Start new tabs for monoforums.

Telegram/CMakeLists.txt

@@ -888,6 +888,8 @@ PRIVATE
     history/view/history_view_sponsored_click_handler.h
     history/view/history_view_sticker_toast.cpp
     history/view/history_view_sticker_toast.h
+    history/view/history_view_subsection_tabs.cpp
+    history/view/history_view_subsection_tabs.h
     history/view/history_view_text_helper.cpp
     history/view/history_view_text_helper.h
     history/view/history_view_transcribe_button.cpp

Telegram/SourceFiles/chat_helpers/ttl_media_layer_widget.cpp

@@ -52,7 +52,7 @@ public:
 	bool elementAnimationsPaused() override;
 	not_null<Ui::PathShiftGradient*> elementPathShiftGradient() override;
 	HistoryView::Context elementContext() override;
-	bool elementIsChatWide() override;
+	HistoryView::ElementChatMode elementChatMode() override;
 
 private:
 	const not_null<QWidget*> _parent;
@@ -83,8 +83,9 @@ HistoryView::Context PreviewDelegate::elementContext() {
 	return HistoryView::Context::TTLViewer;
 }
 
-bool PreviewDelegate::elementIsChatWide() {
-	return _chatWide.current();
+HistoryView::ElementChatMode PreviewDelegate::elementChatMode() {
+	using Mode = HistoryView::ElementChatMode;
+	return _chatWide.current() ? Mode::Wide : Mode::Default;
 }
 
 class PreviewWrap final : public Ui::RpWidget {

Telegram/SourceFiles/dialogs/dialogs_widget.cpp

@@ -940,27 +940,27 @@ void Widget::chosenRow(const ChosenRow &row) {
 			}
 		}
 		return;
-	} else if (history
-		&& history->peer->amMonoforumAdmin()
-		&& !row.message.fullId) {
-		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());
-			if (!controller()->adaptive().isOneColumn()) {
-				controller()->showThread(
-					history,
-					ShowAtUnreadMsgId,
-					Window::SectionShow::Way::ClearStack);
-			}
-		}
-		return;
+	//} else if (history
+	//	&& history->peer->amMonoforumAdmin()
+	//	&& !row.message.fullId) {
+	//	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());
+	//		if (!controller()->adaptive().isOneColumn()) {
+	//			controller()->showThread(
+	//				history,
+	//				ShowAtUnreadMsgId,
+	//				Window::SectionShow::Way::ClearStack);
+	//		}
+	//	}
+	//	return;
 	} else if (history) {
 		const auto peer = history->peer;
 		const auto showAtMsgId = controller()->uniqueChatsInSearchResults()
@@ -999,13 +999,17 @@ void Widget::chosenRow(const ChosenRow &row) {
 		using namespace Window;
 		auto params = SectionShow(SectionShow::Way::Forward);
 		params.dropSameFromStack = true;
-		using namespace HistoryView;
-		controller()->showSection(
-			std::make_shared<ChatMemento>(ChatViewId{
-				.history = sublist->owningHistory(),
-				.sublist = sublist,
-			}),
-			params);
+		params.highlightPart.text = _searchState.query;
+		if (!params.highlightPart.empty()) {
+			params.highlightPartOffsetHint = kSearchQueryOffsetHint;
+		}
+		if (false && row.newWindow) { // #TODO monoforum
+			controller()->showInNewWindow(
+				Window::SeparateId(sublist),
+				row.message.fullId.msg);
+		} else {
+			controller()->showThread(sublist, row.message.fullId.msg, params);
+		}
 	}
 	if (row.filteredRow && !session().supportMode()) {
 		if (_subsectionTopBar) {

Telegram/SourceFiles/dialogs/ui/dialogs_topics_view.cpp

@@ -152,7 +152,7 @@ void TopicsView::prepare(PeerId frontPeerId, Fn<void()> customEmojiRepaint) {
 			Ui::Text::SingleCustomEmoji(
 				manager->peerUserpicEmojiData(peer),
 				u"@"_q)
-		).append(peer->shortName());
+		).append(' ').append(peer->shortName());
 		title.key = key;
 		title.version = peer->nameVersion();
 		title.unread = unread;

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp

@@ -740,8 +740,9 @@ void InnerWidget::elementSearchInList(
 void InnerWidget::elementHandleViaClick(not_null<UserData*> bot) {
 }
 
-bool InnerWidget::elementIsChatWide() {
-	return _isChatWide;
+HistoryView::ElementChatMode InnerWidget::elementChatMode() {
+	using Mode = HistoryView::ElementChatMode;
+	return _isChatWide ? Mode::Wide : Mode::Default;
 }
 
 not_null<Ui::PathShiftGradient*> InnerWidget::elementPathShiftGradient() {

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.h

@@ -131,7 +131,7 @@ public:
 		const QString &query,
 		const FullMsgId &context) override;
 	void elementHandleViaClick(not_null<UserData*> bot) override;
-	bool elementIsChatWide() override;
+	HistoryView::ElementChatMode elementChatMode() override;
 	not_null<Ui::PathShiftGradient*> elementPathShiftGradient() override;
 	void elementReplyTo(const FullReplyTo &to) override;
 	void elementStartInteraction(

Telegram/SourceFiles/history/history_inner_widget.cpp

@@ -241,8 +241,9 @@ public:
 			_widget->elementHandleViaClick(bot);
 		}
 	}
-	bool elementIsChatWide() override {
-		return _widget ? _widget->elementIsChatWide() : false;
+	HistoryView::ElementChatMode elementChatMode() override {
+		using Mode = HistoryView::ElementChatMode;
+		return _widget ? _widget->elementChatMode() : Mode::Default;
 	}
 	not_null<Ui::PathShiftGradient*> elementPathShiftGradient() override {
 		Expects(_widget != nullptr);
@@ -808,7 +809,11 @@ bool HistoryInner::canHaveFromUserpics() const {
 	} else if (const auto channel = _peer->asBroadcast()) {
 		return channel->signatureProfiles();
 	}
-	return true;
+	return !_removeFromUserpics;
+}
+
+void HistoryInner::toggleRemoveFromUserpics(bool remove) {
+	_removeFromUserpics = remove;
 }
 
 template <typename Method>
@@ -3930,8 +3935,13 @@ void HistoryInner::elementHandleViaClick(not_null<UserData*> bot) {
 	_widget->insertBotCommand('@' + bot->username());
 }
 
-bool HistoryInner::elementIsChatWide() {
-	return _isChatWide;
+HistoryView::ElementChatMode HistoryInner::elementChatMode() {
+	using Mode = HistoryView::ElementChatMode;
+	return _isChatWide
+		? Mode::Wide
+		: _removeFromUserpics
+		? Mode::Narrow
+		: Mode::Default;
 }
 
 not_null<Ui::PathShiftGradient*> HistoryInner::elementPathShiftGradient() {

Telegram/SourceFiles/history/history_inner_widget.h

@@ -35,6 +35,7 @@ struct SelectionModeResult;
 struct StateRequest;
 enum class CursorState : char;
 enum class PointState : char;
+enum class ElementChatMode : char;
 class EmptyPainter;
 class Element;
 class TranslateTracker;
@@ -165,7 +166,7 @@ public:
 		const QString &query,
 		const FullMsgId &context);
 	void elementHandleViaClick(not_null<UserData*> bot);
-	bool elementIsChatWide();
+	HistoryView::ElementChatMode elementChatMode();
 	not_null<Ui::PathShiftGradient*> elementPathShiftGradient();
 	void elementReplyTo(const FullReplyTo &to);
 	void elementStartInteraction(not_null<const Element*> view);
@@ -193,6 +194,7 @@ public:
 
 	void setChooseReportReason(Data::ReportInput reportInput);
 	void clearChooseReportReason();
+	void toggleRemoveFromUserpics(bool remove);
 
 	// -1 if should not be visible, -2 if bad history()
 	[[nodiscard]] int itemTop(const HistoryItem *item) const;
@@ -493,6 +495,7 @@ private:
 	const std::unique_ptr<Ui::PathShiftGradient> _pathGradient;
 	QPainterPath _highlightPathCache;
 	bool _isChatWide = false;
+	bool _removeFromUserpics = false;
 
 	base::flat_set<not_null<const HistoryItem*>> _animatedStickersPlayed;
 	base::flat_map<not_null<PeerData*>, Ui::PeerUserpicView> _userpics;

Telegram/SourceFiles/history/history_widget.cpp

@@ -117,6 +117,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_reply.h"
 #include "history/view/history_view_requests_bar.h"
 #include "history/view/history_view_sticker_toast.h"
+#include "history/view/history_view_subsection_tabs.h"
 #include "history/view/history_view_translate_bar.h"
 #include "history/view/media/history_view_media.h"
 #include "profile/profile_block_group_members.h"
@@ -236,6 +237,7 @@ HistoryWidget::HistoryWidget(
 , _api(&controller->session().mtp())
 , _updateEditTimeLeftDisplay([=] { updateField(); })
 , _fieldBarCancel(this, st::historyReplyCancel)
+, _topBars(std::make_unique<Ui::RpWidget>(this))
 , _topBar(this, controller)
 , _scroll(
 	this,
@@ -1713,6 +1715,7 @@ void HistoryWidget::applyInlineBotQuery(UserData *bot, const QString &query) {
 void HistoryWidget::orderWidgets() {
 	_voiceRecordBar->raise();
 	_send->raise();
+	_topBars->raise();
 	if (_businessBotStatus) {
 		_businessBotStatus->bar().raise();
 	}
@@ -1740,6 +1743,9 @@ void HistoryWidget::orderWidgets() {
 	if (_chooseTheme) {
 		_chooseTheme->raise();
 	}
+	if (_subsectionTabs) {
+		_subsectionTabs->raise();
+	}
 	_topShadow->raise();
 	if (_autocomplete) {
 		_autocomplete->raise();
@@ -2467,6 +2473,11 @@ void HistoryWidget::showHistory(
 		_fieldDisabled = nullptr;
 		_silent.destroy();
 		updateBotKeyboard();
+
+		if (_subsectionTabs) {
+			_subsectionTabsLifetime.destroy();
+			controller()->saveSubsectionTabs(base::take(_subsectionTabs));
+		}
 	} else {
 		Assert(_list == nullptr);
 	}
@@ -2501,7 +2512,7 @@ void HistoryWidget::showHistory(
 		_peer = session().data().peer(peerId);
 		_contactStatus = std::make_unique<ContactStatus>(
 			controller(),
-			this,
+			_topBars.get(),
 			_peer,
 			false);
 		_contactStatus->bar().heightValue(
@@ -2514,7 +2525,7 @@ void HistoryWidget::showHistory(
 		if (const auto user = _peer->asUser()) {
 			_paysStatus = std::make_unique<PaysStatus>(
 				controller(),
-				this,
+				_topBars.get(),
 				user);
 			_paysStatus->bar().heightValue(
 			) | rpl::start_with_next([=] {
@@ -2522,7 +2533,7 @@ void HistoryWidget::showHistory(
 			}, _paysStatus->bar().lifetime());
 			_businessBotStatus = std::make_unique<BusinessBotStatus>(
 				controller(),
-				this,
+				_topBars.get(),
 				user);
 			_businessBotStatus->bar().heightValue(
 			) | rpl::start_with_next([=] {
@@ -3194,29 +3205,12 @@ void HistoryWidget::updateControlsVisibility() {
 	} else if (!_firstLoadRequest && _scroll->isHidden()) {
 		_scroll->show();
 	}
-	if (_pinnedBar) {
-		_pinnedBar->show();
-	}
+	_topBars->show();
 	if (_sponsoredMessageBar && checkSponsoredMessageBarVisibility()) {
 		_sponsoredMessageBar->toggle(true, anim::type::normal);
 	}
-	if (_translateBar) {
-		_translateBar->show();
-	}
-	if (_groupCallBar) {
-		_groupCallBar->show();
-	}
-	if (_requestsBar) {
-		_requestsBar->show();
-	}
-	if (_paysStatus) {
-		_paysStatus->show();
-	}
-	if (_contactStatus) {
-		_contactStatus->show();
-	}
-	if (_businessBotStatus) {
-		_businessBotStatus->show();
+	if (_subsectionTabs) {
+		_subsectionTabs->show();
 	}
 	if (isChoosingTheme()
 		|| (!editingMessage()
@@ -4431,20 +4425,12 @@ void HistoryWidget::hideChildWidgets() {
 	if (_tabbedPanel) {
 		_tabbedPanel->hideFast();
 	}
-	if (_pinnedBar) {
-		_pinnedBar->hide();
-	}
 	if (_sponsoredMessageBar) {
 		_sponsoredMessageBar->toggle(false, anim::type::instant);
 	}
-	if (_translateBar) {
-		_translateBar->hide();
-	}
-	if (_groupCallBar) {
-		_groupCallBar->hide();
-	}
-	if (_requestsBar) {
-		_requestsBar->hide();
+	_topBars->hide();
+	if (_subsectionTabs) {
+		_subsectionTabs->hide();
 	}
 	if (_voiceRecordBar) {
 		_voiceRecordBar->hideFast();
@@ -4455,15 +4441,6 @@ void HistoryWidget::hideChildWidgets() {
 	if (_chooseTheme) {
 		_chooseTheme->hide();
 	}
-	if (_paysStatus) {
-		_paysStatus->hide();
-	}
-	if (_contactStatus) {
-		_contactStatus->hide();
-	}
-	if (_businessBotStatus) {
-		_businessBotStatus->hide();
-	}
 	hideChildren();
 }
 
@@ -4747,6 +4724,8 @@ MsgId HistoryWidget::msgId() const {
 void HistoryWidget::showAnimated(
 		Window::SlideDirection direction,
 		const Window::SectionSlideParams &params) {
+	validateSubsectionTabs();
+
 	_showAnimation = nullptr;
 
 	// If we show pinned bar here, we don't want it to change the
@@ -4791,6 +4770,11 @@ void HistoryWidget::showAnimated(
 	activate();
 }
 
+void HistoryWidget::showFast() {
+	validateSubsectionTabs();
+	show();
+}
+
 void HistoryWidget::showFinished() {
 	_cornerButtons.finishAnimations();
 	if (_pinnedBar) {
@@ -6419,40 +6403,50 @@ void HistoryWidget::resizeEvent(QResizeEvent *e) {
 }
 
 void HistoryWidget::updateControlsGeometry() {
-	_topBar->resizeToWidth(width());
+	const auto width = this->width();
+
+	_topBar->resizeToWidth(width);
 	_topBar->moveToLeft(0, 0);
-	_voiceRecordBar->resizeToWidth(width());
+
+	const auto tabsLeftSkip = _subsectionTabs
+		? _subsectionTabs->leftSkip()
+		: 0;
+	const auto innerWidth = width - tabsLeftSkip;
+
+	_voiceRecordBar->resizeToWidth(width);
 
 	moveFieldControls();
 
-	const auto groupCallTop = _topBar->bottomNoMargins();
+	_topBars->move(tabsLeftSkip, _topBar->bottomNoMargins()
+		+ (_subsectionTabs ? _subsectionTabs->topSkip() : 0));
+	const auto groupCallTop = 0;
 	if (_groupCallBar) {
 		_groupCallBar->move(0, groupCallTop);
-		_groupCallBar->resizeToWidth(width());
+		_groupCallBar->resizeToWidth(innerWidth);
 	}
 	const auto requestsTop = groupCallTop
 		+ (_groupCallBar ? _groupCallBar->height() : 0);
 	if (_requestsBar) {
 		_requestsBar->move(0, requestsTop);
-		_requestsBar->resizeToWidth(width());
+		_requestsBar->resizeToWidth(innerWidth);
 	}
 	const auto pinnedBarTop = requestsTop
 		+ (_requestsBar ? _requestsBar->height() : 0);
 	if (_pinnedBar) {
 		_pinnedBar->move(0, pinnedBarTop);
-		_pinnedBar->resizeToWidth(width());
+		_pinnedBar->resizeToWidth(innerWidth);
 	}
 	const auto sponsoredMessageBarTop = pinnedBarTop
 		+ (_pinnedBar ? _pinnedBar->height() : 0);
 	if (_sponsoredMessageBar) {
 		_sponsoredMessageBar->move(0, sponsoredMessageBarTop);
-		_sponsoredMessageBar->resizeToWidth(width());
+		_sponsoredMessageBar->resizeToWidth(innerWidth);
 	}
 	const auto translateTop = sponsoredMessageBarTop
 		+ (_sponsoredMessageBar ? _sponsoredMessageBar->height() : 0);
 	if (_translateBar) {
 		_translateBar->move(0, translateTop);
-		_translateBar->resizeToWidth(width());
+		_translateBar->resizeToWidth(innerWidth);
 	}
 	const auto paysStatusTop = translateTop
 		+ (_translateBar ? _translateBar->height() : 0);
@@ -6462,17 +6456,19 @@ void HistoryWidget::updateControlsGeometry() {
 	const auto contactStatusTop = paysStatusTop
 		+ (_paysStatus ? _paysStatus->bar().height() : 0);
 	if (_contactStatus) {
-		_contactStatus->bar().move(0, contactStatusTop);
+		_contactStatus->bar().move(tabsLeftSkip, contactStatusTop);
 	}
 	const auto businessBotTop = contactStatusTop
 		+ (_contactStatus ? _contactStatus->bar().height() : 0);
 	if (_businessBotStatus) {
-		_businessBotStatus->bar().move(0, businessBotTop);
+		_businessBotStatus->bar().move(tabsLeftSkip, businessBotTop);
 	}
-	const auto scrollAreaTop = businessBotTop
+	const auto scrollAreaTop = _topBars->y()
+		+ businessBotTop
 		+ (_businessBotStatus ? _businessBotStatus->bar().height() : 0);
+	_topBars->resize(innerWidth, scrollAreaTop - _topBars->y());
 	if (_scroll->y() != scrollAreaTop) {
-		_scroll->moveToLeft(0, scrollAreaTop);
+		_scroll->moveToLeft(tabsLeftSkip, scrollAreaTop);
 		if (_autocomplete) {
 			_autocomplete->setBoundings(_scroll->geometry());
 		}
@@ -6502,7 +6498,7 @@ void HistoryWidget::updateControlsGeometry() {
 	_topShadow->setGeometryToLeft(
 		topShadowLeft,
 		_topBar->bottomNoMargins(),
-		width() - topShadowLeft - topShadowRight,
+		width - topShadowLeft - topShadowRight,
 		st::lineWidth);
 }
 
@@ -6704,7 +6700,12 @@ void HistoryWidget::updateHistoryGeometry(
 		return;
 	}
 
-	auto newScrollHeight = height() - _topBar->height();
+	const auto newScrollWidth = width()
+		- (_subsectionTabs ? _subsectionTabs->leftSkip() : 0);
+	const auto subsectionTabsTop = _topBar->bottomNoMargins();
+	auto newScrollHeight = height()
+		- subsectionTabsTop
+		- (_subsectionTabs ? _subsectionTabs->topSkip() : 0);
 	if (_translateBar) {
 		newScrollHeight -= _translateBar->height();
 	}
@@ -6760,10 +6761,10 @@ void HistoryWidget::updateHistoryGeometry(
 	}
 	const auto wasScrollTop = _scroll->scrollTop();
 	const auto wasAtBottom = (wasScrollTop == _scroll->scrollTopMax());
-	const auto needResize = (_scroll->width() != width())
+	const auto needResize = (_scroll->width() != newScrollWidth)
 		|| (_scroll->height() != newScrollHeight);
 	if (needResize) {
-		_scroll->resize(width(), newScrollHeight);
+		_scroll->resize(newScrollWidth, newScrollHeight);
 		// on initial updateListSize we didn't put the _scroll->scrollTop
 		// correctly yet so visibleAreaUpdated() call will erase it
 		// with the new (undefined) value
@@ -6781,6 +6782,12 @@ void HistoryWidget::updateHistoryGeometry(
 		_cornerButtons.updatePositions();
 		controller()->floatPlayerAreaUpdated();
 	}
+	if (_subsectionTabs) {
+		const auto scrollBottom = _scroll->y() + newScrollHeight;
+		const auto areaHeight = scrollBottom - subsectionTabsTop;
+		_subsectionTabs->setBoundingRect(
+			{ 0, subsectionTabsTop, width(), areaHeight });
+	}
 
 	updateListSize();
 	_updateHistoryGeometryRequired = false;
@@ -7625,7 +7632,7 @@ void HistoryWidget::setupTranslateBar() {
 	Expects(_history != nullptr);
 
 	_translateBar = std::make_unique<HistoryView::TranslateBar>(
-		this,
+		_topBars.get(),
 		controller(),
 		_history);
 
@@ -7700,7 +7707,7 @@ void HistoryWidget::checkPinnedBarState() {
 	}
 
 	clearHidingPinnedBar();
-	_pinnedBar = std::make_unique<Ui::PinnedBar>(this, [=] {
+	_pinnedBar = std::make_unique<Ui::PinnedBar>(_topBars.get(), [=] {
 		return controller()->isGifPausedAtLeastFor(
 			Window::GifPauseReason::Any);
 	}, controller()->gifPauseLevelChanged());
@@ -7921,7 +7928,7 @@ void HistoryWidget::setupGroupCallBar() {
 		return;
 	}
 	_groupCallBar = std::make_unique<Ui::GroupCallBar>(
-		this,
+		_topBars.get(),
 		HistoryView::GroupCallBarContentByPeer(
 			peer,
 			st::historyGroupCallUserpics.size,
@@ -7974,7 +7981,7 @@ void HistoryWidget::setupRequestsBar() {
 		return;
 	}
 	_requestsBar = std::make_unique<Ui::RequestsBar>(
-		this,
+		_topBars.get(),
 		HistoryView::RequestsBarContentByPeer(
 			peer,
 			st::historyRequestsUserpics.size,
@@ -8087,7 +8094,7 @@ void HistoryWidget::checkSponsoredMessageBar() {
 
 void HistoryWidget::createSponsoredMessageBar() {
 	_sponsoredMessageBar = base::make_unique_q<Ui::SlideWrap<>>(
-		this,
+		_topBars.get(),
 		object_ptr<Ui::RpWidget>(this));
 
 	_sponsoredMessageBar->entity()->resizeToWidth(_scroll->width());
@@ -8250,6 +8257,34 @@ void HistoryWidget::showPremiumToast(not_null<DocumentData*> document) {
 	_stickerToast->showFor(document);
 }
 
+void HistoryWidget::validateSubsectionTabs() {
+	if (!_history || !HistoryView::SubsectionTabs::UsedFor(_history)) {
+		_subsectionTabsLifetime.destroy();
+		_subsectionTabs = nullptr;
+		return;
+	} else if (_subsectionTabs) {
+		return;
+	}
+	_subsectionTabs = controller()->restoreSubsectionTabsFor(this, _history);
+	if (!_subsectionTabs) {
+		_subsectionTabs = std::make_unique<HistoryView::SubsectionTabs>(
+			controller(),
+			this,
+			_history);
+	}
+	_subsectionTabs->removeRequests() | rpl::start_with_next([=] {
+		_subsectionTabs = nullptr;
+		updateControlsGeometry();
+	}, _subsectionTabsLifetime);
+	_subsectionTabs->layoutRequests() | rpl::start_with_next([=] {
+		_list->toggleRemoveFromUserpics(_subsectionTabs->leftSkip() > 0);
+		updateControlsGeometry();
+		orderWidgets();
+	}, _subsectionTabsLifetime);
+	updateControlsGeometry();
+	orderWidgets();
+}
+
 void HistoryWidget::checkCharsCount() {
 	_fieldCharsCountManager.setCount(Ui::ComputeFieldCharacterCount(_field));
 	checkCharsLimitation();
@@ -9439,5 +9474,7 @@ HistoryWidget::~HistoryWidget() {
 
 		session().data().itemVisibilitiesUpdated();
 	}
+	_subsectionTabsLifetime.destroy();
+	_subsectionTabs = nullptr;
 	setTabbedPanel(nullptr);
 }

Telegram/SourceFiles/history/history_widget.h

@@ -107,6 +107,7 @@ class Element;
 class PinnedTracker;
 class TranslateBar;
 class ComposeSearch;
+class SubsectionTabs;
 struct SelectedQuote;
 } // namespace HistoryView
 
@@ -183,6 +184,7 @@ public:
 	void showAnimated(
 		Window::SlideDirection direction,
 		const Window::SectionSlideParams &params);
+	void showFast();
 	void finishAnimating();
 
 	void doneShow();
@@ -684,6 +686,8 @@ private:
 
 	void switchToSearch(QString query);
 
+	void validateSubsectionTabs();
+
 	void checkCharsCount();
 	void checkCharsLimitation();
 
@@ -707,6 +711,8 @@ private:
 
 	object_ptr<Ui::IconButton> _fieldBarCancel;
 
+	std::unique_ptr<Ui::RpWidget> _topBars;
+
 	std::unique_ptr<HistoryView::TranslateBar> _translateBar;
 	int _translateBarHeight = 0;
 
@@ -821,6 +827,8 @@ private:
 	const std::unique_ptr<VoiceRecordBar> _voiceRecordBar;
 	const std::unique_ptr<ForwardPanel> _forwardPanel;
 	std::unique_ptr<HistoryView::ComposeSearch> _composeSearch;
+	std::unique_ptr<HistoryView::SubsectionTabs> _subsectionTabs;
+	rpl::lifetime _subsectionTabsLifetime;
 	bool _cmdStartShown = false;
 	object_ptr<Ui::InputField> _field;
 	base::unique_qptr<Ui::RpWidget> _fieldDisabled;

Telegram/SourceFiles/history/view/history_view_chat_section.cpp

@@ -17,6 +17,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_contact_status.h"
 #include "history/view/history_view_scheduled_section.h"
 #include "history/view/history_view_service_message.h"
+#include "history/view/history_view_subsection_tabs.h"
 #include "history/view/history_view_pinned_tracker.h"
 #include "history/view/history_view_pinned_section.h"
 #include "history/view/history_view_translate_bar.h"
@@ -237,6 +238,7 @@ ChatWidget::ChatWidget(
 	: nullptr)
 , _topBar(this, controller)
 , _topBarShadow(this)
+, _topBars(std::make_unique<Ui::RpWidget>(this))
 , _composeControls(std::make_unique<ComposeControls>(
 	this,
 	ComposeControlsDescriptor{
@@ -256,7 +258,8 @@ ChatWidget::ChatWidget(
 			}) | rpl::type_erased()
 			: rpl::single(false),
 	}))
-, _translateBar(std::make_unique<TranslateBar>(this, controller, _history))
+, _translateBar(
+	std::make_unique<TranslateBar>(_topBars.get(), controller, _history))
 , _scroll(std::make_unique<Ui::ScrollArea>(
 	this,
 	controller->chatStyle()->value(lifetime(), st::historyScroll),
@@ -444,6 +447,10 @@ ChatWidget::~ChatWidget() {
 	if (_repliesRootId) {
 		controller()->sendingAnimation().clear();
 	}
+	if (_subsectionTabs) {
+		_subsectionTabsLifetime.destroy();
+		controller()->saveSubsectionTabs(base::take(_subsectionTabs));
+	}
 	if (_topic) {
 		if (_topic->creating()) {
 			_emptyPainter = nullptr;
@@ -471,9 +478,10 @@ void ChatWidget::orderWidgets() {
 	if (_pinnedBar) {
 		_pinnedBar->raise();
 	}
-	if (_topBar) {
-		_topBar->raise();
+	if (_subsectionTabs) {
+		_subsectionTabs->raise();
 	}
+	_topBar->raise();
 	_topBarShadow->raise();
 	_composeControls->raisePanels();
 }
@@ -499,7 +507,7 @@ void ChatWidget::setupRootView() {
 	if (_topic || !_repliesRootId) {
 		return;
 	}
-	_repliesRootView = std::make_unique<Ui::PinnedBar>(this, [=] {
+	_repliesRootView = std::make_unique<Ui::PinnedBar>(_topBars.get(), [=] {
 		return controller()->isGifPausedAtLeastFor(
 			Window::GifPauseReason::Any);
 	}, controller()->gifPauseLevelChanged());
@@ -577,7 +585,9 @@ void ChatWidget::setupTopicViewer() {
 void ChatWidget::subscribeToTopic() {
 	Expects(_topic != nullptr);
 
-	_topicReopenBar = std::make_unique<TopicReopenBar>(this, _topic);
+	_topicReopenBar = std::make_unique<TopicReopenBar>(
+		_topBars.get(),
+		_topic);
 	_topicReopenBar->bar().setVisible(!animatingShow());
 	_topicReopenBarHeight = _topicReopenBar->bar().height();
 	_topicReopenBar->bar().heightValue(
@@ -1509,6 +1519,37 @@ void ChatWidget::edit(
 	doSetInnerFocus();
 }
 
+void ChatWidget::validateSubsectionTabs() {
+	if (!HistoryView::SubsectionTabs::UsedFor(_history)) {
+		_subsectionTabsLifetime.destroy();
+		_subsectionTabs = nullptr;
+		return;
+	} else if (_subsectionTabs) {
+		return;
+	}
+	const auto thread = _topic ? (Data::Thread*)_topic : _sublist;
+	_subsectionTabs = controller()->restoreSubsectionTabsFor(this, thread);
+	if (!_subsectionTabs) {
+		_subsectionTabs = std::make_unique<HistoryView::SubsectionTabs>(
+			controller(),
+			this,
+			thread);
+	}
+	_subsectionTabs->removeRequests() | rpl::start_with_next([=] {
+		_subsectionTabs = nullptr;
+		updateControlsGeometry();
+	}, _subsectionTabsLifetime);
+	_subsectionTabs->layoutRequests() | rpl::start_with_next([=] {
+		_inner->overrideChatMode((_subsectionTabs->leftSkip() > 0)
+			? ElementChatMode::Narrow
+			: std::optional<ElementChatMode>());
+		updateControlsGeometry();
+		orderWidgets();
+	}, _subsectionTabsLifetime);
+	updateControlsGeometry();
+	orderWidgets();
+}
+
 void ChatWidget::refreshJoinGroupButton() {
 	if (!_repliesRootId) {
 		return;
@@ -1937,7 +1978,7 @@ void ChatWidget::checkPinnedBarState() {
 	}
 
 	clearHidingPinnedBar();
-	_pinnedBar = std::make_unique<Ui::PinnedBar>(this, [=] {
+	_pinnedBar = std::make_unique<Ui::PinnedBar>(_topBars.get(), [=] {
 		return controller()->isGifPausedAtLeastFor(
 			Window::GifPauseReason::Any);
 	}, controller()->gifPauseLevelChanged());
@@ -2252,13 +2293,10 @@ QPixmap ChatWidget::grabForShowAnimation(const Window::SectionSlideParams &param
 	if (params.withTopBarShadow) {
 		_topBarShadow->show();
 	}
-	if (_repliesRootView) {
-		_repliesRootView->hide();
+	_topBars->hide();
+	if (_subsectionTabs) {
+		_subsectionTabs->hide();
 	}
-	if (_pinnedBar) {
-		_pinnedBar->hide();
-	}
-	_translateBar->hide();
 	return result;
 }
 
@@ -2529,13 +2567,20 @@ void ChatWidget::updateControlsGeometry() {
 		: 0;
 	_topBar->resizeToWidth(contentWidth);
 	_topBarShadow->resize(contentWidth, st::lineWidth);
+	const auto tabsLeftSkip = _subsectionTabs
+		? _subsectionTabs->leftSkip()
+		: 0;
+	const auto innerWidth = contentWidth - tabsLeftSkip;
+	const auto subsectionTabsTop = _topBar->bottomNoMargins();
+	_topBars->move(tabsLeftSkip, subsectionTabsTop
+		+ (_subsectionTabs ? _subsectionTabs->topSkip() : 0));
 	if (_repliesRootView) {
-		_repliesRootView->resizeToWidth(contentWidth);
+		_repliesRootView->resizeToWidth(innerWidth);
 	}
-	auto top = _topBar->height() + _repliesRootViewHeight;
+	auto top = _repliesRootViewHeight;
 	if (_pinnedBar) {
 		_pinnedBar->move(0, top);
-		_pinnedBar->resizeToWidth(contentWidth);
+		_pinnedBar->resizeToWidth(innerWidth);
 		top += _pinnedBarHeight;
 	}
 	if (_topicReopenBar) {
@@ -2543,7 +2588,7 @@ void ChatWidget::updateControlsGeometry() {
 		top += _topicReopenBar->bar().height();
 	}
 	_translateBar->move(0, top);
-	_translateBar->resizeToWidth(contentWidth);
+	_translateBar->resizeToWidth(innerWidth);
 	top += _translateBarHeight;
 
 	auto bottom = height();
@@ -2563,15 +2608,18 @@ void ChatWidget::updateControlsGeometry() {
 		bottom -= _composeControls->heightCurrent();
 	}
 
+	_topBars->resize(innerWidth, top);
+	top += _topBars->y();
+
 	const auto scrollHeight = bottom - top;
-	const auto scrollSize = QSize(contentWidth, scrollHeight);
+	const auto scrollSize = QSize(innerWidth, scrollHeight);
 	if (_scroll->size() != scrollSize) {
 		_skipScrollEvent = true;
 		_scroll->resize(scrollSize);
 		_inner->resizeToWidth(scrollSize.width(), _scroll->height());
 		_skipScrollEvent = false;
 	}
-	_scroll->move(0, top);
+	_scroll->move(tabsLeftSkip, top);
 	if (!_scroll->isHidden()) {
 		if (newScrollTop) {
 			_scroll->scrollToY(*newScrollTop);
@@ -2581,6 +2629,13 @@ void ChatWidget::updateControlsGeometry() {
 	_composeControls->move(0, bottom);
 	_composeControls->setAutocompleteBoundingRect(_scroll->geometry());
 
+	if (_subsectionTabs) {
+		const auto scrollBottom = _scroll->y() + scrollHeight;
+		const auto areaHeight = scrollBottom - subsectionTabsTop;
+		_subsectionTabs->setBoundingRect(
+			{ 0, subsectionTabsTop, width(), areaHeight });
+	}
+
 	_cornerButtons.updatePositions();
 }
 
@@ -2700,15 +2755,9 @@ void ChatWidget::showFinishedHook() {
 		_composeControls->showFinished();
 	}
 	_inner->showFinished();
-	if (_repliesRootView) {
-		_repliesRootView->show();
-	}
-	if (_pinnedBar) {
-		_pinnedBar->show();
-	}
-	_translateBar->show();
-	if (_topicReopenBar) {
-		_topicReopenBar->bar().show();
+	_topBars->show();
+	if (_subsectionTabs) {
+		_subsectionTabs->show();
 	}
 
 	// We should setup the drag area only after

Telegram/SourceFiles/history/view/history_view_chat_section.h

@@ -73,6 +73,7 @@ class TopicReopenBar;
 class EmptyPainter;
 class PinnedTracker;
 class TranslateBar;
+class SubsectionTabs;
 
 struct ChatViewId {
 	not_null<History*> history;
@@ -372,6 +373,7 @@ private:
 		Api::SendOptions options,
 		std::optional<MsgId> localMessageId);
 
+	void validateSubsectionTabs() override;
 	void setupEmptyPainter();
 	void refreshJoinGroupButton();
 	[[nodiscard]] bool emptyShown() const;
@@ -396,6 +398,7 @@ private:
 	QPointer<ListWidget> _inner;
 	object_ptr<TopBarWidget> _topBar;
 	object_ptr<Ui::PlainShadow> _topBarShadow;
+	std::unique_ptr<Ui::RpWidget> _topBars;
 	std::unique_ptr<ComposeControls> _composeControls;
 	std::unique_ptr<ComposeSearch> _composeSearch;
 	std::unique_ptr<Ui::FlatButton> _joinGroup;
@@ -404,6 +407,8 @@ private:
 	std::unique_ptr<Ui::FlatButton> _openChatButton;
 	std::unique_ptr<Ui::RpWidget> _aboutHiddenAuthor;
 	std::unique_ptr<EmptyPainter> _emptyPainter;
+	std::unique_ptr<SubsectionTabs> _subsectionTabs;
+	rpl::lifetime _subsectionTabsLifetime;
 	bool _canSendTexts = false;
 	bool _skipScrollEvent = false;
 	bool _synteticScrollEvent = false;

Telegram/SourceFiles/history/view/history_view_element.cpp

@@ -262,8 +262,8 @@ void DefaultElementDelegate::elementHandleViaClick(
 	not_null<UserData*> bot) {
 }
 
-bool DefaultElementDelegate::elementIsChatWide() {
-	return false;
+ElementChatMode DefaultElementDelegate::elementChatMode() {
+	return ElementChatMode::Default;
 }
 
 void DefaultElementDelegate::elementReplyTo(const FullReplyTo &to) {
@@ -410,7 +410,7 @@ void UnreadBar::paint(
 		const PaintContext &context,
 		int y,
 		int w,
-		bool chatWide) const {
+		ElementChatMode mode) const {
 	const auto previousTranslation = p.transform().dx();
 	if (previousTranslation != 0) {
 		p.translate(-previousTranslation, 0);
@@ -434,7 +434,7 @@ void UnreadBar::paint(
 	p.setPen(st->historyUnreadBarFg());
 
 	int maxwidth = w;
-	if (chatWide) {
+	if (mode == ElementChatMode::Wide) {
 		maxwidth = qMin(
 			maxwidth,
 			st::msgMaxWidth
@@ -609,9 +609,9 @@ void ServicePreMessage::init(PreparedServiceText string) {
 	}
 }
 
-int ServicePreMessage::resizeToWidth(int newWidth, bool chatWide) {
+int ServicePreMessage::resizeToWidth(int newWidth, ElementChatMode mode) {
 	width = newWidth;
-	if (chatWide) {
+	if (mode == ElementChatMode::Wide) {
 		accumulate_min(
 			width,
 			st::msgMaxWidth + 2 * st::msgPhotoSkip + 2 * st::msgMargin.left());
@@ -644,7 +644,7 @@ void ServicePreMessage::paint(
 		Painter &p,
 		const PaintContext &context,
 		QRect g,
-		bool chatWide) const {
+		ElementChatMode mode) const {
 	const auto top = g.top() - height - st::msgMargin.top();
 	p.translate(0, top);
 
@@ -987,7 +987,8 @@ not_null<PurchasedTag*> Element::enforcePurchasedTag() {
 int Element::AdditionalSpaceForSelectionCheckbox(
 		not_null<const Element*> view,
 		QRect countedGeometry) {
-	if (!view->hasOutLayout() || view->delegate()->elementIsChatWide()) {
+	if (!view->hasOutLayout()
+		|| view->delegate()->elementChatMode() == ElementChatMode::Wide) {
 		return 0;
 	}
 	if (countedGeometry.isEmpty()) {
@@ -1698,7 +1699,8 @@ bool Element::hasOutLayout() const {
 }
 
 bool Element::hasRightLayout() const {
-	return hasOutLayout() && !_delegate->elementIsChatWide();
+	return hasOutLayout()
+		&& (_delegate->elementChatMode() != ElementChatMode::Wide);
 }
 
 bool Element::drawBubble() const {

Telegram/SourceFiles/history/view/history_view_element.h

@@ -78,6 +78,12 @@ struct SelectionModeResult {
 	float64 progress = 0.0;
 };
 
+enum class ElementChatMode : char {
+	Default,
+	Wide,
+	Narrow, // monoforum with left tabs
+};
+
 class Element;
 class ElementDelegate {
 public:
@@ -114,7 +120,7 @@ public:
 		const QString &query,
 		const FullMsgId &context) = 0;
 	virtual void elementHandleViaClick(not_null<UserData*> bot) = 0;
-	virtual bool elementIsChatWide() = 0;
+	virtual ElementChatMode elementChatMode() = 0;
 	virtual not_null<Ui::PathShiftGradient*> elementPathShiftGradient() = 0;
 	virtual void elementReplyTo(const FullReplyTo &to) = 0;
 	virtual void elementStartInteraction(not_null<const Element*> view) = 0;
@@ -169,7 +175,7 @@ public:
 		const QString &query,
 		const FullMsgId &context) override;
 	void elementHandleViaClick(not_null<UserData*> bot) override;
-	bool elementIsChatWide() override;
+	ElementChatMode elementChatMode() override;
 	void elementReplyTo(const FullReplyTo &to) override;
 	void elementStartInteraction(not_null<const Element*> view) override;
 	void elementStartPremium(
@@ -233,7 +239,7 @@ struct UnreadBar : RuntimeComponent<UnreadBar, Element> {
 		const PaintContext &context,
 		int y,
 		int w,
-		bool chatWide) const;
+		ElementChatMode mode) const;
 
 	QString text;
 	int width = 0;
@@ -305,13 +311,13 @@ private:
 struct ServicePreMessage : RuntimeComponent<ServicePreMessage, Element> {
 	void init(PreparedServiceText string);
 
-	int resizeToWidth(int newWidth, bool chatWide);
+	int resizeToWidth(int newWidth, ElementChatMode mode);
 
 	void paint(
 		Painter &p,
 		const PaintContext &context,
 		QRect g,
-		bool chatWide) const;
+		ElementChatMode mode) const;
 	[[nodiscard]] ClickHandlerPtr textState(
 		QPoint point,
 		const StateRequest &request,

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -1898,8 +1898,10 @@ void ListWidget::elementHandleViaClick(not_null<UserData*> bot) {
 	_delegate->listHandleViaClick(bot);
 }
 
-bool ListWidget::elementIsChatWide() {
-	return _overrideIsChatWide.value_or(_isChatWide);
+ElementChatMode ListWidget::elementChatMode() {
+	return _overrideChatMode.value_or(_isChatWide
+		? ElementChatMode::Wide
+		: ElementChatMode::Default);
 }
 
 not_null<Ui::PathShiftGradient*> ListWidget::elementPathShiftGradient() {
@@ -4284,8 +4286,8 @@ void ListWidget::setEmptyInfoWidget(base::unique_qptr<Ui::RpWidget> &&w) {
 	}
 }
 
-void ListWidget::overrideIsChatWide(bool isWide) {
-	_overrideIsChatWide = isWide;
+void ListWidget::overrideChatMode(std::optional<ElementChatMode> mode) {
+	_overrideChatMode = mode;
 }
 
 ListWidget::~ListWidget() {

Telegram/SourceFiles/history/view/history_view_list_widget.h

@@ -428,7 +428,7 @@ public:
 		const QString &query,
 		const FullMsgId &context) override;
 	void elementHandleViaClick(not_null<UserData*> bot) override;
-	bool elementIsChatWide() override;
+	ElementChatMode elementChatMode() override;
 	not_null<Ui::PathShiftGradient*> elementPathShiftGradient() override;
 	void elementReplyTo(const FullReplyTo &to) override;
 	void elementStartInteraction(not_null<const Element*> view) override;
@@ -443,7 +443,7 @@ public:
 	bool elementHideTopicButton(not_null<const Element*> view) override;
 
 	void setEmptyInfoWidget(base::unique_qptr<Ui::RpWidget> &&w);
-	void overrideIsChatWide(bool isWide);
+	void overrideChatMode(std::optional<ElementChatMode> mode);
 
 	~ListWidget();
 
@@ -834,7 +834,7 @@ private:
 	bool _refreshingViewer = false;
 	bool _showFinished = false;
 	bool _resizePending = false;
-	std::optional<bool> _overrideIsChatWide;
+	std::optional<ElementChatMode> _overrideChatMode;
 
 	// _menu must be destroyed before _whoReactedMenuLifetime.
 	rpl::lifetime _whoReactedMenuLifetime;

Telegram/SourceFiles/history/view/history_view_message.cpp

@@ -1142,18 +1142,13 @@ void Message::draw(Painter &p, const PaintContext &context) const {
 		}
 		if (context.clip.intersects(QRect(0, aboveh, width(), unreadbarh))) {
 			p.translate(0, aboveh);
-			bar->paint(
-				p,
-				context,
-				0,
-				width(),
-				delegate()->elementIsChatWide());
+			bar->paint(p, context, 0, width(), delegate()->elementChatMode());
 			p.translate(0, -aboveh);
 		}
 	}
 
 	if (const auto service = Get<ServicePreMessage>()) {
-		service->paint(p, context, g, delegate()->elementIsChatWide());
+		service->paint(p, context, g, delegate()->elementChatMode());
 	}
 
 	if (isHidden()) {
@@ -1549,8 +1544,8 @@ void Message::draw(Painter &p, const PaintContext &context) const {
 		constexpr auto kMaxHeightRatio = 3.5;
 		constexpr auto kStrokeWidth = 2.;
 		constexpr auto kWaveWidth = 10.;
-		const auto isLeftSize = (!context.outbg)
-			|| delegate()->elementIsChatWide();
+		const auto isLeftSize = !context.outbg
+			|| (delegate()->elementChatMode() == ElementChatMode::Wide);
 		const auto ratio = std::min(context.gestureHorizontal.ratio, 1.);
 		const auto reachRatio = context.gestureHorizontal.reachRatio;
 		const auto size = st::historyFastShareSize;
@@ -1635,7 +1630,8 @@ void Message::draw(Painter &p, const PaintContext &context) const {
 			}
 			const auto o = ScopedPainterOpacity(p, progress);
 			const auto &st = st::msgSelectionCheck;
-			const auto right = delegate()->elementIsChatWide()
+			const auto right = (delegate()->elementChatMode()
+				== ElementChatMode::Wide)
 				? std::min(
 					int(_bubbleWidthLimit
 						+ st::msgPhotoSkip
@@ -2465,7 +2461,7 @@ bool Message::hasFromPhoto() const {
 	case Context::AdminLog:
 		return true;
 	case Context::Monoforum:
-		return delegate()->elementIsChatWide();
+		return (delegate()->elementChatMode() == ElementChatMode::Wide);
 	case Context::History:
 	case Context::ChatPreview:
 	case Context::TTLViewer:
@@ -2484,8 +2480,10 @@ bool Message::hasFromPhoto() const {
 			|| item->isFakeAboutView()
 			|| (context() == Context::Replies && item->isDiscussionPost())) {
 			return false;
-		} else if (delegate()->elementIsChatWide()) {
-			return true;
+		}
+		const auto mode = delegate()->elementChatMode();
+		if (mode != ElementChatMode::Default) {
+			return (mode == ElementChatMode::Wide);
 		} else if (item->history()->peer->isVerifyCodes()) {
 			return !hasOutLayout();
 		} else if (item->Has<HistoryMessageForwarded>()) {
@@ -4385,12 +4383,15 @@ QRect Message::countGeometry() const {
 		? media->width()
 		: width();
 	const auto outbg = hasOutLayout();
+	const auto useMoreSpace = (delegate()->elementChatMode()
+		== ElementChatMode::Narrow);
+	const auto wideSkip = useMoreSpace
+		? st::msgMargin.left()
+		: st::msgMargin.right();
 	const auto availableWidth = width()
 		- st::msgMargin.left()
-		- (centeredView ? st::msgMargin.left() : st::msgMargin.right());
-	auto contentLeft = hasRightLayout()
-		? st::msgMargin.right()
-		: st::msgMargin.left();
+		- (centeredView ? st::msgMargin.left() : wideSkip);
+	auto contentLeft = hasRightLayout() ? wideSkip : st::msgMargin.left();
 	auto contentWidth = availableWidth;
 	if (hasFromPhoto()) {
 		contentLeft += st::msgPhotoSkip;
@@ -4411,7 +4412,8 @@ QRect Message::countGeometry() const {
 			contentWidth = mediaWidth;
 		}
 	}
-	if (contentWidth < availableWidth && !delegate()->elementIsChatWide()) {
+	if (contentWidth < availableWidth
+		&& delegate()->elementChatMode() != ElementChatMode::Wide) {
 		if (outbg) {
 			contentLeft += availableWidth - contentWidth;
 		} else if (centeredView) {
@@ -4500,7 +4502,7 @@ int Message::resizeContentGetHeight(int newWidth) {
 	auto newHeight = minHeight();
 
 	if (const auto service = Get<ServicePreMessage>()) {
-		service->resizeToWidth(newWidth, delegate()->elementIsChatWide());
+		service->resizeToWidth(newWidth, delegate()->elementChatMode());
 	}
 
 	const auto botTop = item->isFakeAboutView()
@@ -4515,9 +4517,14 @@ int Message::resizeContentGetHeight(int newWidth) {
 	// This code duplicates countGeometry() but also resizes media.
 	const auto centeredView = item->isFakeAboutView()
 		|| (context() == Context::Replies && item->isDiscussionPost());
+	const auto useMoreSpace = (delegate()->elementChatMode()
+		== ElementChatMode::Narrow);
+	const auto wideSkip = useMoreSpace
+		? st::msgMargin.left()
+		: st::msgMargin.right();
 	auto contentWidth = newWidth
 		- st::msgMargin.left()
-		- (centeredView ? st::msgMargin.left() : st::msgMargin.right());
+		- (centeredView ? st::msgMargin.left() : wideSkip);
 	if (hasFromPhoto()) {
 		if (const auto size = rightActionSize()) {
 			contentWidth -= size->width() + (st::msgPhotoSkip - st::historyFastShareSize);

Telegram/SourceFiles/history/view/history_view_service_message.cpp

@@ -423,7 +423,7 @@ bool Service::consumeHorizontalScroll(QPoint position, int delta) {
 
 QRect Service::countGeometry() const {
 	auto result = QRect(0, 0, width(), height());
-	if (delegate()->elementIsChatWide()) {
+	if (delegate()->elementChatMode() == ElementChatMode::Wide) {
 		result.setWidth(qMin(result.width(), st::msgMaxWidth + 2 * st::msgPhotoSkip + 2 * st::msgMargin.left()));
 	}
 	auto margins = st::msgServiceMargin;
@@ -469,7 +469,7 @@ QSize Service::performCountCurrentSize(int newWidth) {
 			+ media->resizeGetHeight(newWidth)
 			+ st::msgServiceMargin.bottom();
 	} else if (!text().isEmpty()) {
-		if (delegate()->elementIsChatWide()) {
+		if (delegate()->elementChatMode() == ElementChatMode::Wide) {
 			accumulate_min(contentWidth, st::msgMaxWidth + 2 * st::msgPhotoSkip + 2 * st::msgMargin.left());
 		}
 		contentWidth -= st::msgServiceMargin.left() + st::msgServiceMargin.left(); // two small margins
@@ -561,7 +561,7 @@ void Service::draw(Painter &p, const PaintContext &context) const {
 				context,
 				0,
 				width(),
-				delegate()->elementIsChatWide());
+				delegate()->elementChatMode());
 			p.translate(0, -aboveh);
 		}
 	}

Telegram/SourceFiles/history/view/history_view_subsection_tabs.cpp

@@ -0,0 +1,384 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "history/view/history_view_subsection_tabs.h"
+
+#include "core/ui_integration.h"
+#include "data/stickers/data_custom_emoji.h"
+#include "data/data_channel.h"
+#include "data/data_forum.h"
+#include "data/data_forum_topic.h"
+#include "data/data_saved_messages.h"
+#include "data/data_saved_sublist.h"
+#include "data/data_session.h"
+#include "data/data_thread.h"
+#include "dialogs/dialogs_main_list.h"
+#include "history/history.h"
+#include "lang/lang_keys.h"
+#include "ui/text/text_utilities.h"
+#include "ui/widgets/buttons.h"
+#include "ui/widgets/discrete_sliders.h"
+#include "ui/widgets/scroll_area.h"
+#include "ui/widgets/shadow.h"
+#include "window/window_session_controller.h"
+#include "styles/style_chat.h"
+
+namespace HistoryView {
+namespace {
+
+constexpr auto kDefaultLimit = 10;
+
+} // namespace
+
+SubsectionTabs::SubsectionTabs(
+	not_null<Window::SessionController*> controller,
+	not_null<Ui::RpWidget*> parent,
+	not_null<Data::Thread*> thread)
+: _controller(controller)
+, _history(thread->owningHistory())
+, _active(thread)
+, _around(thread)
+, _beforeLimit(kDefaultLimit)
+, _afterLimit(kDefaultLimit) {
+	track();
+	refreshSlice();
+	setupHorizontal(parent);
+}
+
+SubsectionTabs::~SubsectionTabs() {
+	delete base::take(_horizontal);
+	delete base::take(_vertical);
+	delete base::take(_shadow);
+}
+
+void SubsectionTabs::setupHorizontal(not_null<QWidget*> parent) {
+	delete base::take(_vertical);
+	_horizontal = Ui::CreateChild<Ui::RpWidget>(parent);
+	_horizontal->show();
+
+	if (!_shadow) {
+		_shadow = Ui::CreateChild<Ui::PlainShadow>(parent);
+		_shadow->show();
+	}
+
+	const auto toggle = Ui::CreateChild<Ui::IconButton>(
+		_horizontal,
+		st::chatTabsToggle);
+	toggle->show();
+	toggle->setClickedCallback([=] {
+		toggleModes();
+	});
+	toggle->move(0, 0);
+	const auto scroll = Ui::CreateChild<Ui::ScrollArea>(
+		_horizontal,
+		st::chatTabsScroll,
+		true);
+	scroll->show();
+	const auto tabs = scroll->setOwnedWidget(
+		object_ptr<Ui::SettingsSlider>(scroll, st::chatTabsSlider));
+	tabs->sectionActivated() | rpl::start_with_next([=](int active) {
+		if (active >= 0
+			&& active < _slice.size()
+			&& _active != _slice[active]) {
+			auto params = Window::SectionShow();
+			params.way = Window::SectionShow::Way::ClearStack;
+			params.animated = anim::type::instant;
+			_controller->showThread(_slice[active], {}, params);
+		}
+	}, tabs->lifetime());
+
+	_horizontal->sizeValue(
+	) | rpl::start_with_next([=](QSize size) {
+		const auto togglew = toggle->width();
+		const auto height = size.height();
+		scroll->setGeometry(togglew, 0, size.width() - togglew, height);
+	}, scroll->lifetime());
+
+	_horizontal->paintRequest() | rpl::start_with_next([=](QRect clip) {
+		QPainter(_horizontal).fillRect(clip, st::windowBg);
+	}, _horizontal->lifetime());
+
+	_refreshed.events_starting_with_copy(
+		rpl::empty
+	) | rpl::start_with_next([=] {
+		auto sections = std::vector<TextWithEntities>();
+		const auto manager = &_history->owner().customEmojiManager();
+		auto activeIndex = -1;
+		for (const auto &thread : _slice) {
+			if (thread == _active) {
+				activeIndex = int(sections.size());
+			}
+			if (const auto topic = thread->asTopic()) {
+				sections.push_back(topic->titleWithIcon());
+			} else if (const auto sublist = thread->asSublist()) {
+				const auto peer = sublist->sublistPeer();
+				sections.push_back(TextWithEntities().append(
+					Ui::Text::SingleCustomEmoji(
+						manager->peerUserpicEmojiData(peer),
+						u"@"_q)
+				).append(' ').append(peer->shortName()));
+			} else {
+				sections.push_back(tr::lng_filters_all_short(
+					tr::now,
+					Ui::Text::WithEntities));
+			}
+		}
+		tabs->setSections(sections, Core::TextContext({
+			.session = &_history->session(),
+		}));
+		tabs->fitWidthToSections();
+		tabs->setActiveSectionFast(activeIndex);
+		_horizontal->resize(
+			tabs->width(),
+			std::max(toggle->height(), tabs->height()));
+	}, _horizontal->lifetime());
+}
+
+void SubsectionTabs::setupVertical(not_null<QWidget*> parent) {
+	delete base::take(_horizontal);
+	_vertical = Ui::CreateChild<Ui::RpWidget>(parent);
+	_vertical->show();
+
+	if (!_shadow) {
+		_shadow = Ui::CreateChild<Ui::PlainShadow>(parent);
+		_shadow->show();
+	}
+
+	const auto toggle = Ui::CreateChild<Ui::IconButton>(
+		_vertical,
+		st::chatTabsToggle);
+	toggle->show();
+	const auto active = &st::chatTabsToggleActive;
+	toggle->setIconOverride(active, active);
+	toggle->setClickedCallback([=] {
+		toggleModes();
+	});
+	toggle->move(0, 0);
+	const auto scroll = Ui::CreateChild<Ui::ScrollArea>(_vertical);
+	scroll->show();
+
+	_vertical->sizeValue(
+	) | rpl::start_with_next([=](QSize size) {
+		const auto toggleh = toggle->height();
+		const auto width = size.width();
+		scroll->setGeometry(0, toggleh, width, size.height() - toggleh);
+	}, scroll->lifetime());
+
+	_vertical->paintRequest() | rpl::start_with_next([=](QRect clip) {
+		QPainter(_vertical).fillRect(clip, st::windowBg);
+	}, _vertical->lifetime());
+
+	_refreshed.events_starting_with_copy(
+		rpl::empty
+	) | rpl::start_with_next([=] {
+		_vertical->resize(std::max(toggle->width(), 0), 0);
+	}, _vertical->lifetime());
+}
+
+void SubsectionTabs::toggleModes() {
+	Expects((_horizontal || _vertical) && _shadow);
+
+	if (_horizontal) {
+		setupVertical(_horizontal->parentWidget());
+	} else {
+		setupHorizontal(_vertical->parentWidget());
+	}
+	_layoutRequests.fire({});
+}
+
+rpl::producer<> SubsectionTabs::removeRequests() const {
+	if (const auto forum = _history->peer->forum()) {
+		return forum->destroyed();
+	} else if (const auto monoforum = _history->peer->monoforum()) {
+		return monoforum->destroyed();
+	} else {
+		Unexpected("Peer in SubsectionTabs::removeRequests.");
+	}
+}
+
+void SubsectionTabs::extractToParent(not_null<Ui::RpWidget*> parent) {
+	Expects((_horizontal || _vertical) && _shadow);
+
+	if (_vertical) {
+		_vertical->hide();
+		_vertical->setParent(parent);
+	} else {
+		_horizontal->hide();
+		_horizontal->setParent(parent);
+	}
+	_shadow->hide();
+	_shadow->setParent(parent);
+}
+
+void SubsectionTabs::setBoundingRect(QRect boundingRect) {
+	Expects((_horizontal || _vertical) && _shadow);
+
+	if (_horizontal) {
+		_horizontal->setGeometry(
+			boundingRect.x(),
+			boundingRect.y(),
+			boundingRect.width(),
+			_horizontal->height());
+		_shadow->setGeometry(
+			boundingRect.x(),
+			_horizontal->y() + _horizontal->height(),
+			boundingRect.width(),
+			st::lineWidth);
+	} else {
+		_vertical->setGeometry(
+			boundingRect.x(),
+			boundingRect.y(),
+			_vertical->width(),
+			boundingRect.height());
+		_shadow->setGeometry(
+			_vertical->x() + _vertical->width(),
+			boundingRect.y(),
+			st::lineWidth,
+			boundingRect.height());
+	}
+}
+
+rpl::producer<> SubsectionTabs::layoutRequests() const {
+	return _layoutRequests.events();
+}
+
+int SubsectionTabs::leftSkip() const {
+	return _vertical ? _vertical->width() : 0;
+}
+
+int SubsectionTabs::topSkip() const {
+	return _horizontal ? _horizontal->height() : 0;
+}
+
+void SubsectionTabs::raise() {
+	Expects((_horizontal || _vertical) && _shadow);
+
+	if (_horizontal) {
+		_horizontal->raise();
+	} else {
+		_vertical->raise();
+	}
+	_shadow->raise();
+}
+
+void SubsectionTabs::show() {
+	setVisible(true);
+}
+
+void SubsectionTabs::hide() {
+	setVisible(false);
+}
+
+void SubsectionTabs::setVisible(bool shown) {
+	Expects((_horizontal || _vertical) && _shadow);
+
+	if (_horizontal) {
+		_horizontal->setVisible(shown);
+	} else {
+		_vertical->setVisible(shown);
+	}
+	_shadow->setVisible(shown);
+}
+
+void SubsectionTabs::track() {
+	if (const auto forum = _history->peer->forum()) {
+		forum->topicDestroyed(
+		) | rpl::start_with_next([=](not_null<Data::ForumTopic*> topic) {
+			if (_around == topic) {
+				_around = _history;
+				refreshSlice();
+			}
+		}, _lifetime);
+	} else if (const auto monoforum = _history->peer->monoforum()) {
+		monoforum->sublistDestroyed(
+		) | rpl::start_with_next([=](not_null<Data::SavedSublist*> sublist) {
+			if (_around == sublist) {
+				_around = _history;
+				refreshSlice();
+			}
+		}, _lifetime);
+	} else {
+		Unexpected("Peer in SubsectionTabs::track.");
+	}
+}
+
+void SubsectionTabs::refreshSlice() {
+	const auto forum = _history->peer->forum();
+	const auto monoforum = _history->peer->monoforum();
+	Assert(forum || monoforum);
+
+	const auto list = forum
+		? forum->topicsList()
+		: monoforum->chatsList();
+	auto slice = std::vector<not_null<Data::Thread*>>();
+	const auto guard = gsl::finally([&] {
+		if (_slice != slice) {
+			_slice = std::move(slice);
+			_refreshed.fire({});
+		}
+	});
+	if (!list) {
+		slice.push_back(_history);
+		return;
+	}
+	const auto &chats = list->indexed()->all();
+	auto i = (_around == _history)
+		? chats.end()
+		: ranges::find(chats, _around, [](not_null<Dialogs::Row*> row) {
+			return not_null(row->thread());
+		});
+	if (i == chats.end()) {
+		i = chats.begin();
+	}
+	const auto takeBefore = std::min(_beforeLimit, int(i - chats.begin()));
+	const auto takeAfter = std::min(_afterLimit, int(chats.end() - i));
+	const auto from = i - takeBefore;
+	const auto till = i + takeAfter;
+	_beforeSkipped = std::max(0, int(from - chats.begin()));
+	_afterSkipped = list->loaded()
+		? std::max(0, int(chats.end() - till))
+		: std::optional<int>();
+	if (from == chats.begin()) {
+		slice.push_back(_history);
+	}
+	for (auto i = from; i != till; ++i) {
+		slice.push_back((*i)->thread());
+	}
+}
+
+bool SubsectionTabs::switchTo(
+		not_null<Data::Thread*> thread,
+		not_null<Ui::RpWidget*> parent) {
+	Expects((_horizontal || _vertical) && _shadow);
+
+	if (thread->owningHistory() != _history) {
+		return false;
+	}
+	if (_vertical) {
+		_vertical->setParent(parent);
+		_vertical->show();
+	} else {
+		_horizontal->setParent(parent);
+		_horizontal->show();
+	}
+	_shadow->setParent(parent);
+	_shadow->show();
+	return true;
+}
+
+bool SubsectionTabs::UsedFor(not_null<Data::Thread*> thread) {
+	const auto history = thread->owningHistory();
+	if (history->amMonoforumAdmin()) {
+		return true;
+	}
+	const auto channel = history->peer->asChannel();
+	return channel
+		&& channel->isForum()
+		&& ((channel->flags() & ChannelDataFlag::ForumTabs) || true); AssertIsDebug();
+}
+
+} // namespace HistoryView

Telegram/SourceFiles/history/view/history_view_subsection_tabs.h

@@ -0,0 +1,84 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+class History;
+
+namespace Data {
+class Thread;
+} // namespace Data
+
+namespace Window {
+class SessionController;
+} // namespace Window
+
+namespace Ui {
+class RpWidget;
+} // namespace Ui
+
+namespace HistoryView {
+
+class SubsectionTabs final {
+public:
+	SubsectionTabs(
+		not_null<Window::SessionController*> controller,
+		not_null<Ui::RpWidget*> parent,
+		not_null<Data::Thread*> thread);
+	~SubsectionTabs();
+
+	[[nodiscard]] bool switchTo(
+		not_null<Data::Thread*> thread,
+		not_null<Ui::RpWidget*> parent);
+
+	[[nodiscard]] static bool UsedFor(not_null<Data::Thread*> thread);
+
+	[[nodiscard]] rpl::producer<> removeRequests() const;
+
+	void extractToParent(not_null<Ui::RpWidget*> parent);
+
+	void setBoundingRect(QRect boundingRect);
+	[[nodiscard]] rpl::producer<> layoutRequests() const;
+	[[nodiscard]] int leftSkip() const;
+	[[nodiscard]] int topSkip() const;
+
+	void raise();
+	void show();
+	void hide();
+
+private:
+	void track();
+	void setupHorizontal(not_null<QWidget*> parent);
+	void setupVertical(not_null<QWidget*> parent);
+	void toggleModes();
+	void setVisible(bool shown);
+	void refreshSlice();
+
+	const not_null<Window::SessionController*> _controller;
+	const not_null<History*> _history;
+
+	Ui::RpWidget *_horizontal = nullptr;
+	Ui::RpWidget *_vertical = nullptr;
+	Ui::RpWidget *_shadow = nullptr;
+
+	std::vector<not_null<Data::Thread*>> _slice;
+
+	not_null<Data::Thread*> _active;
+	not_null<Data::Thread*> _around;
+	int _beforeLimit = 0;
+	int _afterLimit = 0;
+	std::optional<int> _beforeSkipped;
+	std::optional<int> _afterSkipped;
+
+	rpl::event_stream<> _layoutRequests;
+	rpl::event_stream<> _refreshed;
+
+	rpl::lifetime _lifetime;
+
+};
+
+} // namespace HistoryView

Telegram/SourceFiles/info/profile/info_profile_actions.cpp

@@ -2193,9 +2193,10 @@ Ui::MultiSlideTracker DetailsFiller::fillChannelButtons(
 	}) | rpl::distinct_until_changed();
 	auto viewDirect = [=] {
 		if (const auto linked = channel->monoforumLink()) {
-			if (const auto monoforum = linked->monoforum()) {
-				window->showMonoforum(monoforum);
-			}
+			window->showPeerHistory(linked);
+			//if (const auto monoforum = linked->monoforum()) {
+			//	window->showMonoforum(monoforum);
+			//}
 		}
 	};
 	AddMainButton( // #TODO monoforum

Telegram/SourceFiles/mainwidget.cpp

@@ -1516,7 +1516,7 @@ void MainWidget::showHistory(
 						: Window::SlideDirection::FromRight,
 					animationParams);
 			} else {
-				_history->show();
+				_history->showFast();
 				crl::on_main(this, [=] {
 					_controller->widget()->setInnerFocus();
 				});
@@ -1536,6 +1536,8 @@ void MainWidget::showHistory(
 	}
 
 	floatPlayerCheckVisibility();
+
+	controller()->dropSubsectionTabs();
 }
 
 void MainWidget::showMessage(

Telegram/SourceFiles/settings/business/settings_shortcut_messages.cpp

@@ -373,7 +373,7 @@ ShortcutMessages::ShortcutMessages(
 		this,
 		&controller->session(),
 		static_cast<ListDelegate*>(this));
-	_inner->overrideIsChatWide(false);
+	_inner->overrideChatMode(ElementChatMode::Default);
 
 	_scroll->sizeValue() | rpl::filter([](QSize size) {
 		return !size.isEmpty();

Telegram/SourceFiles/ui/chat/chat.style

@@ -1253,3 +1253,34 @@ newPeerUserpicsPadding: margins(0px, 3px, 0px, 0px);
 newPeerWidth: 320px;
 
 swipeBackSize: 150px;
+
+chatTabsToggle: IconButton(defaultIconButton) {
+	width: 56px;
+	height: 36px;
+	icon: icon {{ "top_bar_profile-flip_horizontal", menuIconFg }};
+	iconOver: icon {{ "top_bar_profile-flip_horizontal", menuIconFgOver }};
+	ripple: emptyRippleAnimation;
+}
+chatTabsToggleActive: icon {{ "top_bar_profile-flip_horizontal", windowActiveTextFg }};
+chatTabsScroll: ScrollArea(defaultScrollArea) {
+	barHidden: true;
+}
+chatTabsSlider: SettingsSlider(defaultSettingsSlider) {
+	padding: 0px;
+	height: 36px;
+	barTop: 33px;
+	barSkip: 0px;
+	barStroke: 6px;
+	barRadius: 2px;
+	barFg: transparent;
+	barSnapToLabel: true;
+	strictSkip: 18px;
+	labelTop: 9px;
+	labelStyle: semiboldTextStyle;
+	labelFg: windowSubTextFg;
+	labelFgActive: lightButtonFg;
+	rippleBottomSkip: 1px;
+	rippleBg: windowBgOver;
+	rippleBgActive: lightButtonBgOver;
+	ripple: defaultRippleAnimation;
+}

Telegram/SourceFiles/window/section_widget.cpp

@@ -279,6 +279,7 @@ void SectionWidget::setGeometryWithTopMoved(
 void SectionWidget::showAnimated(
 		SlideDirection direction,
 		const SectionSlideParams &params) {
+	validateSubsectionTabs();
 	if (_showAnimation) {
 		return;
 	}
@@ -309,6 +310,7 @@ std::shared_ptr<SectionMemento> SectionWidget::createMemento() {
 }
 
 void SectionWidget::showFast() {
+	validateSubsectionTabs();
 	show();
 	showFinished();
 }

Telegram/SourceFiles/window/section_widget.h

@@ -194,6 +194,9 @@ public:
 		return nullptr;
 	}
 
+	virtual void validateSubsectionTabs() {
+	}
+
 	static void PaintBackground(
 		not_null<SessionController*> controller,
 		not_null<Ui::ChatTheme*> theme,

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -27,6 +27,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 //#include "history/view/reactions/history_view_reactions_button.h"
 #include "history/view/history_view_chat_section.h"
 #include "history/view/history_view_scheduled_section.h"
+#include "history/view/history_view_subsection_tabs.h"
 #include "media/player/media_player_instance.h"
 #include "media/view/media_view_open_common.h"
 #include "data/stickers/data_custom_emoji.h"
@@ -3440,8 +3441,37 @@ std::shared_ptr<ChatHelpers::Show> SessionController::uiShow() {
 	return _cachedShow;
 }
 
+void SessionController::saveSubsectionTabs(
+		std::unique_ptr<HistoryView::SubsectionTabs> tabs) {
+	_savedSubsectionTabsLifetime.destroy();
+	_savedSubsectionTabs = std::move(tabs);
+	_savedSubsectionTabs->extractToParent(widget());
+	_savedSubsectionTabs->removeRequests() | rpl::start_with_next([=] {
+		_savedSubsectionTabs = nullptr;
+	}, _savedSubsectionTabsLifetime);
+}
+
+auto SessionController::restoreSubsectionTabsFor(
+	not_null<Ui::RpWidget*> parent,
+	not_null<Data::Thread*> thread)
+-> std::unique_ptr<HistoryView::SubsectionTabs> {
+	if (!_savedSubsectionTabs) {
+		return nullptr;
+	} else if (_savedSubsectionTabs->switchTo(thread, parent)) {
+		_savedSubsectionTabsLifetime.destroy();
+		return base::take(_savedSubsectionTabs);
+	}
+	return nullptr;
+}
+
+void SessionController::dropSubsectionTabs() {
+	_savedSubsectionTabsLifetime.destroy();
+	base::take(_savedSubsectionTabs);
+}
+
 SessionController::~SessionController() {
 	resetFakeUnreadWhileOpened();
+	dropSubsectionTabs();
 }
 
 bool CheckAndJumpToNearChatsFilter(

Telegram/SourceFiles/window/window_session_controller.h

@@ -78,6 +78,10 @@ class SavedSublist;
 class WallPaper;
 } // namespace Data
 
+namespace HistoryView {
+class SubsectionTabs;
+} // namespace HistoryView
+
 namespace HistoryView::Reactions {
 class CachedIconFactory;
 } // namespace HistoryView::Reactions
@@ -659,6 +663,14 @@ public:
 
 	[[nodiscard]] std::shared_ptr<ChatHelpers::Show> uiShow() override;
 
+	void saveSubsectionTabs(
+		std::unique_ptr<HistoryView::SubsectionTabs> tabs);
+	[[nodiscard]] auto restoreSubsectionTabsFor(
+		not_null<Ui::RpWidget*> parent,
+		not_null<Data::Thread*> thread)
+		-> std::unique_ptr<HistoryView::SubsectionTabs>;
+	void dropSubsectionTabs();
+
 	[[nodiscard]] rpl::lifetime &lifetime() {
 		return _lifetime;
 	}
@@ -774,6 +786,8 @@ private:
 	base::has_weak_ptr _storyOpenGuard;
 
 	QString _premiumRef;
+	std::unique_ptr<HistoryView::SubsectionTabs> _savedSubsectionTabs;
+	rpl::lifetime _savedSubsectionTabsLifetime;
 
 	rpl::lifetime _lifetime;