Add user to group on appointing of admin.

Telegram/SourceFiles/boxes/peers/add_participants_box.cpp

@@ -776,6 +776,7 @@ void AddSpecialBoxSearchController::searchQuery(const QString &query) {
 		_requestId = 0;
 		_participantsLoaded = false;
 		_chatsContactsAdded = false;
+		_chatMembersAdded = false;
 		_globalLoaded = false;
 		if (!_query.isEmpty() && !searchParticipantsInCache()) {
 			_timer.callOnce(AutoSearchTimeout);
@@ -825,7 +826,7 @@ bool AddSpecialBoxSearchController::loadMoreRows() {
 	if (_globalLoaded) {
 		return true;
 	}
-	if (_participantsLoaded) {
+	if (_participantsLoaded || _chatMembersAdded) {
 		if (!_chatsContactsAdded) {
 			addChatsContacts();
 		}
@@ -833,7 +834,9 @@ bool AddSpecialBoxSearchController::loadMoreRows() {
 			requestGlobal();
 		}
 	} else if (const auto chat = _peer->asChat()) {
-		addChatMembers(chat);
+		if (!_chatMembersAdded) {
+			addChatMembers(chat);
+		}
 	} else if (!isLoading()) {
 		requestParticipants();
 	}
@@ -997,6 +1000,7 @@ void AddSpecialBoxSearchController::addChatMembers(
 		return;
 	}
 
+	_chatMembersAdded = true;
 	const auto wordList = TextUtilities::PrepareSearchWords(_query);
 	if (wordList.empty()) {
 		return;
@@ -1030,7 +1034,6 @@ void AddSpecialBoxSearchController::addChatMembers(
 
 void AddSpecialBoxSearchController::addChatsContacts() {
 	_chatsContactsAdded = true;
-
 	const auto wordList = TextUtilities::PrepareSearchWords(_query);
 	if (wordList.empty()) {
 		return;

Telegram/SourceFiles/boxes/peers/add_participants_box.h

@@ -173,6 +173,7 @@ private:
 	int _offset = 0;
 	bool _participantsLoaded = false;
 	bool _chatsContactsAdded = false;
+	bool _chatMembersAdded = false;
 	bool _globalLoaded = false;
 	std::map<QString, CacheEntry> _participantsCache;
 	std::map<mtpRequestId, Query> _participantsQueries;

Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp

@@ -29,6 +29,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 namespace {
 
+// How many messages from chat history server should forward to user,
+// that was added to this chat.
+constexpr auto kForwardMessagesOnAdd = 100;
+
 constexpr auto kParticipantsFirstPageCount = 16;
 constexpr auto kParticipantsPerPage = 200;
 constexpr auto kSortByOnlineDelay = TimeMs(1000);
@@ -47,9 +51,35 @@ void RemoveAdmin(
 	)).done([=](const MTPUpdates &result) {
 		channel->session().api().applyUpdates(result);
 		channel->applyEditAdmin(user, oldRights, newRights);
-		onDone();
+		if (onDone) {
+			onDone();
+		}
 	}).fail([=](const RPCError &error) {
-		onFail();
+		if (onFail) {
+			onFail();
+		}
+	}).send();
+}
+
+void AddChatParticipant(
+		not_null<ChatData*> chat,
+		not_null<UserData*> user,
+		Fn<void()> onDone,
+		Fn<void()> onFail) {
+	chat->session().api().request(MTPmessages_AddChatUser(
+		chat->inputChat,
+		user->inputUser,
+		MTP_int(kForwardMessagesOnAdd)
+	)).done([=](const MTPUpdates &result) {
+		chat->session().api().applyUpdates(result);
+		if (onDone) {
+			onDone();
+		}
+	}).fail([=](const RPCError &error) {
+		ShowAddParticipantsError(error.type(), chat, { 1, user });
+		if (onFail) {
+			onFail();
+		}
 	}).send();
 }
 
@@ -58,16 +88,28 @@ void SaveChatAdmin(
 		not_null<UserData*> user,
 		bool isAdmin,
 		Fn<void()> onDone,
-		Fn<void()> onFail) {
+		Fn<void()> onFail,
+		bool retryOnNotParticipant = true) {
 	chat->session().api().request(MTPmessages_EditChatAdmin(
 		chat->inputChat,
 		user->inputUser,
 		MTP_bool(isAdmin)
 	)).done([=](const MTPBool &result) {
 		chat->applyEditAdmin(user, isAdmin);
-		onDone();
+		if (onDone) {
+			onDone();
+		}
 	}).fail([=](const RPCError &error) {
-		onFail();
+		const auto &type = error.type();
+		if (retryOnNotParticipant
+			&& isAdmin
+			&& (type == qstr("USER_NOT_PARTICIPANT"))) {
+			AddChatParticipant(chat, user, [=] {
+				SaveChatAdmin(chat, user, isAdmin, onDone, onFail, false);
+			}, onFail);
+		} else if (onFail) {
+			onFail();
+		}
 	}).send();
 }