto prepareNewCreatorPending = [this](const MTPDmessageActionNewCreatorPending &action) {
+		auto result = PreparedServiceText();
+		auto user = _history->owner().user(action.vnew_creator_id().v);
+		result.links.push_back(fromLink());
+		result.links.push_back(user->createOpenLink());
+		result.text = tr::lng_action_new_creator_pending(
+			tr::now,
+			lt_user,
+			tr::link(user->name(), 2),
+			lt_from,
+			fromLinkText(),
+			tr::marked);
 		return result;
 	};
 
-	auto prepareChangeCreator = [&](const MTPDmessageActionChangeCreator &action) {
-		auto result = PreparedServiceText{ .text = { u"new creator"_q } };
+	auto prepareChangeCreator = [this](const MTPDmessageActionChangeCreator &action) {
+		auto result = PreparedServiceText();
+		auto user = _history->owner().user(action.vnew_creator_id().v);
+		result.links.push_back(fromLink());
+		result.links.push_back(user->createOpenLink());
+		result.text = tr::lng_action_change_creator(
+			tr::now,
+			lt_from,
+			fromLinkText(),
+			lt_user,
+			tr::link(user->name(), 2),
+			tr::marked);
 		return result;
 	};