Allow opening monoforums.

Telegram/SourceFiles/data/data_channel.cpp

@@ -199,12 +199,18 @@ void ChannelData::setFlags(ChannelDataFlags which) {
 	// Let Data::Forum live till the end of _flags.set.
 	// That way the data can be used in changes handler.
 	// Example: render frame for forum auto-closing animation.
-	const auto taken = ((diff & Flag::Forum) && !(which & Flag::Forum))
+	const auto takenForum = ((diff & Flag::Forum) && !(which & Flag::Forum))
 		? mgInfo->takeForumData()
 		: nullptr;
+	const auto takenMonoforum = ((diff & Flag::Monoforum)
+		&& !(which & Flag::Monoforum))
+		? mgInfo->takeMonoforumData()
+		: nullptr;
 	const auto wasIn = amIn();
 	if ((diff & Flag::Forum) && (which & Flag::Forum)) {
 		mgInfo->ensureForum(this);
+	} else if ((diff & Flag::Monoforum) && (which & Flag::Monoforum)) {
+		mgInfo->ensureMonoforum(this);
 	}
 	_flags.set(which);
 	if (diff & (Flag::Left | Flag::Forbidden)) {
@@ -252,7 +258,7 @@ void ChannelData::setFlags(ChannelDataFlags which) {
 			}
 		}
 	}
-	if (const auto raw = taken.get()) {
+	if (const auto raw = takenForum.get()) {
 		owner().forumIcons().clearUserpicsReset(raw);
 	}
 }

Telegram/SourceFiles/data/data_saved_messages.cpp

@@ -74,6 +74,10 @@ rpl::producer<> SavedMessages::chatsListChanges() const {
 	return _chatsListChanges.events();
 }
 
+rpl::producer<> SavedMessages::chatsListLoadedEvents() const {
+	return _chatsListLoadedEvents.events();
+}
+
 void SavedMessages::loadMore() {
 	_loadMoreScheduled = true;
 	_loadMore.call();
@@ -104,6 +108,9 @@ void SavedMessages::sendLoadMore() {
 	).done([=](const MTPmessages_SavedDialogs &result) {
 		apply(result, false);
 		_chatsListChanges.fire({});
+		if (_chatsList.loaded()) {
+			_chatsListLoadedEvents.fire({});
+		}
 	}).fail([=](const MTP::Error &error) {
 		if (error.type() == u"SAVED_DIALOGS_UNSUPPORTED"_q) {
 			_unsupported = true;
@@ -321,6 +328,23 @@ void SavedMessages::apply(const MTPDupdateSavedDialogPinned &update) {
 	});
 }
 
+rpl::producer<> SavedMessages::destroyed() const {
+	if (!_parentChat) {
+		return rpl::never<>();
+	}
+	return _parentChat->flagsValue(
+	) | rpl::filter([=](const ChannelData::Flags::Change &update) {
+		using Flag = ChannelData::Flag;
+		return (update.diff & Flag::Monoforum)
+			&& !(update.value & Flag::Monoforum);
+	}) | rpl::take(1) | rpl::to_empty;
+}
+
+auto SavedMessages::sublistDestroyed() const
+-> rpl::producer<not_null<SavedSublist*>> {
+	return _sublistDestroyed.events();
+}
+
 rpl::lifetime &SavedMessages::lifetime() {
 	return _lifetime;
 }

Telegram/SourceFiles/data/data_saved_messages.h

@@ -35,6 +35,11 @@ public:
 	[[nodiscard]] not_null<SavedSublist*> sublist(not_null<PeerData*> peer);
 
 	[[nodiscard]] rpl::producer<> chatsListChanges() const;
+	[[nodiscard]] rpl::producer<> chatsListLoadedEvents() const;
+
+	[[nodiscard]] rpl::producer<> destroyed() const;
+	[[nodiscard]] auto sublistDestroyed() const
+		-> rpl::producer<not_null<SavedSublist*>>;
 
 	void loadMore();
 	void loadMore(not_null<SavedSublist*> sublist);
@@ -55,6 +60,8 @@ private:
 	const not_null<Session*> _owner;
 	ChannelData *_parentChat = nullptr;
 
+	rpl::event_stream<not_null<SavedSublist*>> _sublistDestroyed;
+
 	Dialogs::MainList _chatsList;
 	base::flat_map<
 		not_null<PeerData*>,
@@ -73,6 +80,7 @@ private:
 	bool _loadMoreScheduled = false;
 
 	rpl::event_stream<> _chatsListChanges;
+	rpl::event_stream<> _chatsListLoadedEvents;
 
 	bool _pinnedLoaded = false;
 	bool _unsupported = false;

Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp

@@ -781,6 +781,47 @@ void InnerWidget::changeOpenedForum(Data::Forum *forum) {
 	}
 }
 
+void InnerWidget::changeOpenedMonoforum(Data::SavedMessages *monoforum) {
+	if (_savedSublists == monoforum) {
+		return;
+	}
+	stopReorderPinned();
+	clearSelection();
+
+	if (monoforum) {
+		saveChatsFilterScrollState(_filterId);
+	}
+	_filterId = monoforum
+		? 0
+		: _controller->activeChatsFilterCurrent();
+	if (_openedForum) {
+		// If we close it inside forum destruction we should not schedule.
+		session().data().forumIcons().scheduleUserpicsReset(_openedForum);
+	}
+	_savedSublists = monoforum;
+	_st = &st::defaultDialogRow;
+	refreshShownList();
+
+	_openedForumLifetime.destroy();
+	if (monoforum) {
+		rpl::merge(
+			monoforum->chatsListChanges(),
+			monoforum->chatsListLoadedEvents()
+		) | rpl::start_with_next([=] {
+			refresh();
+		}, _openedForumLifetime);
+	}
+
+	refreshWithCollapsedRows(true);
+	if (_loadMoreCallback) {
+		_loadMoreCallback();
+	}
+
+	if (!monoforum) {
+		restoreChatsFilterScrollState(_filterId);
+	}
+}
+
 void InnerWidget::showSavedSublists(ChannelData *parentChat) {
 	Expects(!parentChat || parentChat->monoforum());
 	Expects(!_geometryInited);

Telegram/SourceFiles/dialogs/dialogs_inner_widget.h

@@ -141,6 +141,7 @@ public:
 
 	void changeOpenedFolder(Data::Folder *folder);
 	void changeOpenedForum(Data::Forum *forum);
+	void changeOpenedMonoforum(Data::SavedMessages *monoforum);
 	void showSavedSublists(ChannelData *parentChat);
 	void selectSkip(int32 direction);
 	void selectSkipPage(int32 pixels, int32 direction);

Telegram/SourceFiles/dialogs/dialogs_main_list.cpp

@@ -28,7 +28,7 @@ MainList::MainList(
 	std::move(
 		pinnedLimit
 	) | rpl::start_with_next([=](int limit) {
-		_pinned.setLimit(limit);
+		_pinned.setLimit(std::max(limit, 1));
 	}, _lifetime);
 
 	session->changes().realtimeNameUpdates(

Telegram/SourceFiles/dialogs/dialogs_widget.cpp

@@ -25,6 +25,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_contact_status.h"
 #include "history/view/history_view_requests_bar.h"
 #include "history/view/history_view_group_call_bar.h"
+#include "history/view/history_view_sublist_section.h"
 #include "boxes/peers/edit_peer_requests_box.h"
 #include "ui/text/text_utilities.h"
 #include "ui/widgets/buttons.h"
@@ -78,6 +79,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_changes.h"
 #include "data/data_download_manager.h"
 #include "data/data_chat_filters.h"
+#include "data/data_saved_messages.h"
 #include "data/data_saved_sublist.h"
 #include "data/data_stories.h"
 #include "info/downloads/info_downloads_widget.h"
@@ -418,6 +420,8 @@ Widget::Widget(
 	) | rpl::filter([=](const Data::HistoryUpdate &update) {
 		if (_openedForum) {
 			return (update.history == _openedForum->history());
+		} else if (_openedMonoforum) {
+			return (update.history->peer == _openedMonoforum->parentChat());
 		} else if (_openedFolder) {
 			return (update.history->folder() == _openedFolder)
 				&& !update.history->isPinnedDialog(FilterId());
@@ -596,6 +600,7 @@ Widget::Widget(
 		_search->setFocusFast();
 		if (_childList) {
 			controller->closeForum();
+			controller->closeMonoforum();
 		}
 	});
 
@@ -618,6 +623,8 @@ Widget::Widget(
 			searchMore();
 		} else if (_openedForum && state == WidgetState::Default) {
 			_openedForum->requestTopics();
+		} else if (_openedMonoforum && state == WidgetState::Default) {
+			_openedMonoforum->loadMore();
 		} else {
 			const auto folder = _inner->shownFolder();
 			if (!folder || !folder->chatsList()->loaded()) {
@@ -666,7 +673,16 @@ Widget::Widget(
 		) | rpl::filter(!rpl::mappers::_1) | rpl::start_with_next([=] {
 			if (_openedForum) {
 				changeOpenedForum(nullptr, anim::type::normal);
-			} else if (_childList) {
+			} else if (_childList && !_childList->openedMonoforum()) {
+				closeChildList(anim::type::normal);
+			}
+		}, lifetime());
+
+		controller->shownMonoforum().changes(
+		) | rpl::filter(!rpl::mappers::_1) | rpl::start_with_next([=] {
+			if (_openedMonoforum) {
+				changeOpenedMonoforum(nullptr, anim::type::normal);
+			} else if (_childList && !_childList->openedForum()) {
 				closeChildList(anim::type::normal);
 			}
 		}, lifetime());
@@ -795,7 +811,7 @@ void Widget::setupSwipeBack() {
 				}
 			});
 		}
-		if (controller()->shownForum().current()) {
+		if (controller()->shownForum().current()) { // #TODO monoforum
 			if (!isRightToLeft) {
 				return Ui::Controls::SwipeHandlerFinishData();
 			}
@@ -924,6 +940,26 @@ void Widget::chosenRow(const ChosenRow &row) {
 			}
 		}
 		return;
+	} else if (history
+		&& history->isMonoforum()
+		&& !row.message.fullId
+		&& !controller()->adaptive().isOneColumn()) {
+		const auto monoforum = history->peer->monoforum();
+		if (controller()->shownMonoforum().current() == monoforum) {
+			controller()->closeMonoforum();
+		//} else if (row.newWindow) { // #TODO monoforum
+		//	controller()->showInNewWindow(
+		//		Window::SeparateId(Window::SeparateType::Forum, history));
+		} else {
+			controller()->showMonoforum(
+				monoforum,
+				Window::SectionShow().withChildColumn());
+			controller()->showThread(
+				history,
+				ShowAtUnreadMsgId,
+				Window::SectionShow::Way::ClearStack);
+		}
+		return;
 	} else if (history) {
 		const auto peer = history->peer;
 		const auto showAtMsgId = controller()->uniqueChatsInSearchResults()
@@ -958,6 +994,13 @@ void Widget::chosenRow(const ChosenRow &row) {
 		}
 		controller()->openFolder(folder);
 		hideChildList();
+	} else if (const auto sublist = row.key.sublist()) {
+		using namespace Window;
+		auto params = SectionShow(SectionShow::Way::Forward);
+		params.dropSameFromStack = true;
+		controller()->showSection(
+			std::make_shared<HistoryView::SublistMemento>(sublist),
+			params);
 	}
 	if (row.filteredRow && !session().supportMode()) {
 		if (_subsectionTopBar) {
@@ -1032,7 +1075,8 @@ void Widget::setupTopBarSuggestions(not_null<Ui::VerticalLayout*> dialogs) {
 		) | rpl::filter(_1 == nullptr) | rpl::map([=] {
 			auto on = rpl::combine(
 				controller()->activeChatsFilter(),
-				_openedFolderOrForumChanges.events_starting_with(false),
+				_openedFolderOrForumOrMonoforumChanges.events_starting_with(
+					false),
 				widthValue() | rpl::map(
 					_1 >= st::columnMinimalWidthLeft
 				) | rpl::distinct_until_changed(),
@@ -1041,11 +1085,11 @@ void Widget::setupTopBarSuggestions(not_null<Ui::VerticalLayout*> dialogs) {
 				_jumpToDate->toggledValue()
 			) | rpl::map([=](
 					FilterId id,
-					bool folderOrForum,
+					bool folderOrForumOrMonoforum,
 					bool wide,
 					bool search,
 					bool searchInPeer) {
-				return !folderOrForum
+				return !folderOrForumOrMonoforum
 					&& wide
 					&& !search
 					&& !searchInPeer
@@ -1102,7 +1146,8 @@ void Widget::updateFrozenAccountBar() {
 
 void Widget::updateTopBarSuggestions() {
 	if (_topBarSuggestion) {
-		_openedFolderOrForumChanges.fire(_openedForum || _openedFolder);
+		_openedFolderOrForumOrMonoforumChanges.fire(
+			_openedFolder || _openedForum || _openedMonoforum);
 	}
 }
 
@@ -1540,7 +1585,7 @@ void Widget::updateControlsVisibility(bool fast) {
 	if (_chatFilters) {
 		_chatFilters->setVisible(!_openedForum);
 	}
-	if (_openedFolder || _openedForum) {
+	if (_openedFolder || _openedForum || _openedMonoforum) {
 		_subsectionTopBar->show();
 		if (_forumTopShadow) {
 			_forumTopShadow->show();
@@ -1919,6 +1964,29 @@ void Widget::changeOpenedForum(Data::Forum *forum, anim::type animated) {
 	}, (forum != nullptr), animated);
 }
 
+void Widget::changeOpenedMonoforum(
+		Data::SavedMessages *monoforum,
+		anim::type animated) {
+	if (_openedMonoforum == monoforum) {
+		return;
+	}
+	changeOpenedSubsection([&] {
+		cancelSearch({ .forceFullCancel = true });
+		closeChildList(anim::type::instant);
+		_openedMonoforum = monoforum;
+		_searchState.tab = monoforum
+			? ChatSearchTab::ThisPeer
+			: ChatSearchTab::MyMessages;
+		_searchWithPostsPreview = computeSearchWithPostsPreview();
+		_api.request(base::take(_topicSearchRequest)).cancel();
+		_inner->changeOpenedMonoforum(monoforum);
+		storiesToggleExplicitExpand(false);
+		updateFrozenAccountBar();
+		updateTopBarSuggestions();
+		updateStoriesVisibility();
+	}, (monoforum != nullptr), animated);
+}
+
 void Widget::hideChildList() {
 	if (_childList) {
 		controller()->closeForum();
@@ -1926,7 +1994,7 @@ void Widget::hideChildList() {
 }
 
 void Widget::refreshTopBars() {
-	if (_openedFolder || _openedForum) {
+	if (_openedFolder || _openedForum || _openedMonoforum) {
 		if (!_subsectionTopBar) {
 			_subsectionTopBar.create(this, controller());
 			if (_stories) {
@@ -1956,10 +2024,12 @@ void Widget::refreshTopBars() {
 		}
 		const auto history = _openedForum
 			? _openedForum->history().get()
+			: _openedMonoforum
+			? session().data().history(_openedMonoforum->parentChat()).get()
 			: nullptr;
 		_subsectionTopBar->setActiveChat(
 			HistoryView::TopBarWidget::ActiveChat{
-				.key = (_openedForum
+				.key = ((_openedForum || _openedMonoforum)
 					? Dialogs::Key(history)
 					: Dialogs::Key(_openedFolder)),
 				.section = Dialogs::EntryState::Section::ChatsList,
@@ -2121,6 +2191,14 @@ bool Widget::searchHasFocus() const {
 	return _searchHasFocus;
 }
 
+Data::Forum *Widget::openedForum() const {
+	return _openedForum;
+}
+
+Data::SavedMessages *Widget::openedMonoforum() const {
+	return _openedMonoforum;
+}
+
 void Widget::jumpToTop(bool belowPinned) {
 	if (session().supportMode()) {
 		return;
@@ -3283,12 +3361,33 @@ void Widget::showForum(
 		return;
 	}
 	cancelSearch({ .forceFullCancel = true });
-	openChildList(forum, params);
+	openChildList(forum, nullptr, params);
+}
+
+void Widget::showMonoforum(
+		not_null<Data::SavedMessages*> monoforum,
+		const Window::SectionShow &params) {
+	if (_openedMonoforum == monoforum) {
+		return;
+	}
+	const auto nochat = !controller()->mainSectionShown();
+	if (!params.childColumn
+		|| (Core::App().settings().dialogsWidthRatio(nochat) == 0.)
+		|| (_layout != Layout::Main)
+		|| OptionForumHideChatsList.value()) {
+		changeOpenedMonoforum(monoforum, params.animated);
+		return;
+	}
+	cancelSearch({ .forceFullCancel = true });
+	openChildList(nullptr, monoforum, params);
 }
 
 void Widget::openChildList(
-		not_null<Data::Forum*> forum,
+		Data::Forum *forum,
+		Data::SavedMessages *monoforum,
 		const Window::SectionShow &params) {
+	Expects(forum || monoforum);
+
 	auto slide = Window::SectionSlideParams();
 	const auto animated = !_childList
 		&& (params.animated == anim::type::normal);
@@ -3309,8 +3408,13 @@ void Widget::openChildList(
 			this,
 			controller(),
 			Layout::Child);
-		_childList->showForum(forum, copy);
+		if (forum) {
-		_childListPeerId = forum->channel()->id;
+			_childList->showForum(forum, copy);
+			_childListPeerId = forum->channel()->id;
+		} else {
+			_childList->showMonoforum(monoforum, copy);
+			_childListPeerId = monoforum->parentChat()->id;
+		}
 	}
 
 	_childListShadow = std::make_unique<Ui::RpWidget>(this);

Telegram/SourceFiles/dialogs/dialogs_widget.h

@@ -23,6 +23,7 @@ class Error;
 
 namespace Data {
 class Forum;
+class SavedMessages;
 enum class StorySourcesList : uchar;
 struct ReactionId;
 } // namespace Data
@@ -108,9 +109,15 @@ public:
 	void showForum(
 		not_null<Data::Forum*> forum,
 		const Window::SectionShow &params);
+	void showMonoforum(
+		not_null<Data::SavedMessages*> monoforum,
+		const Window::SectionShow &params);
 	void setInnerFocus(bool unfocusSearch = false);
 	[[nodiscard]] bool searchHasFocus() const;
 
+	[[nodiscard]] Data::Forum *openedForum() const;
+	[[nodiscard]] Data::SavedMessages *openedMonoforum() const;
+
 	void jumpToTop(bool belowPinned = false);
 	void raiseWithTooltip();
 
@@ -247,6 +254,9 @@ private:
 		anim::type animated);
 	void changeOpenedFolder(Data::Folder *folder, anim::type animated);
 	void changeOpenedForum(Data::Forum *forum, anim::type animated);
+	void changeOpenedMonoforum(
+		Data::SavedMessages *monoforum,
+		anim::type animated);
 	void hideChildList();
 	void destroyChildListCanvas();
 	[[nodiscard]] QPixmap grabForFolderSlideAnimation();
@@ -256,7 +266,8 @@ private:
 		Window::SlideDirection direction);
 
 	void openChildList(
-		not_null<Data::Forum*> forum,
+		Data::Forum *forum,
+		Data::SavedMessages *monoforum,
 		const Window::SectionShow &params);
 	void closeChildList(anim::type animated);
 
@@ -332,7 +343,7 @@ private:
 	Ui::SlideWrap<Ui::RpWidget> *_topBarSuggestion = nullptr;
 	rpl::event_stream<int> _topBarSuggestionHeightChanged;
 	rpl::event_stream<bool> _searchStateForTopBarSuggestion;
-	rpl::event_stream<bool> _openedFolderOrForumChanges;
+	rpl::event_stream<bool> _openedFolderOrForumOrMonoforumChanges;
 
 	object_ptr<Ui::ElasticScroll> _scroll;
 	QPointer<InnerWidget> _inner;
@@ -358,6 +369,7 @@ private:
 
 	Data::Folder *_openedFolder = nullptr;
 	Data::Forum *_openedForum = nullptr;
+	Data::SavedMessages *_openedMonoforum = nullptr;
 	SearchState _searchState;
 	History *_searchInMigrated = nullptr;
 	rpl::lifetime _searchTagsLifetime;

Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp

@@ -762,6 +762,10 @@ void TopBarWidget::backClicked() {
 		&& _activeChat.key.history()
 		&& _activeChat.key.history()->isForum()) {
 		_controller->closeForum();
+	} else if (_activeChat.section == Section::ChatsList
+		&& _activeChat.key.history()
+		&& _activeChat.key.history()->isMonoforum()) {
+		_controller->closeMonoforum();
 	} else {
 		_controller->showBackFromStack();
 	}

Telegram/SourceFiles/info/profile/info_profile_actions.cpp

@@ -2183,6 +2183,23 @@ Ui::MultiSlideTracker DetailsFiller::fillChannelButtons(
 		std::move(viewChannel),
 		tracker);
 
+	auto viewDirectVisible = channel->flagsValue() | rpl::map([=] {
+		return channel->monoforumLink() != nullptr;
+	}) | rpl::distinct_until_changed();
+	auto viewDirect = [=] {
+		if (const auto linked = channel->monoforumLink()) {
+			if (const auto monoforum = linked->monoforum()) {
+				window->showMonoforum(monoforum);
+			}
+		}
+	};
+	AddMainButton( // #TODO monoforum
+		_wrap,
+		rpl::single(u"View Direct Messages"_q),
+		std::move(viewDirectVisible),
+		std::move(viewDirect),
+		tracker);
+
 	return tracker;
 }
 

Telegram/SourceFiles/mainwidget.cpp

@@ -1565,6 +1565,18 @@ void MainWidget::showForum(
 	}
 }
 
+void MainWidget::showMonoforum(
+		not_null<Data::SavedMessages*> monoforum,
+		const SectionShow &params) {
+	Expects(_dialogs != nullptr);
+
+	_dialogs->showMonoforum(monoforum, params);
+
+	if (params.activation != anim::activation::background) {
+		_controller->window().hideSettingsAndLayer();
+	}
+}
+
 PeerData *MainWidget::peer() const {
 	return _history->peer();
 }

Telegram/SourceFiles/mainwidget.h

@@ -32,6 +32,7 @@ class Thread;
 class WallPaper;
 struct ForwardDraft;
 class Forum;
+class SavedMessages;
 struct ReportInput;
 } // namespace Data
 
@@ -198,6 +199,9 @@ public:
 		not_null<const HistoryItem*> item,
 		const SectionShow &params);
 	void showForum(not_null<Data::Forum*> forum, const SectionShow &params);
+	void showMonoforum(
+		not_null<Data::SavedMessages*> monoforum,
+		const SectionShow &params);
 
 	bool notify_switchInlineBotButtonReceived(const QString &query, UserData *samePeerBot, MsgId samePeerReplyTo);
 

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -603,10 +603,15 @@ void SessionNavigation::showPeerByLinkResolved(
 		showPeerInfo(peer, params);
 	} else if (resolveType == ResolveType::HashtagSearch) {
 		searchMessages(info.text, peer->owner().history(peer));
-	} else if (peer->isForum() && resolveType != ResolveType::Boost) {
+	} else if ((peer->isForum() || peer->isMonoforum())
+			&& resolveType != ResolveType::Boost) {
 		const auto itemId = info.messageId;
 		if (!itemId) {
-			parentController()->showForum(peer->forum(), params);
+			if (peer->isForum()) {
+				parentController()->showForum(peer->forum(), params);
+			} else {
+				parentController()->showMonoforum(peer->monoforum(), params);
+			}
 		} else if (const auto item = peer->owner().message(peer, itemId)) {
 			showMessageByLinkResolved(item, info);
 		} else {
@@ -1924,6 +1929,56 @@ const rpl::variable<Data::Forum*> &SessionController::shownForum() const {
 	return _shownForum;
 }
 
+void SessionController::showMonoforum(
+		not_null<Data::SavedMessages*> monoforum,
+		const SectionShow &params) {
+	// if (showForumInDifferentWindow(forum, params)) {
+	// 	return;
+	// }
+	_shownMonoforumLifetime.destroy();
+	if (_shownMonoforum.current() != monoforum) {
+		resetFakeUnreadWhileOpened();
+	}
+	if (monoforum
+		&& _activeChatEntry.current().key.peer()
+		&& adaptive().isOneColumn()) {
+		clearSectionStack(params);
+	}
+	_shownMonoforum = monoforum.get();
+	if (_shownMonoforum.current() != monoforum) {
+		return;
+	}
+	monoforum->destroyed(
+	) | rpl::start_with_next([=] {
+		closeMonoforum();
+	}, _shownMonoforumLifetime);
+	content()->showMonoforum(monoforum, params);
+}
+
+void SessionController::closeMonoforum() {
+	if (const auto monoforum = _shownMonoforum.current()) {
+		const auto id = windowId();
+		if (id.type == SeparateType::SavedSublist) {
+			const auto initial = id.parentChat;
+			if (!initial
+				|| !initial->monoforum()
+				|| initial == monoforum->parentChat()) {
+				Core::App().closeWindow(_window);
+			} else {
+				showMonoforum(initial->monoforum());
+			}
+			return;
+		}
+	}
+	_shownMonoforumLifetime.destroy();
+	_shownMonoforum = nullptr;
+}
+
+auto SessionController::shownMonoforum() const
+-> const rpl::variable<Data::SavedMessages*> & {
+	return _shownMonoforum;
+}
+
 void SessionController::setActiveChatEntry(Dialogs::RowDescriptor row) {
 	if (windowId().type == SeparateType::SharedMedia) {
 		return;

Telegram/SourceFiles/window/window_session_controller.h

@@ -26,6 +26,7 @@ enum class WindowLayout;
 
 namespace Data {
 struct StoriesContext;
+class SavedMessages;
 enum class StorySourcesList : uchar;
 } // namespace Data
 
@@ -405,6 +406,12 @@ public:
 	void closeForum();
 	const rpl::variable<Data::Forum*> &shownForum() const;
 
+	void showMonoforum(
+		not_null<Data::SavedMessages*> monoforum,
+		const SectionShow &params = SectionShow::Way::ClearStack);
+	void closeMonoforum();
+	const rpl::variable<Data::SavedMessages*> &shownMonoforum() const;
+
 	void setActiveChatEntry(Dialogs::RowDescriptor row);
 	void setActiveChatEntry(Dialogs::Key key);
 	Dialogs::RowDescriptor activeChatEntryCurrent() const;
@@ -746,6 +753,8 @@ private:
 	rpl::variable<Data::Folder*> _openedFolder;
 	rpl::variable<Data::Forum*> _shownForum;
 	rpl::lifetime _shownForumLifetime;
+	rpl::variable<Data::SavedMessages*> _shownMonoforum;
+	rpl::lifetime _shownMonoforumLifetime;
 
 	rpl::event_stream<> _filtersMenuChanged;