Suggest group-with-hidden-members admins in mentions.

Telegram/SourceFiles/api/api_chat_participants.cpp

@@ -439,6 +439,7 @@ void ChatParticipants::requestAdmins(not_null<ChannelData*> channel) {
 		MTP_int(channel->session().serverConfig().chatSizeMax),
 		MTP_long(participantsHash)
 	)).done([=](const MTPchannels_ChannelParticipants &result) {
+		channel->mgInfo->adminsLoaded = true;
 		_adminsRequests.remove(channel);
 		result.match([&](const MTPDchannels_channelParticipants &data) {
 			channel->owner().processUsers(data.vusers());
@@ -448,6 +449,7 @@ void ChatParticipants::requestAdmins(not_null<ChannelData*> channel) {
 				"channels.channelParticipantsNotModified received!"));
 		});
 	}).fail([=] {
+		channel->mgInfo->adminsLoaded = true;
 		_adminsRequests.remove(channel);
 	}).send();
 

Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp

@@ -1505,6 +1505,11 @@ void ParticipantsBoxController::loadMoreRows() {
 			LOG(("API Error: "
 				"channels.channelParticipantsNotModified received!"));
 		});
+		if (_offset > 0 && _role == Role::Admins && channel->isMegagroup()) {
+			if (channel->mgInfo->admins.empty() && channel->mgInfo->adminsLoaded) {
+				channel->mgInfo->adminsLoaded = false;
+			}
+		}
 		if (!firstLoad && !added) {
 			_allLoaded = true;
 		}

Telegram/SourceFiles/chat_helpers/field_autocomplete.cpp

@@ -422,7 +422,9 @@ void FieldAutocomplete::updateFiltered(bool resetScroll) {
 		if (_chat) {
 			maxListSize += (_chat->participants.empty() ? _chat->lastAuthors.size() : _chat->participants.size());
 		} else if (_channel && _channel->isMegagroup()) {
-			if (!_channel->lastParticipantsRequestNeeded()) {
+			if (!_channel->canViewMembers()) {
+				maxListSize += _channel->mgInfo->admins.size();
+			} else if (!_channel->lastParticipantsRequestNeeded()) {
 				maxListSize += _channel->mgInfo->lastParticipants.size();
 			}
 		}
@@ -488,10 +490,22 @@ void FieldAutocomplete::updateFiltered(bool resetScroll) {
 				--i;
 				mrows.push_back({ i->second });
 			}
-		} else if (_channel
-			&& _channel->isMegagroup()
-			&& _channel->canViewMembers()) {
-			if (_channel->lastParticipantsRequestNeeded()) {
+		} else if (_channel && _channel->isMegagroup()) {
+			if (!_channel->canViewMembers()) {
+				if (!_channel->mgInfo->adminsLoaded) {
+					_channel->session().api().chatParticipants().requestAdmins(_channel);
+				} else {
+					mrows.reserve(mrows.size() + _channel->mgInfo->admins.size());
+					for (const auto [userId, rank] : _channel->mgInfo->admins) {
+						if (const auto user = _channel->owner().userLoaded(userId)) {
+							if (user->isInaccessible()) continue;
+							if (!listAllSuggestions && filterNotPassedByName(user)) continue;
+							if (indexOfInFirstN(mrows, user, recentInlineBots) >= 0) continue;
+							mrows.push_back({ user });
+						}
+					}
+				}
+			} else if (_channel->lastParticipantsRequestNeeded()) {
 				_channel->session().api().chatParticipants().requestLast(
 					_channel);
 			} else {

Telegram/SourceFiles/data/data_channel.h

@@ -116,6 +116,7 @@ public:
 	QString creatorRank;
 	int botStatus = 0; // -1 - no bots, 0 - unknown, 1 - one bot, that sees all history, 2 - other
 	bool joinedMessageFound = false;
+	bool adminsLoaded = false;
 	StickerSetIdentifier stickerSet;
 
 	enum LastParticipantsStatus {

Telegram/SourceFiles/history/history_widget.cpp

@@ -7495,7 +7495,7 @@ void HistoryWidget::handlePeerUpdate() {
 		if (!channel->mgInfo->botStatus) {
 			session().api().chatParticipants().requestBots(channel);
 		}
-		if (channel->mgInfo->admins.empty()) {
+		if (!channel->mgInfo->adminsLoaded) {
 			session().api().chatParticipants().requestAdmins(channel);
 		}
 	}