Support cloud view_as_messages forum setting.

Telegram/Resources/langs/lang.strings

@@ -4170,6 +4170,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_forum_create_topic" = "Create topic";
 "lng_forum_discard_sure" = "Are you sure you want to discard this topic?";
 "lng_forum_view_as_messages" = "View as Messages";
+"lng_forum_view_as_topics" = "View as Topics";
 "lng_forum_no_messages" = "No messages";
 "lng_forum_messages#one" = "{count} message";
 "lng_forum_messages#other" = "{count} messages";

Telegram/SourceFiles/api/api_updates.cpp

@@ -2326,6 +2326,14 @@ void Updates::feedUpdate(const MTPUpdate &update) {
 		}
 	} break;
 
+	case mtpc_updateChannelViewForumAsMessages: {
+		const auto &d = update.c_updateChannelViewForumAsMessages();
+		const auto id = ChannelId(d.vchannel_id());
+		if (const auto channel = session().data().channelLoaded(id)) {
+			channel->setViewAsMessagesFlag(mtpIsTrue(d.venabled()));
+		}
+	} break;
+
 	// Pinned message.
 	case mtpc_updatePinnedMessages: {
 		const auto &d = update.c_updatePinnedMessages();

Telegram/SourceFiles/data/data_channel.cpp

@@ -475,6 +475,14 @@ void ChannelData::applyEditBanned(
 	session().changes().peerUpdated(this, flags);
 }
 
+void ChannelData::setViewAsMessagesFlag(bool enabled) {
+	if (viewForumAsMessages() == enabled) {
+		return;
+	}
+	setFlags((flags() & ~Flag::ViewAsMessages)
+		| (enabled ? Flag::ViewAsMessages : Flag()));
+}
+
 void ChannelData::markForbidden() {
 	owner().processChat(MTP_channelForbidden(
 		MTP_flags(isMegagroup()
@@ -998,7 +1006,8 @@ void ApplyChannelUpdate(
 		| Flag::AntiSpam
 		| Flag::Location
 		| Flag::ParticipantsHidden
-		| Flag::CanGetStatistics;
+		| Flag::CanGetStatistics
+		| Flag::ViewAsMessages;
 	channel->setFlags((channel->flags() & ~mask)
 		| (update.is_can_set_username() ? Flag::CanSetUsername : Flag())
 		| (update.is_can_view_participants()
@@ -1011,7 +1020,10 @@ void ApplyChannelUpdate(
 		| (update.is_participants_hidden()
 			? Flag::ParticipantsHidden
 			: Flag())
-		| (update.is_can_view_stats() ? Flag::CanGetStatistics : Flag()));
+		| (update.is_can_view_stats() ? Flag::CanGetStatistics : Flag())
+		| (update.is_view_forum_as_messages()
+			? Flag::ViewAsMessages
+			: Flag()));
 	channel->setUserpicPhoto(update.vchat_photo());
 	if (const auto migratedFrom = update.vmigrated_from_chat_id()) {
 		channel->addFlags(Flag::Megagroup);

Telegram/SourceFiles/data/data_channel.h

@@ -63,6 +63,7 @@ enum class ChannelDataFlag {
 	HasActiveStories = (1 << 27),
 	HasUnreadStories = (1 << 28),
 	CanGetStatistics = (1 << 29),
+	ViewAsMessages = (1 << 30),
 };
 inline constexpr bool is_flag_type(ChannelDataFlag) { return true; };
 using ChannelDataFlags = base::flags<ChannelDataFlag>;
@@ -233,6 +234,9 @@ public:
 	[[nodiscard]] bool hasStoriesHidden() const {
 		return flags() & Flag::StoriesHidden;
 	}
+	[[nodiscard]] bool viewForumAsMessages() const {
+		return flags() & Flag::ViewAsMessages;
+	}
 
 	[[nodiscard]] static ChatRestrictionsInfo KickedRestrictedRights(
 		not_null<PeerData*> participant);
@@ -249,6 +253,7 @@ public:
 		not_null<PeerData*> participant,
 		ChatRestrictionsInfo oldRights,
 		ChatRestrictionsInfo newRights);
+	void setViewAsMessagesFlag(bool enabled);
 
 	void markForbidden();
 

Telegram/SourceFiles/data/data_session.cpp

@@ -4545,6 +4545,25 @@ void Session::applyStatsDcId(
 	}
 }
 
+void Session::saveViewAsMessages(
+		not_null<Forum*> forum,
+		bool viewAsMessages) {
+	const auto channel = forum->channel();
+	if (const auto requestId = _viewAsMessagesRequests.take(channel)) {
+		_session->api().request(*requestId).cancel();
+	}
+	_viewAsMessagesRequests[channel] = _session->api().request(
+		MTPchannels_ToggleViewForumAsMessages(
+			channel->inputChannel,
+			MTP_bool(viewAsMessages))
+	).done([=] {
+		_viewAsMessagesRequests.remove(channel);
+	}).fail([=] {
+		_viewAsMessagesRequests.remove(channel);
+	}).send();
+	channel->setViewAsMessagesFlag(viewAsMessages);
+}
+
 void Session::webViewResultSent(WebViewResultSent &&sent) {
 	return _webViewResultSent.fire(std::move(sent));
 }

Telegram/SourceFiles/data/data_session.h

@@ -727,6 +727,8 @@ public:
 	void webViewResultSent(WebViewResultSent &&sent);
 	[[nodiscard]] rpl::producer<WebViewResultSent> webViewResultSent() const;
 
+	void saveViewAsMessages(not_null<Forum*> forum, bool viewAsMessages);
+
 	[[nodiscard]] auto peerDecorationsUpdated() const
 		-> rpl::producer<not_null<PeerData*>>;
 
@@ -1022,6 +1024,9 @@ private:
 	rpl::event_stream<WebViewResultSent> _webViewResultSent;
 
 	rpl::event_stream<not_null<PeerData*>> _peerDecorationsUpdated;
+	base::flat_map<
+		not_null<ChannelData*>,
+		mtpRequestId> _viewAsMessagesRequests;
 
 	Groups _groups;
 	const std::unique_ptr<ChatFilters> _chatsFilters;

Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp

@@ -1251,7 +1251,8 @@ void InnerWidget::selectByMouse(QPoint globalPosition) {
 		const auto selectedTopicJump = selected
 			&& selected->lookupIsInTopicJump(
 				local.x(),
-				mouseY - offset - selected->top());
+				mouseY - offset - selected->top())
+			&& _controller->adaptive().isOneColumn();
 		if (_collapsedSelected != collapsedSelected
 			|| _selected != selected
 			|| _selectedTopicJump != selectedTopicJump) {
@@ -1293,7 +1294,8 @@ void InnerWidget::selectByMouse(QPoint globalPosition) {
 			const auto selectedTopicJump = (filteredSelected >= 0)
 				&& _filterResults[filteredSelected].row->lookupIsInTopicJump(
 					local.x(),
-					mouseY - skip - _filterResults[filteredSelected].top);
+					mouseY - skip - _filterResults[filteredSelected].top)
+				&& _controller->adaptive().isOneColumn();
 			if (_filteredSelected != filteredSelected
 				|| _selectedTopicJump != selectedTopicJump) {
 				updateSelectedRow();

Telegram/SourceFiles/dialogs/dialogs_widget.cpp

@@ -520,18 +520,37 @@ void Widget::chosenRow(const ChosenRow &row) {
 		}
 		return;
 	} else if (const auto topic = row.key.topic()) {
+		session().data().saveViewAsMessages(topic->forum(), false);
 		controller()->showThread(
 			topic,
 			row.message.fullId.msg,
 			Window::SectionShow::Way::ClearStack);
-	} else if (history && history->isForum() && !row.message.fullId) {
+	} else if (history
+		&& history->isForum()
+		&& !row.message.fullId
+		&& (!controller()->adaptive().isOneColumn()
+			|| !history->peer->forum()->channel()->viewForumAsMessages())) {
 		const auto forum = history->peer->forum();
 		if (controller()->shownForum().current() == forum) {
 			controller()->closeForum();
-		} else {
-			controller()->showForum(
-				forum,
-				Window::SectionShow().withChildColumn());
+			return;
+		}
+		controller()->showForum(
+			forum,
+			Window::SectionShow().withChildColumn());
+		if (forum->channel()->viewForumAsMessages()) {
+			controller()->showThread(
+				history,
+				ShowAtUnreadMsgId,
+				Window::SectionShow::Way::ClearStack);
+		} else if (!controller()->adaptive().isOneColumn()) {
+			const auto item = history->chatListMessage();
+			if (const auto topic = item ? item->topic() : nullptr) {
+				controller()->showThread(
+					topic,
+					ShowAtUnreadMsgId,
+					Window::SectionShow::Way::ClearStack);
+			}
 		}
 		return;
 	} else if (history) {

Telegram/SourceFiles/history/history.cpp

@@ -2808,6 +2808,7 @@ void History::applyDialog(
 				}
 			}
 		}
+		channel->setViewAsMessagesFlag(data.is_view_forum_as_messages());
 	}
 	owner().notifySettings().apply(
 		MTP_notifyPeer(data.vpeer()),

Telegram/SourceFiles/window/window_peer_menu.cpp

@@ -281,6 +281,7 @@ private:
 	void addGiftPremium();
 	void addCreateTopic();
 	void addViewAsMessages();
+	void addViewAsTopics();
 	void addSearchTopics();
 	void addDeleteTopic();
 	void addVideoChat();
@@ -1147,10 +1148,29 @@ void Filler::addViewAsMessages() {
 	const auto peer = _peer;
 	const auto controller = _controller;
 	_addAction(tr::lng_forum_view_as_messages(tr::now), [=] {
+		if (const auto forum = peer->forum()) {
+			peer->owner().saveViewAsMessages(forum, true);
+		}
 		controller->showPeerHistory(peer->id);
 	}, &st::menuIconViewReplies);
 }
 
+void Filler::addViewAsTopics() {
+	if (!_peer
+		|| !_peer->isForum()
+		|| !_controller->adaptive().isOneColumn()) {
+		return;
+	}
+	const auto peer = _peer;
+	const auto controller = _controller;
+	_addAction(tr::lng_forum_view_as_topics(tr::now), [=] {
+		if (const auto forum = peer->forum()) {
+			peer->owner().saveViewAsMessages(forum, false);
+			controller->showForum(forum);
+		}
+	}, &st::menuIconViewReplies);
+}
+
 void Filler::addSearchTopics() {
 	const auto forum = _peer ? _peer->forum() : nullptr;
 	if (!forum) {
@@ -1235,6 +1255,7 @@ void Filler::fillContextMenuActions() {
 void Filler::fillHistoryActions() {
 	addToggleMuteSubmenu(true);
 	addInfo();
+	addViewAsTopics();
 	addStoryArchive();
 	addSupportInfo();
 	addManageChat();