diff --git a/Telegram/SourceFiles/apiwrap.cpp b/Telegram/SourceFiles/apiwrap.cpp
index 4dc9a726c7..577d0b995e 100644
--- a/Telegram/SourceFiles/apiwrap.cpp
+++ b/Telegram/SourceFiles/apiwrap.cpp
@@ -3412,7 +3412,7 @@ void ApiWrap::jumpToHistoryDate(not_null<PeerData*> peer, const QDate &date) {
 //	requestMessageAfterDate(feed, date, [=](Data::MessagePosition result) {
 //		Ui::hideLayer();
 //		App::wnd()->sessionController()->showSection(
-//			HistoryFeed::Memento(feed, result));
+//			std::make_unique<HistoryFeed::Memento>(feed, result));
 //	});
 //}
 
diff --git a/Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp b/Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp
index 0b0801f486..a4df0596a0 100644
--- a/Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp
+++ b/Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp
@@ -1000,13 +1000,15 @@ void Controller::fillManageSection() {
 			st::infoIconBlacklist);
 	}
 	if (hasRecentActions) {
+		auto callback = [=] {
+			_navigation->showSection(
+				std::make_unique<AdminLog::SectionMemento>(channel));
+		};
 		AddButtonWithCount(
 			_controls.buttonsLayout,
 			tr::lng_manage_peer_recent_actions(),
 			rpl::single(QString()), //Empty count.
-			[=] {
-				_navigation->showSection(AdminLog::SectionMemento(channel));
-			},
+			std::move(callback),
 			st::infoIconRecentActions);
 	}
 
diff --git a/Telegram/SourceFiles/core/update_checker.cpp b/Telegram/SourceFiles/core/update_checker.cpp
index 79320c9e1f..4863ea4cec 100644
--- a/Telegram/SourceFiles/core/update_checker.cpp
+++ b/Telegram/SourceFiles/core/update_checker.cpp
@@ -1591,7 +1591,7 @@ void UpdateApplication() {
 		if (const auto window = App::wnd()) {
 			if (const auto controller = window->sessionController()) {
 				controller->showSection(
-					Info::Memento(
+					std::make_unique<Info::Memento>(
 						Info::Settings::Tag{ controller->session().user() },
 						Info::Section::SettingsType::Advanced),
 					Window::SectionShow());
diff --git a/Telegram/SourceFiles/data/data_shared_media.cpp b/Telegram/SourceFiles/data/data_shared_media.cpp
index 8497ce8f79..9c988dd3bf 100644
--- a/Telegram/SourceFiles/data/data_shared_media.cpp
+++ b/Telegram/SourceFiles/data/data_shared_media.cpp
@@ -56,7 +56,7 @@ void SharedMediaShowOverview(
 				return;
 			}
 		}
-		windows.front()->showSection(Info::Memento(
+		windows.front()->showSection(std::make_unique<Info::Memento>(
 			history->peer,
 			Info::Section(type)));
 	}
diff --git a/Telegram/SourceFiles/dialogs/dialogs_widget.cpp b/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
index fd08fb769e..ecd92806d1 100644
--- a/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
+++ b/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
@@ -1776,7 +1776,7 @@ bool Widget::onCancelSearch() {
 			if (const auto peer = _searchInChat.peer()) {
 				Ui::showPeerHistory(peer, ShowAtUnreadMsgId);
 			//} else if (const auto feed = _searchInChat.feed()) { // #feed
-			//	controller()->showSection(HistoryFeed::Memento(feed));
+			//	controller()->showSection(std::make_unique<HistoryFeed::Memento>(feed));
 			} else {
 				Unexpected("Empty key in onCancelSearch().");
 			}
@@ -1800,7 +1800,7 @@ void Widget::onCancelSearchInChat() {
 			if (const auto peer = _searchInChat.peer()) {
 				Ui::showPeerHistory(peer, ShowAtUnreadMsgId);
 			//} else if (const auto feed = _searchInChat.feed()) { // #feed
-			//	controller()->showSection(HistoryFeed::Memento(feed));
+			//	controller()->showSection(std::make_unique<HistoryFeed::Memento>(feed));
 			} else {
 				Unexpected("Empty key in onCancelSearchInPeer().");
 			}
diff --git a/Telegram/SourceFiles/history/history_widget.cpp b/Telegram/SourceFiles/history/history_widget.cpp
index eca6160eae..10e3a9064c 100644
--- a/Telegram/SourceFiles/history/history_widget.cpp
+++ b/Telegram/SourceFiles/history/history_widget.cpp
@@ -687,7 +687,7 @@ HistoryWidget::HistoryWidget(
 			cancelReply(lastKeyboardUsed);
 			crl::on_main(this, [=, history = action.history]{
 				controller->showSection(
-					HistoryView::ScheduledMemento(history));
+					std::make_unique<HistoryView::ScheduledMemento>(history));
 			});
 		} else {
 			fastShowAtEnd(action.history);
@@ -1505,7 +1505,7 @@ bool HistoryWidget::notify_switchInlineBotButtonReceived(const QString &query, U
 		} else if (to.section == Section::Scheduled) {
 			history->setDraft(Data::DraftKey::Scheduled(), std::move(draft));
 			controller()->showSection(
-				HistoryView::ScheduledMemento(history));
+				std::make_unique<HistoryView::ScheduledMemento>(history));
 		} else {
 			history->setLocalDraft(std::move(draft));
 			if (history == _history) {
@@ -2073,7 +2073,7 @@ void HistoryWidget::refreshScheduledToggle() {
 		_scheduled->show();
 		_scheduled->addClickHandler([=] {
 			controller()->showSection(
-				HistoryView::ScheduledMemento(_history));
+				std::make_unique<HistoryView::ScheduledMemento>(_history));
 		});
 		orderWidgets(); // Raise drag areas to the top.
 	} else if (_scheduled && !has) {
@@ -3883,7 +3883,7 @@ bool HistoryWidget::pushTabbedSelectorToThirdSection(
 	Core::App().settings().setTabbedReplacedWithInfo(false);
 	controller()->resizeForThirdSection();
 	controller()->showSection(
-		ChatHelpers::TabbedMemento(),
+		std::make_unique<ChatHelpers::TabbedMemento>(),
 		params.withThirdColumn());
 	return true;
 }
@@ -5382,7 +5382,7 @@ void HistoryWidget::refreshPinnedBarButton(bool many) {
 			const auto id = _pinnedTracker->currentMessageId();
 			if (id.message) {
 				controller()->showSection(
-					HistoryView::PinnedMemento(
+					std::make_unique<HistoryView::PinnedMemento>(
 						_history,
 						((!_migrated || id.message.channel)
 							? id.message.msg
diff --git a/Telegram/SourceFiles/history/view/controls/history_view_compose_controls.cpp b/Telegram/SourceFiles/history/view/controls/history_view_compose_controls.cpp
index 3bea246b34..c848c00d7a 100644
--- a/Telegram/SourceFiles/history/view/controls/history_view_compose_controls.cpp
+++ b/Telegram/SourceFiles/history/view/controls/history_view_compose_controls.cpp
@@ -1736,7 +1736,7 @@ bool ComposeControls::pushTabbedSelectorToThirdSection(
 		&st::historyRecordVoiceRippleBgActive);
 	_window->resizeForThirdSection();
 	_window->showSection(
-		ChatHelpers::TabbedMemento(),
+		std::make_unique<ChatHelpers::TabbedMemento>(),
 		params.withThirdColumn());
 	return true;
 }
diff --git a/Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp b/Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp
index ebadf71335..4c74a042cb 100644
--- a/Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp
+++ b/Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp
@@ -493,15 +493,15 @@ void TopBarWidget::infoClicked() {
 	} else if (key.folder()) {
 		_controller->closeFolder();
 	//} else if (const auto feed = _activeChat.feed()) { // #feed
-	//	_controller->showSection(Info::Memento(
+	//	_controller->showSection(std::make_unique<Info::Memento>(
 	//		feed,
 	//		Info::Section(Info::Section::Type::Profile)));
 	} else if (key.peer()->isSelf()) {
-		_controller->showSection(Info::Memento(
+		_controller->showSection(std::make_unique<Info::Memento>(
 			key.peer(),
 			Info::Section(Storage::SharedMediaType::Photo)));
 	} else if (key.peer()->isRepliesChat()) {
-		_controller->showSection(Info::Memento(
+		_controller->showSection(std::make_unique<Info::Memento>(
 			key.peer(),
 			Info::Section(Storage::SharedMediaType::Photo)));
 	} else {
diff --git a/Telegram/SourceFiles/info/feed/info_feed_channels.cpp b/Telegram/SourceFiles/info/feed/info_feed_channels.cpp
index ee1acb7537..0d636df826 100644
--- a/Telegram/SourceFiles/info/feed/info_feed_channels.cpp
+++ b/Telegram/SourceFiles/info/feed/info_feed_channels.cpp
@@ -281,7 +281,7 @@ void Channels::showChannelsWithSearch(bool withSearch) {
 	auto mementoStack = std::vector<std::unique_ptr<ContentMemento>>();
 	mementoStack.push_back(std::move(contentMemento));
 	_controller->showSection(
-		Info::Memento(std::move(mementoStack)));
+		std::make_unique<Info::Memento>(std::move(mementoStack)));
 }
 
 void Channels::visibleTopBottomUpdated(
diff --git a/Telegram/SourceFiles/info/feed/info_feed_cover.cpp b/Telegram/SourceFiles/info/feed/info_feed_cover.cpp
index fea34f5705..1ec2be9e8a 100644
--- a/Telegram/SourceFiles/info/feed/info_feed_cover.cpp
+++ b/Telegram/SourceFiles/info/feed/info_feed_cover.cpp
@@ -84,7 +84,7 @@ void Cover::refreshStatusText() {
 	}();
 	_status->setRichText(textcmdLink(1, statusText));
 	_status->setLink(1, std::make_shared<LambdaClickHandler>([=] {
-		_controller->showSection(Info::Memento(
+		_controller->showSection(std::make_unique<Info::Memento>(
 			_feed,
 			Section::Type::Channels));
 	}));
diff --git a/Telegram/SourceFiles/info/info_controller.cpp b/Telegram/SourceFiles/info/info_controller.cpp
index 9def98def0..b7ff86b31f 100644
--- a/Telegram/SourceFiles/info/info_controller.cpp
+++ b/Telegram/SourceFiles/info/info_controller.cpp
@@ -123,7 +123,7 @@ PollData *AbstractController::poll() const {
 }
 
 void AbstractController::showSection(
-		Window::SectionMemento &&memento,
+		std::unique_ptr<Window::SectionMemento> &&memento,
 		const Window::SectionShow &params) {
 	return parentController()->showSection(std::move(memento), params);
 }
@@ -170,7 +170,7 @@ void Controller::setupMigrationViewer() {
 		const auto section = _section;
 		InvokeQueued(_widget, [=] {
 			window->showSection(
-				Memento(peer, section),
+				std::make_unique<Memento>(peer, section),
 				Window::SectionShow(
 					Window::SectionShow::Way::Backward,
 					anim::type::instant,
@@ -261,9 +261,9 @@ void Controller::saveSearchState(not_null<ContentMemento*> memento) {
 }
 
 void Controller::showSection(
-		Window::SectionMemento &&memento,
+		std::unique_ptr<Window::SectionMemento> &&memento,
 		const Window::SectionShow &params) {
-	if (!_widget->showInternal(&memento, params)) {
+	if (!_widget->showInternal(memento.get(), params)) {
 		AbstractController::showSection(std::move(memento), params);
 	}
 }
diff --git a/Telegram/SourceFiles/info/info_controller.h b/Telegram/SourceFiles/info/info_controller.h
index c0f117efe5..44926fbeef 100644
--- a/Telegram/SourceFiles/info/info_controller.h
+++ b/Telegram/SourceFiles/info/info_controller.h
@@ -136,7 +136,7 @@ public:
 	virtual rpl::producer<QString> mediaSourceQueryValue() const;
 
 	void showSection(
-		Window::SectionMemento &&memento,
+		std::unique_ptr<Window::SectionMemento> &&memento,
 		const Window::SectionShow &params = Window::SectionShow()) override;
 	void showBackFromStack(
 		const Window::SectionShow &params = Window::SectionShow()) override;
@@ -202,7 +202,7 @@ public:
 	void saveSearchState(not_null<ContentMemento*> memento);
 
 	void showSection(
-		Window::SectionMemento &&memento,
+		std::unique_ptr<Window::SectionMemento> &&memento,
 		const Window::SectionShow &params = Window::SectionShow()) override;
 	void showBackFromStack(
 		const Window::SectionShow &params = Window::SectionShow()) override;
diff --git a/Telegram/SourceFiles/info/info_layer_widget.cpp b/Telegram/SourceFiles/info/info_layer_widget.cpp
index 1627b1383f..9460b7f05f 100644
--- a/Telegram/SourceFiles/info/info_layer_widget.cpp
+++ b/Telegram/SourceFiles/info/info_layer_widget.cpp
@@ -106,7 +106,7 @@ void LayerWidget::parentResized() {
 		Ui::FocusPersister persister(this);
 		restoreFloatPlayerDelegate();
 
-		auto memento = MoveMemento(std::move(_content));
+		auto memento = std::make_unique<MoveMemento>(std::move(_content));
 
 		// We want to call hideSpecialLayer synchronously to avoid glitches,
 		// but we can't destroy LayerStackWidget from its' resizeEvent,
diff --git a/Telegram/SourceFiles/info/info_memento.cpp b/Telegram/SourceFiles/info/info_memento.cpp
index 8f32c15782..ba15952f5f 100644
--- a/Telegram/SourceFiles/info/info_memento.cpp
+++ b/Telegram/SourceFiles/info/info_memento.cpp
@@ -101,8 +101,8 @@ Section Memento::DefaultSection(not_null<PeerData*> peer) {
 //	return Section(Section::Type::Profile);
 //}
 
-Memento Memento::Default(not_null<PeerData*> peer) {
-	return Memento(peer, DefaultSection(peer));
+std::unique_ptr<Memento> Memento::Default(not_null<PeerData*> peer) {
+	return std::make_unique<Memento>(peer, DefaultSection(peer));
 }
 // // #feed
 //Memento Memento::Default(Dialogs::Key key) {
diff --git a/Telegram/SourceFiles/info/info_memento.h b/Telegram/SourceFiles/info/info_memento.h
index c317116cb4..bcd9b6aac8 100644
--- a/Telegram/SourceFiles/info/info_memento.h
+++ b/Telegram/SourceFiles/info/info_memento.h
@@ -62,7 +62,7 @@ public:
 
 	static Section DefaultSection(not_null<PeerData*> peer);
 	//static Section DefaultSection(Dialogs::Key key); // #feed
-	static Memento Default(not_null<PeerData*> peer);
+	static std::unique_ptr<Memento> Default(not_null<PeerData*> peer);
 	//static Memento Default(Dialogs::Key key); // #feed
 
 	~Memento();
diff --git a/Telegram/SourceFiles/info/media/info_media_buttons.h b/Telegram/SourceFiles/info/media/info_media_buttons.h
index eaf2154ade..78e199c023 100644
--- a/Telegram/SourceFiles/info/media/info_media_buttons.h
+++ b/Telegram/SourceFiles/info/media/info_media_buttons.h
@@ -92,7 +92,7 @@ inline auto AddButton(
 		tracker)->entity();
 	result->addClickHandler([=] {
 		navigation->showSection(
-			Info::Memento(peer, Section(type)));
+			std::make_unique<Info::Memento>(peer, Section(type)));
 	});
 	return result;
 };
@@ -111,7 +111,7 @@ inline auto AddCommonGroupsButton(
 		tracker)->entity();
 	result->addClickHandler([=] {
 		navigation->showSection(
-			Info::Memento(user, Section::Type::CommonGroups));
+			std::make_unique<Info::Memento>(user, Section::Type::CommonGroups));
 	});
 	return result;
 };
diff --git a/Telegram/SourceFiles/info/profile/info_profile_actions.cpp b/Telegram/SourceFiles/info/profile/info_profile_actions.cpp
index 1a0e78b856..1413d3ef86 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_actions.cpp
+++ b/Telegram/SourceFiles/info/profile/info_profile_actions.cpp
@@ -843,7 +843,7 @@ object_ptr<Ui::RpWidget> SetupChannelMembers(
 		lt_count_decimal,
 		MembersCountValue(channel) | tr::to_count());
 	auto membersCallback = [=] {
-		controller->showSection(Info::Memento(
+		controller->showSection(std::make_unique<Info::Memento>(
 			channel,
 			Section::Type::Members));
 	};
diff --git a/Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp b/Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp
index 77e6648b94..e55010909f 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp
+++ b/Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp
@@ -81,7 +81,8 @@ object_ptr<Ui::RpWidget> InnerWidget::setupContent(
 		_controller->parentController()));
 	_cover->showSection(
 	) | rpl::start_with_next([=](Section section) {
-		_controller->showSection(Info::Memento(_peer, section));
+		_controller->showSection(
+			std::make_unique<Info::Memento>(_peer, section));
 	}, _cover->lifetime());
 	_cover->setOnlineCount(rpl::single(0));
 	auto details = SetupDetails(_controller, parent, _peer);
diff --git a/Telegram/SourceFiles/info/profile/info_profile_members.cpp b/Telegram/SourceFiles/info/profile/info_profile_members.cpp
index d95ed2d0b4..0923499d3a 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_members.cpp
+++ b/Telegram/SourceFiles/info/profile/info_profile_members.cpp
@@ -349,7 +349,7 @@ void Members::showMembersWithSearch(bool withSearch) {
 	auto mementoStack = std::vector<std::unique_ptr<ContentMemento>>();
 	mementoStack.push_back(std::move(contentMemento));
 	_controller->showSection(
-		Info::Memento(std::move(mementoStack)));
+		std::make_unique<Info::Memento>(std::move(mementoStack)));
 }
 
 //void Members::toggleSearch(anim::type animated) {
diff --git a/Telegram/SourceFiles/mainwidget.cpp b/Telegram/SourceFiles/mainwidget.cpp
index 6802e12ba3..1d83b39ae9 100644
--- a/Telegram/SourceFiles/mainwidget.cpp
+++ b/Telegram/SourceFiles/mainwidget.cpp
@@ -192,8 +192,8 @@ public:
 	StackItemType type() const override {
 		return SectionStackItem;
 	}
-	Window::SectionMemento *memento() const {
-		return _memento.get();
+	std::unique_ptr<Window::SectionMemento> takeMemento() {
+		return std::move(_memento);
 	}
 
 private:
@@ -1599,10 +1599,10 @@ void MainWidget::saveSectionInStack() {
 }
 
 void MainWidget::showSection(
-		Window::SectionMemento &&memento,
+		std::unique_ptr<Window::SectionMemento> &&memento,
 		const SectionShow &params) {
 	if (_mainSection && _mainSection->showInternal(
-			&memento,
+			memento.get(),
 			params)) {
 		if (const auto entry = _mainSection->activeChat(); entry.key) {
 			_controller->setActiveChatEntry(entry);
@@ -1720,7 +1720,7 @@ Window::SectionSlideParams MainWidget::prepareDialogsAnimation() {
 }
 
 void MainWidget::showNewSection(
-		Window::SectionMemento &&memento,
+		std::unique_ptr<Window::SectionMemento> &&memento,
 		const SectionShow &params) {
 	using Column = Window::Column;
 
@@ -1732,7 +1732,7 @@ void MainWidget::showNewSection(
 		st::columnMinimalWidthThird,
 		height() - thirdSectionTop);
 	auto newThirdSection = (Adaptive::ThreeColumn() && params.thirdColumn)
-		? memento.createWidget(
+		? memento->createWidget(
 			this,
 			_controller,
 			Column::Third,
@@ -1741,7 +1741,7 @@ void MainWidget::showNewSection(
 	const auto layerRect = parentWidget()->rect();
 	if (newThirdSection) {
 		saveInStack = false;
-	} else if (auto layer = memento.createLayer(_controller, layerRect)) {
+	} else if (auto layer = memento->createLayer(_controller, layerRect)) {
 		if (params.activation != anim::activation::background) {
 			Ui::hideLayer(anim::type::instant);
 		}
@@ -1766,7 +1766,7 @@ void MainWidget::showNewSection(
 		height() - mainSectionTop);
 	auto newMainSection = newThirdSection
 		? nullptr
-		: memento.createWidget(
+		: memento->createWidget(
 			this,
 			_controller,
 			Adaptive::OneColumn() ? Column::First : Column::Second,
@@ -1777,7 +1777,7 @@ void MainWidget::showNewSection(
 		if (_a_show.animating()
 			|| Core::App().passcodeLocked()
 			|| (params.animated == anim::type::instant)
-			|| memento.instant()) {
+			|| memento->instant()) {
 			return false;
 		}
 		if (!Adaptive::OneColumn() && params.way == SectionShow::Way::ClearStack) {
@@ -1908,12 +1908,12 @@ void MainWidget::showBackFromStack(
 	} else if (item->type() == SectionStackItem) {
 		auto sectionItem = static_cast<StackItemSection*>(item.get());
 		showNewSection(
-			std::move(*sectionItem->memento()),
+			sectionItem->takeMemento(),
 			params.withWay(SectionShow::Way::Backward));
 	}
 	if (_thirdSectionFromStack && _thirdSection) {
 		_controller->showSection(
-			std::move(*base::take(_thirdSectionFromStack)),
+			base::take(_thirdSectionFromStack),
 			SectionShow(
 				SectionShow::Way::ClearStack,
 				anim::type::instant,
@@ -2455,7 +2455,7 @@ void MainWidget::updateThirdColumnToCurrentChat(
 		}
 
 		_controller->showSection(
-			std::move(*thirdSectionForCurrentMainSection(key)),
+			thirdSectionForCurrentMainSection(key),
 			params.withThirdColumn());
 	};
 	auto switchTabbedFast = [&](not_null<PeerData*> peer) {
diff --git a/Telegram/SourceFiles/mainwidget.h b/Telegram/SourceFiles/mainwidget.h
index 6a1f0e666c..3575dea9ec 100644
--- a/Telegram/SourceFiles/mainwidget.h
+++ b/Telegram/SourceFiles/mainwidget.h
@@ -134,7 +134,7 @@ public:
 
 	int backgroundFromY() const;
 	void showSection(
-		Window::SectionMemento &&memento,
+		std::unique_ptr<Window::SectionMemento> &&memento,
 		const SectionShow &params);
 	void updateColumnLayout();
 	bool stackIsEmpty() const;
@@ -271,7 +271,7 @@ private:
 	Window::SectionSlideParams prepareShowAnimation(
 		bool willHaveTopBarShadow);
 	void showNewSection(
-		Window::SectionMemento &&memento,
+		std::unique_ptr<Window::SectionMemento> &&memento,
 		const SectionShow &params);
 	void dropMainSection(Window::SectionWidget *widget);
 
diff --git a/Telegram/SourceFiles/window/notifications_manager.cpp b/Telegram/SourceFiles/window/notifications_manager.cpp
index e6d7725067..00f822f8e4 100644
--- a/Telegram/SourceFiles/window/notifications_manager.cpp
+++ b/Telegram/SourceFiles/window/notifications_manager.cpp
@@ -650,7 +650,7 @@ void Manager::openNotificationMessage(
 		Ui::showPeerHistory(history, messageId);
 	//} else if (messageFeed) { // #feed
 	//	App::wnd()->sessionController()->showSection(
-	//		HistoryFeed::Memento(messageFeed));
+	//		std::make_unique<HistoryFeed::Memento>(messageFeed));
 	} else {
 		Ui::showPeerHistory(history, ShowAtUnreadMsgId);
 	}
diff --git a/Telegram/SourceFiles/window/window_peer_menu.cpp b/Telegram/SourceFiles/window/window_peer_menu.cpp
index 9e5f7653f2..1efe6f16d9 100644
--- a/Telegram/SourceFiles/window/window_peer_menu.cpp
+++ b/Telegram/SourceFiles/window/window_peer_menu.cpp
@@ -714,7 +714,7 @@ void Filler::addTogglesForArchive() {
 //	const auto controller = _controller;
 //	const auto feed = _feed;
 //	_addAction(tr::lng_context_view_feed_info(tr::now), [=] {
-//		controller->showSection(Info::Memento(
+//		controller->showSection(std::make_unique<Info::Memento>(
 //			feed,
 //			Info::Section(Info::Section::Type::Profile)));
 //	});
diff --git a/Telegram/SourceFiles/window/window_session_controller.cpp b/Telegram/SourceFiles/window/window_session_controller.cpp
index 56a7c2e193..b6e13be535 100644
--- a/Telegram/SourceFiles/window/window_session_controller.cpp
+++ b/Telegram/SourceFiles/window/window_session_controller.cpp
@@ -253,12 +253,12 @@ void SessionNavigation::showRepliesForMessage(
 	const auto channelId = history->channelId();
 	//const auto item = _session->data().message(channelId, rootId);
 	//if (!commentId && (!item || !item->repliesAreComments())) {
-	//	showSection(HistoryView::RepliesMemento(history, rootId));
+	//	showSection(std::make_unique<HistoryView::RepliesMemento>(history, rootId));
 	//	return;
 	//} else if (const auto id = item ? item->commentsItemId() : FullMsgId()) {
 	//	if (const auto commentsItem = _session->data().message(id)) {
 	//		showSection(
-	//			HistoryView::RepliesMemento(commentsItem));
+	//			std::make_unique<HistoryView::RepliesMemento>(commentsItem));
 	//		return;
 	//	}
 	//}
@@ -314,8 +314,9 @@ void SessionNavigation::showRepliesForMessage(
 						post->setRepliesOutboxReadTill(readTill->v);
 					}
 				}
-				showSection(
-					HistoryView::RepliesMemento(item, commentId));
+				showSection(std::make_unique<HistoryView::RepliesMemento>(
+					item,
+					commentId));
 			}
 		});
 	}).fail([=](const RPCError &error) {
@@ -341,7 +342,7 @@ void SessionNavigation::showPeerInfo(
 	//	Core::App().settings().setThirdSectionInfoEnabled(true);
 	//	Core::App().saveSettingsDelayed();
 	//}
-	showSection(Info::Memento(peer), params);
+	showSection(std::make_unique<Info::Memento>(peer), params);
 }
 
 void SessionNavigation::showPeerInfo(
@@ -374,7 +375,7 @@ void SessionNavigation::showSettings(
 		Settings::Type type,
 		const SectionShow &params) {
 	showSection(
-		Info::Memento(
+		std::make_unique<Info::Memento>(
 			Info::Settings::Tag{ _session->user() },
 			Info::Section(type)),
 		params);
@@ -388,7 +389,7 @@ void SessionNavigation::showPollResults(
 		not_null<PollData*> poll,
 		FullMsgId contextId,
 		const SectionShow &params) {
-	showSection(Info::Memento(poll, contextId), params);
+	showSection(std::make_unique<Info::Memento>(poll, contextId), params);
 }
 
 SessionController::SessionController(
@@ -639,9 +640,9 @@ bool SessionController::jumpToChatListEntry(Dialogs::RowDescriptor row) {
 		return true;
 	//} else if (const auto feed = row.key.feed()) { // #feed
 	//	if (const auto item = session().data().message(row.fullId)) {
-	//		showSection(HistoryFeed::Memento(feed, item->position()));
+	//		showSection(std::make_unique<HistoryFeed::Memento>(feed, item->position()));
 	//	} else {
-	//		showSection(HistoryFeed::Memento(feed));
+	//		showSection(std::make_unique<HistoryFeed::Memento>(feed));
 	//	}
 	}
 	return false;
@@ -1086,10 +1087,10 @@ void SessionController::showPeerHistory(
 }
 
 void SessionController::showSection(
-		SectionMemento &&memento,
+		std::unique_ptr<SectionMemento> &&memento,
 		const SectionShow &params) {
 	if (!params.thirdColumn && widget()->showSectionInExistingLayer(
-			&memento,
+			memento.get(),
 			params)) {
 		return;
 	}
diff --git a/Telegram/SourceFiles/window/window_session_controller.h b/Telegram/SourceFiles/window/window_session_controller.h
index 900ad24875..88f563031c 100644
--- a/Telegram/SourceFiles/window/window_session_controller.h
+++ b/Telegram/SourceFiles/window/window_session_controller.h
@@ -132,7 +132,7 @@ public:
 	Main::Session &session() const;
 
 	virtual void showSection(
-		SectionMemento &&memento,
+		std::unique_ptr<SectionMemento> &&memento,
 		const SectionShow &params = SectionShow()) = 0;
 	virtual void showBackFromStack(
 		const SectionShow &params = SectionShow()) = 0;
@@ -301,7 +301,7 @@ public:
 		bool confirmedLeaveOther = false);
 
 	void showSection(
-		SectionMemento &&memento,
+		std::unique_ptr<SectionMemento> &&memento,
 		const SectionShow &params = SectionShow()) override;
 	void showBackFromStack(
 		const SectionShow &params = SectionShow()) override;