diff --git a/Telegram/SourceFiles/base/unique_qptr.h b/Telegram/SourceFiles/base/unique_qptr.h
index c87f1ba296..f10a357dab 100644
--- a/Telegram/SourceFiles/base/unique_qptr.h
+++ b/Telegram/SourceFiles/base/unique_qptr.h
@@ -40,7 +40,7 @@ public:
 	unique_qptr &operator=(unique_qptr &&other) {
 		if (_object != other._object) {
 			destroy();
-			_object = std::move(other._object);
+			_object = base::take(other._object);
 		}
 		return *this;
 	}
@@ -58,18 +58,17 @@ public:
 	unique_qptr &operator=(unique_qptr<U> &&other) {
 		if (_object != other._object) {
 			destroy();
-			_object = std::move(other._object);
+			_object = base::take(other._object);
 		}
 		return *this;
 	}
 
 	unique_qptr &operator=(std::nullptr_t) {
 		destroy();
-		_object = nullptr;
 		return *this;
 	}
 
-	void reset(T *value) {
+	void reset(T *value = nullptr) {
 		if (_object != value) {
 			destroy();
 			_object = value;
diff --git a/Telegram/SourceFiles/info/info_common_groups_inner_widget.cpp b/Telegram/SourceFiles/info/info_common_groups_inner_widget.cpp
index 5a2daf79a6..d93c826be2 100644
--- a/Telegram/SourceFiles/info/info_common_groups_inner_widget.cpp
+++ b/Telegram/SourceFiles/info/info_common_groups_inner_widget.cpp
@@ -21,6 +21,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/info_common_groups_inner_widget.h"
 
 #include "info/info_common_groups_widget.h"
+#include "info/info_controller.h"
 #include "lang/lang_keys.h"
 #include "styles/style_info.h"
 #include "styles/style_widgets.h"
@@ -35,13 +36,13 @@ namespace {
 
 constexpr int kCommonGroupsPerPage = 40;
 
-class Controller
+class ListController
 	: public PeerListController
 	, private base::Subscriber
 	, private MTP::Sender {
 public:
-	Controller(
-		not_null<Window::Controller*> window,
+	ListController(
+		not_null<Controller*> controller,
 		not_null<UserData*> user);
 
 	void prepare() override;
@@ -49,7 +50,7 @@ public:
 	void loadMoreRows() override;
 
 private:
-	not_null<Window::Controller*> _window;
+	const not_null<Controller*> _controller;
 	not_null<UserData*> _user;
 	mtpRequestId _preloadRequestId = 0;
 	bool _allLoaded = false;
@@ -57,21 +58,21 @@ private:
 
 };
 
-Controller::Controller(
-	not_null<Window::Controller*> window,
+ListController::ListController(
+	not_null<Controller*> controller,
 	not_null<UserData*> user)
 : PeerListController()
-, _window(window)
+, _controller(controller)
 , _user(user) {
 }
 
-void Controller::prepare() {
+void ListController::prepare() {
 	setSearchNoResultsText(lang(lng_blocked_list_not_found));
 	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
 	delegate()->peerListSetTitle(langFactory(lng_profile_common_groups_section));
 }
 
-void Controller::loadMoreRows() {
+void ListController::loadMoreRows() {
 	if (_preloadRequestId || _allLoaded) {
 		return;
 	}
@@ -103,8 +104,8 @@ void Controller::loadMoreRows() {
 	}).send();
 }
 
-void Controller::rowClicked(not_null<PeerListRow*> row) {
-	_window->showPeerHistory(
+void ListController::rowClicked(not_null<PeerListRow*> row) {
+	_controller->window()->showPeerHistory(
 		row->peer(),
 		Window::SectionShow::Way::Forward);
 }
@@ -113,11 +114,11 @@ void Controller::rowClicked(not_null<PeerListRow*> row) {
 
 InnerWidget::InnerWidget(
 	QWidget *parent,
-	not_null<Window::Controller*> controller,
+	not_null<Controller*> controller,
 	not_null<UserData*> user)
 : RpWidget(parent)
 , _user(user)
-, _listController(std::make_unique<Controller>(controller, _user))
+, _listController(std::make_unique<ListController>(controller, _user))
 , _list(setupList(this, _listController.get())) {
 	setContent(_list.data());
 	_listController->setDelegate(static_cast<PeerListDelegate*>(this));
diff --git a/Telegram/SourceFiles/info/info_common_groups_inner_widget.h b/Telegram/SourceFiles/info/info_common_groups_inner_widget.h
index f12d835be8..06a3eb91a9 100644
--- a/Telegram/SourceFiles/info/info_common_groups_inner_widget.h
+++ b/Telegram/SourceFiles/info/info_common_groups_inner_widget.h
@@ -25,6 +25,9 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "boxes/peer_list_box.h"
 
 namespace Info {
+
+class Controller;
+
 namespace CommonGroups {
 
 class Memento;
@@ -35,7 +38,7 @@ class InnerWidget final
 public:
 	InnerWidget(
 		QWidget *parent,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		not_null<UserData*> user);
 
 	not_null<UserData*> user() const {
diff --git a/Telegram/SourceFiles/info/info_common_groups_widget.cpp b/Telegram/SourceFiles/info/info_common_groups_widget.cpp
index eb7a249311..3ca5368229 100644
--- a/Telegram/SourceFiles/info/info_common_groups_widget.cpp
+++ b/Telegram/SourceFiles/info/info_common_groups_widget.cpp
@@ -21,19 +21,22 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/info_common_groups_widget.h"
 
 #include "info/info_common_groups_inner_widget.h"
+#include "info/info_controller.h"
 #include "ui/widgets/scroll_area.h"
 
 namespace Info {
 namespace CommonGroups {
 
+Section Memento::section() const {
+	return Section(Section::Type::CommonGroups);
+}
+
 object_ptr<ContentWidget> Memento::createWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		const QRect &geometry) {
 	auto result = object_ptr<Widget>(
 		parent,
-		std::move(wrap),
 		controller,
 		App::user(userId()));
 	result->setInternalState(geometry, this);
@@ -42,10 +45,9 @@ object_ptr<ContentWidget> Memento::createWidget(
 
 Widget::Widget(
 	QWidget *parent,
-	rpl::producer<Wrap> wrap,
-	not_null<Window::Controller*> controller,
+	not_null<Controller*> controller,
 	not_null<UserData*> user)
-: ContentWidget(parent, wrap, controller, user) {
+: ContentWidget(parent, controller) {
 	_inner = setInnerWidget(object_ptr<InnerWidget>(
 		this,
 		controller,
@@ -56,11 +58,10 @@ not_null<UserData*> Widget::user() const {
 	return _inner->user();
 }
 
-Section Widget::section() const {
-	return Section(Section::Type::CommonGroups);
-}
-
 bool Widget::showInternal(not_null<ContentMemento*> memento) {
+	if (!controller()->validateMementoPeer(memento)) {
+		return false;
+	}
 	if (auto groupsMemento = dynamic_cast<Memento*>(memento.get())) {
 		if (groupsMemento->userId() == user()->bareId()) {
 			restoreState(groupsMemento);
diff --git a/Telegram/SourceFiles/info/info_common_groups_widget.h b/Telegram/SourceFiles/info/info_common_groups_widget.h
index 77ae99bd51..eb9955fc9b 100644
--- a/Telegram/SourceFiles/info/info_common_groups_widget.h
+++ b/Telegram/SourceFiles/info/info_common_groups_widget.h
@@ -30,18 +30,16 @@ class InnerWidget;
 
 class Memento final : public ContentMemento {
 public:
-	Memento(UserId userId) : ContentMemento(peerFromUser(userId)) {
+	Memento(UserId userId)
+	: ContentMemento(peerFromUser(userId), 0) {
 	}
 
 	object_ptr<ContentWidget> createWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		const QRect &geometry) override;
 
-	Section section() const override {
-		return Section(Section::Type::CommonGroups);
-	}
+	Section section() const override;
 
 	UserId userId() const {
 		return peerToUser(peerId());
@@ -55,12 +53,10 @@ class Widget final : public ContentWidget {
 public:
 	Widget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		not_null<UserData*> user);
 
 	not_null<UserData*> user() const;
-	Section section() const override;
 
 	bool showInternal(
 		not_null<ContentMemento*> memento) override;
diff --git a/Telegram/SourceFiles/info/info_content_widget.cpp b/Telegram/SourceFiles/info/info_content_widget.cpp
index e61344deaa..9c7f229629 100644
--- a/Telegram/SourceFiles/info/info_content_widget.cpp
+++ b/Telegram/SourceFiles/info/info_content_widget.cpp
@@ -31,6 +31,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/info_common_groups_widget.h"
 #include "info/info_layer_widget.h"
 #include "info/info_section_widget.h"
+#include "info/info_controller.h"
 #include "styles/style_info.h"
 #include "styles/style_profile.h"
 
@@ -38,22 +39,18 @@ namespace Info {
 
 ContentWidget::ContentWidget(
 	QWidget *parent,
-	rpl::producer<Wrap> wrap,
-	not_null<Window::Controller*> controller,
-	not_null<PeerData*> peer)
+	not_null<Controller*> controller)
 : RpWidget(parent)
 , _controller(controller)
-, _peer(peer)
 , _scroll(this, st::infoScroll) {
 	setAttribute(Qt::WA_OpaquePaintEvent);
-	std::move(wrap) | rpl::start_with_next(
-		[this](Wrap value) {
+	_controller->wrapValue()
+		| rpl::start_with_next([this](Wrap value) {
 			_bg = (value == Wrap::Layer)
 				? st::boxBg
 				: st::profileBg;
 			update();
-		},
-		lifetime());
+		}, lifetime());
 }
 
 void ContentWidget::resizeEvent(QResizeEvent *e) {
diff --git a/Telegram/SourceFiles/info/info_content_widget.h b/Telegram/SourceFiles/info/info_content_widget.h
index fbf4c57cef..b515b194a6 100644
--- a/Telegram/SourceFiles/info/info_content_widget.h
+++ b/Telegram/SourceFiles/info/info_content_widget.h
@@ -33,21 +33,16 @@ class ScrollArea;
 struct ScrollToRequest;
 } // namespace Ui
 
-namespace Window {
-class Controller;
-} // namespace Window
-
 namespace Info {
 
 class ContentMemento;
+class Controller;
 
 class ContentWidget : public Ui::RpWidget {
 public:
 	ContentWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
-		not_null<PeerData*> peer);
+		not_null<Controller*> controller);
 
 	virtual bool showInternal(
 		not_null<ContentMemento*> memento) = 0;
@@ -57,11 +52,6 @@ public:
 	virtual void setIsStackBottom(bool isStackBottom) {
 	}
 
-	virtual Section section() const = 0;
-	not_null<PeerData*> peer() const {
-		return _peer;
-	}
-
 	rpl::producer<int> desiredHeightValue() const override;
 	rpl::producer<bool> desiredShadowVisibility() const;
 	bool hasTopBarShadow() const;
@@ -94,7 +84,7 @@ protected:
 			doSetInnerWidget(std::move(inner), scrollTopSkip));
 	}
 
-	not_null<Window::Controller*> controller() const {
+	not_null<Controller*> controller() const {
 		return _controller;
 	}
 
@@ -112,8 +102,7 @@ private:
 		int scrollTopSkip);
 	void updateControlsGeometry();
 
-	const not_null<Window::Controller*> _controller;
-	const not_null<PeerData*> _peer;
+	const not_null<Controller*> _controller;
 
 	style::color _bg;
 	int _scrollTopSkip = 0;
@@ -127,18 +116,23 @@ private:
 
 class ContentMemento {
 public:
-	ContentMemento(PeerId peerId) : _peerId(peerId) {
+	ContentMemento(PeerId peerId, PeerId migratedPeerId)
+	: _peerId(peerId)
+	, _migratedPeerId(migratedPeerId) {
 	}
 
 	virtual object_ptr<ContentWidget> createWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		const QRect &geometry) = 0;
 
-	virtual PeerId peerId() const {
+	PeerId peerId() const {
 		return _peerId;
 	}
+	PeerId migratedPeerId() const {
+		return _migratedPeerId;
+	}
+
 	virtual Section section() const = 0;
 
 	virtual ~ContentMemento() = default;
@@ -151,7 +145,8 @@ public:
 	}
 
 private:
-	PeerId _peerId = 0;
+	const PeerId _peerId = 0;
+	const PeerId _migratedPeerId = 0;
 	int _scrollTop = 0;
 
 };
diff --git a/Telegram/SourceFiles/info/info_controller.cpp b/Telegram/SourceFiles/info/info_controller.cpp
new file mode 100644
index 0000000000..8ae3700ffc
--- /dev/null
+++ b/Telegram/SourceFiles/info/info_controller.cpp
@@ -0,0 +1,139 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop version of Telegram messaging app, see https://telegram.org
+
+Telegram Desktop is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+It is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+In addition, as a special exception, the copyright holders give permission
+to link the code of portions of this program with the OpenSSL library.
+
+Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
+Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
+*/
+#include "info/info_controller.h"
+
+#include "ui/search_field_controller.h"
+#include "history/history_shared_media.h"
+#include "info/info_content_widget.h"
+#include "info/info_memento.h"
+
+namespace Info {
+namespace {
+
+not_null<PeerData*> CorrectPeer(PeerId peerId) {
+	Expects(peerId != 0);
+	auto result = App::peer(peerId);
+	if (auto to = result->migrateTo()) {
+		return to;
+	}
+	return result;
+}
+
+} // namespace
+
+Controller::Controller(
+	not_null<WrapWidget*> widget,
+	not_null<Window::Controller*> window,
+	not_null<ContentMemento*> memento)
+: _widget(widget)
+, _peer(App::peer(memento->peerId()))
+, _migrated(memento->migratedPeerId()
+	? App::peer(memento->migratedPeerId())
+	: nullptr)
+, _window(window)
+, _section(memento->section()) {
+	updateSearchControllers();
+}
+
+Wrap Controller::wrap() const {
+	return _widget->wrap();
+}
+
+rpl::producer<Wrap> Controller::wrapValue() const {
+	return _widget->wrapValue();
+}
+
+bool Controller::validateMementoPeer(
+		not_null<ContentMemento*> memento) const {
+	return memento->peerId() == peerId()
+		&& memento->migratedPeerId() == migratedPeerId();
+}
+
+void Controller::setSection(const Section &section) {
+	_section = section;
+	updateSearchControllers();
+}
+
+void Controller::updateSearchControllers() {
+	auto isMedia = (_section.type() == Section::Type::Media);
+	auto mediaType = isMedia
+		? _section.mediaType()
+		: Section::MediaType::kCount;
+	auto hasMediaSearch = isMedia
+		&& SharedMediaAllowSearch(mediaType);
+//	auto hasCommonGroupsSearch
+//		= (_section.type() == Section::Type::CommonGroups);
+	if (isMedia) {
+		_searchController
+			= std::make_unique<Api::DelayedSearchController>();
+		_searchController->setQueryFast(produceSearchQuery());
+	} else {
+		_searchController = nullptr;
+	}
+	if (hasMediaSearch) {
+		_searchFieldController
+			= std::make_unique<Ui::SearchFieldController>();
+		_searchFieldController->queryValue()
+			| rpl::start_with_next([=](QString &&query) {
+				_searchController->setQuery(
+					produceSearchQuery(std::move(query)));
+			}, _searchFieldController->lifetime());
+	} else {
+		_searchFieldController = nullptr;
+	}
+}
+
+auto Controller::produceSearchQuery(
+		QString &&query) const -> SearchQuery {
+	auto result = SearchQuery();
+	result.type = _section.mediaType();
+	result.peerId = _peer->id;
+	result.query = std::move(query);
+	result.migratedPeerId = _migrated ? _migrated->id : PeerId(0);
+	return result;
+}
+
+rpl::producer<SparseIdsMergedSlice> Controller::mediaSource(
+		SparseIdsMergedSlice::UniversalMsgId aroundId,
+		int limitBefore,
+		int limitAfter) const {
+	auto query = _searchController->currentQuery();
+	if (!query.query.isEmpty()) {
+		return _searchController->idsSlice(
+			aroundId,
+			limitBefore,
+			limitAfter);
+	}
+
+	return SharedMediaMergedViewer(
+		SharedMediaMergedKey(
+			SparseIdsMergedSlice::Key(
+				query.peerId,
+				query.migratedPeerId,
+				aroundId),
+			query.type),
+		limitBefore,
+		limitAfter);
+}
+
+Controller::~Controller() = default;
+
+} // namespace Info
diff --git a/Telegram/SourceFiles/info/info_controller.h b/Telegram/SourceFiles/info/info_controller.h
new file mode 100644
index 0000000000..ed0e7831c0
--- /dev/null
+++ b/Telegram/SourceFiles/info/info_controller.h
@@ -0,0 +1,143 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop version of Telegram messaging app, see https://telegram.org
+
+Telegram Desktop is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+It is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+In addition, as a special exception, the copyright holders give permission
+to link the code of portions of this program with the OpenSSL library.
+
+Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
+Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
+*/
+#pragma once
+
+#include <rpl/variable.h>
+#include "history/history_search_controller.h"
+
+namespace Ui {
+class SearchFieldController;
+} // namespace Ui
+
+namespace Window {
+class Controller;
+} // namespace Window
+
+namespace Info {
+
+enum class Wrap;
+class WrapWidget;
+class Memento;
+class ContentMemento;
+
+class Section final {
+public:
+	enum class Type {
+		Profile,
+		Media,
+		CommonGroups,
+	};
+	using MediaType = Storage::SharedMediaType;
+
+	Section(Type type) : _type(type) {
+		Expects(type != Type::Media);
+	}
+	Section(MediaType mediaType)
+	: _type(Type::Media)
+	, _mediaType(mediaType) {
+	}
+
+	Type type() const {
+		return _type;
+	}
+	MediaType mediaType() const {
+		Expects(_type == Type::Media);
+		return _mediaType;
+	}
+
+private:
+	Type _type;
+	Storage::SharedMediaType _mediaType;
+
+};
+
+class Controller {
+public:
+	Controller(
+		not_null<WrapWidget*> widget,
+		not_null<Window::Controller*> window,
+		not_null<ContentMemento*> memento);
+
+	not_null<PeerData*> peer() const {
+		return _peer;
+	}
+	PeerData *migrated() const {
+		return _migrated;
+	}
+	PeerId peerId() const {
+		return _peer->id;
+	}
+	PeerId migratedPeerId() const {
+		return _migrated ? _migrated->id : PeerId(0);
+	}
+	const Section &section() const {
+		return _section;
+	}
+
+	bool validateMementoPeer(
+		not_null<ContentMemento*> memento) const;
+
+	Wrap wrap() const;
+	rpl::producer<Wrap> wrapValue() const;
+	void setSection(const Section &section);
+
+	not_null<Window::Controller*> window() const {
+		return _window;
+	}
+	Ui::SearchFieldController *searchFieldController() const {
+		return _searchFieldController.get();
+	}
+	rpl::producer<SparseIdsMergedSlice> mediaSource(
+		SparseIdsMergedSlice::UniversalMsgId aroundId,
+		int limitBefore,
+		int limitAfter) const;
+	rpl::producer<> mediaSourceChanged() const {
+		return _searchController->sourceChanged();
+	}
+
+	rpl::lifetime &lifetime() {
+		return _lifetime;
+	}
+
+	~Controller();
+
+private:
+	using SearchQuery = Api::DelayedSearchController::Query;
+
+	void updateSearchControllers();
+	SearchQuery produceSearchQuery(
+		QString &&query = QString()) const;
+
+	not_null<WrapWidget*> _widget;
+	not_null<PeerData*> _peer;
+	PeerData *_migrated = nullptr;
+	not_null<Window::Controller*> _window;
+	rpl::variable<Wrap> _wrap;
+	Section _section;
+
+	std::unique_ptr<Ui::SearchFieldController> _searchFieldController;
+	std::unique_ptr<Api::DelayedSearchController> _searchController;
+
+	rpl::lifetime _lifetime;
+
+};
+
+} // namespace Info
\ No newline at end of file
diff --git a/Telegram/SourceFiles/info/info_memento.cpp b/Telegram/SourceFiles/info/info_memento.cpp
index 2cf8f1c7cd..ef718e65b0 100644
--- a/Telegram/SourceFiles/info/info_memento.cpp
+++ b/Telegram/SourceFiles/info/info_memento.cpp
@@ -25,6 +25,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/info_common_groups_widget.h"
 #include "info/info_section_widget.h"
 #include "info/info_layer_widget.h"
+#include "info/info_controller.h"
 
 namespace Info {
 
@@ -40,23 +41,28 @@ Memento::Memento(std::unique_ptr<ContentMemento> content)
 : _content(std::move(content)) {
 }
 
-PeerId Memento::peerId() const {
-	return _content->peerId();
-}
-
-Section Memento::section() const {
-	return _content->section();
-}
-
 std::unique_ptr<ContentMemento> Memento::Default(
 		PeerId peerId,
 		Section section) {
+	Expects(peerId != 0);
+
+	auto peer = App::peer(peerId);
+	if (auto to = peer->migrateTo()) {
+		peer = to;
+	}
+	auto migrated = peer->migrateFrom();
+	peerId = peer->id;
+	auto migratedPeerId = migrated ? migrated->id : PeerId(0);
+
 	switch (section.type()) {
 	case Section::Type::Profile:
-		return std::make_unique<Profile::Memento>(peerId);
+		return std::make_unique<Profile::Memento>(
+			peerId,
+			migratedPeerId);
 	case Section::Type::Media:
 		return std::make_unique<Media::Memento>(
 			peerId,
+			migratedPeerId,
 			section.mediaType());
 	case Section::Type::CommonGroups:
 		Assert(peerIsUser(peerId));
diff --git a/Telegram/SourceFiles/info/info_memento.h b/Telegram/SourceFiles/info/info_memento.h
index 8010788525..b4fef5be04 100644
--- a/Telegram/SourceFiles/info/info_memento.h
+++ b/Telegram/SourceFiles/info/info_memento.h
@@ -59,9 +59,6 @@ public:
 		return _content.get();
 	}
 
-	PeerId peerId() const;
-	Section section() const;
-
 	~Memento();
 
 private:
diff --git a/Telegram/SourceFiles/info/info_section_widget.cpp b/Telegram/SourceFiles/info/info_section_widget.cpp
index c1b24eca59..309762962d 100644
--- a/Telegram/SourceFiles/info/info_section_widget.cpp
+++ b/Telegram/SourceFiles/info/info_section_widget.cpp
@@ -24,25 +24,26 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/info_wrap_widget.h"
 #include "info/info_layer_widget.h"
 #include "info/info_memento.h"
+#include "info/info_controller.h"
 
 namespace Info {
 
 SectionWidget::SectionWidget(
 	QWidget *parent,
-	not_null<Window::Controller*> controller,
+	not_null<Window::Controller*> window,
 	Wrap wrap,
 	not_null<Memento*> memento)
-: Window::SectionWidget(parent, controller)
-, _content(this, controller, wrap, memento) {
+: Window::SectionWidget(parent, window)
+, _content(this, window, wrap, memento) {
 	init();
 }
 
 SectionWidget::SectionWidget(
 	QWidget *parent,
-	not_null<Window::Controller*> controller,
+	not_null<Window::Controller*> window,
 	Wrap wrap,
 	not_null<MoveMemento*> memento)
-: Window::SectionWidget(parent, controller)
+: Window::SectionWidget(parent, window)
 , _content(memento->takeContent(this, wrap)) {
 	init();
 }
@@ -55,6 +56,11 @@ void SectionWidget::init() {
 		}, _content->lifetime());
 }
 
+not_null<Controller*> SectionWidget::controller() const {
+	Expects(_content != nullptr);
+	return _content->controller();
+}
+
 PeerData *SectionWidget::peerForDialogs() const {
 	return _content->peerForDialogs();
 }
@@ -83,19 +89,19 @@ bool SectionWidget::showInternal(
 }
 
 std::unique_ptr<Window::SectionMemento> SectionWidget::createMemento() {
-	auto result = std::make_unique<Memento>(_content->peer()->id);
-	_content->saveState(result.get());
-	return std::move(result);
+	return _content->createMemento();
 }
 
 object_ptr<Window::LayerWidget> SectionWidget::moveContentToLayer(
 		QRect bodyGeometry) {
-	if (_content->wrap() != Wrap::Narrow
+	if (controller()->wrap() != Wrap::Narrow
 		|| width() < LayerWidget::MinimalSupportedWidth()) {
 		return nullptr;
 	}
 	return MoveMemento(
-		std::move(_content)).createLayer(controller(), bodyGeometry);
+		std::move(_content)).createLayer(
+			controller()->window(),
+			bodyGeometry);
 }
 
 bool SectionWidget::wheelEventFromFloatPlayer(QEvent *e) {
diff --git a/Telegram/SourceFiles/info/info_section_widget.h b/Telegram/SourceFiles/info/info_section_widget.h
index b1a440d8b7..499fcf8534 100644
--- a/Telegram/SourceFiles/info/info_section_widget.h
+++ b/Telegram/SourceFiles/info/info_section_widget.h
@@ -31,6 +31,7 @@ namespace Info {
 
 class Memento;
 class MoveMemento;
+class Controller;
 class WrapWidget;
 enum class Wrap;
 
@@ -38,12 +39,12 @@ class SectionWidget final : public Window::SectionWidget {
 public:
 	SectionWidget(
 		QWidget *parent,
-		not_null<Window::Controller*> controller,
+		not_null<Window::Controller*> window,
 		Wrap wrap,
 		not_null<Memento*> memento);
 	SectionWidget(
 		QWidget *parent,
-		not_null<Window::Controller*> controller,
+		not_null<Window::Controller*> window,
 		Wrap wrap,
 		not_null<MoveMemento*> memento);
 
@@ -72,6 +73,8 @@ protected:
 private:
 	void init();
 
+	not_null<Controller*> controller() const;
+
 	object_ptr<WrapWidget> _content;
 
 };
diff --git a/Telegram/SourceFiles/info/info_top_bar.cpp b/Telegram/SourceFiles/info/info_top_bar.cpp
index 8ae70aa70b..1f3ccedf5d 100644
--- a/Telegram/SourceFiles/info/info_top_bar.cpp
+++ b/Telegram/SourceFiles/info/info_top_bar.cpp
@@ -23,6 +23,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "styles/style_info.h"
 #include "lang/lang_keys.h"
 #include "info/info_wrap_widget.h"
+#include "info/info_controller.h"
 #include "storage/storage_shared_media.h"
 #include "ui/widgets/buttons.h"
 #include "ui/widgets/labels.h"
@@ -102,19 +103,19 @@ void TopBar::paintEvent(QPaintEvent *e) {
 
 rpl::producer<QString> TitleValue(
 		const Section &section,
-		PeerId peerId) {
+		not_null<PeerData*> peer) {
 	return Lang::Viewer([&] {
 		switch (section.type()) {
 		case Section::Type::Profile:
-			if (peerIsUser(peerId)) {
-				return App::user(peerId)->botInfo
+			if (auto user = peer->asUser()) {
+				return user->botInfo
 					? lng_info_bot_title
 					: lng_info_user_title;
-			} else if (peerIsChannel(peerId)) {
-				return App::channel(peerId)->isMegagroup()
+			} else if (auto channel = peer->asChannel()) {
+				return channel->isMegagroup()
 					? lng_info_group_title
 					: lng_info_channel_title;
-			} else if (peerIsChat(peerId)) {
+			} else if (peer->isChat()) {
 				return lng_info_group_title;
 			}
 			Unexpected("Bad peer type in Info::TitleValue()");
diff --git a/Telegram/SourceFiles/info/info_top_bar.h b/Telegram/SourceFiles/info/info_top_bar.h
index e3a264124d..2f31f955d4 100644
--- a/Telegram/SourceFiles/info/info_top_bar.h
+++ b/Telegram/SourceFiles/info/info_top_bar.h
@@ -37,7 +37,7 @@ class Section;
 
 rpl::producer<QString> TitleValue(
 	const Section &section,
-	PeerId peerId);
+	not_null<PeerData*> peer);
 
 class TopBar : public Ui::RpWidget {
 public:
diff --git a/Telegram/SourceFiles/info/info_wrap_widget.cpp b/Telegram/SourceFiles/info/info_wrap_widget.cpp
index d9622bd5fb..24171f0a1c 100644
--- a/Telegram/SourceFiles/info/info_wrap_widget.cpp
+++ b/Telegram/SourceFiles/info/info_wrap_widget.cpp
@@ -25,6 +25,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/profile/info_profile_widget.h"
 #include "info/media/info_media_widget.h"
 #include "info/info_content_widget.h"
+#include "info/info_controller.h"
 #include "info/info_memento.h"
 #include "info/info_top_bar.h"
 #include "info/info_top_bar_override.h"
@@ -57,13 +58,19 @@ struct WrapWidget::StackItem {
 
 WrapWidget::WrapWidget(
 	QWidget *parent,
-	not_null<Window::Controller*> controller,
+	not_null<Window::Controller*> window,
 	Wrap wrap,
 	not_null<Memento*> memento)
-: SectionWidget(parent, controller)
+: SectionWidget(parent, window)
 , _wrap(wrap)
+, _controller(createController(window, memento->content()))
 , _topShadow(this) {
 	_topShadow->toggleOn(topShadowToggledValue());
+	_wrap.changes()
+		| rpl::start_with_next([this] {
+			setupTop();
+			finishShowContent();
+		}, lifetime());
 	selectedListValue()
 		| rpl::start_with_next([this](SelectedItems &&items) {
 			InvokeQueued(this, [this, items = std::move(items)]() mutable {
@@ -73,20 +80,18 @@ WrapWidget::WrapWidget(
 	showNewContent(memento->content());
 }
 
+std::unique_ptr<Controller> WrapWidget::createController(
+		not_null<Window::Controller*> window,
+		not_null<ContentMemento*> memento) {
+	auto result = std::make_unique<Controller>(
+		this,
+		window,
+		memento);
+	return result;
+}
+
 not_null<PeerData*> WrapWidget::peer() const {
-	return _content->peer();
-}
-
-Wrap WrapWidget::wrap() const {
-	return _wrap.current();
-}
-
-void WrapWidget::setWrap(Wrap wrap) {
-	if (_wrap.current() != wrap) {
-		_wrap = wrap;
-		setupTop(_content->section(), _content->peer()->id);
-		finishShowContent();
-	}
+	return _controller->peer();
 }
 
 void WrapWidget::createTabs() {
@@ -138,9 +143,15 @@ void WrapWidget::showTab(Tab tab) {
 		? SlideDirection::FromRight
 		: SlideDirection::FromLeft;
 	auto newAnotherMemento = _content->createMemento();
-	auto newContent = _anotherTabMemento
-		? createContent(_anotherTabMemento.get())
-		: createContent(tab);
+	if (!_anotherTabMemento) {
+		_anotherTabMemento = createTabMemento(tab);
+	}
+	auto newController = createController(
+		_controller->window(),
+		_anotherTabMemento.get());
+	auto newContent = createContent(
+		_anotherTabMemento.get(),
+		newController.get());
 	auto animationParams = SectionSlideParams();
 //	animationParams.withFade = (wrap() == Wrap::Layer);
 	animationParams.withTabs = true;
@@ -149,6 +160,7 @@ void WrapWidget::showTab(Tab tab) {
 	animationParams.oldContentCache = grabForShowAnimation(
 		animationParams);
 
+	_controller = std::move(newController);
 	showContent(std::move(newContent));
 
 	showAnimated(direction, animationParams);
@@ -157,7 +169,8 @@ void WrapWidget::showTab(Tab tab) {
 	_tab = tab;
 }
 
-void WrapWidget::setupTabbedTop(const Section &section) {
+void WrapWidget::setupTabbedTop() {
+	auto section = _controller->section();
 	switch (section.type()) {
 	case Section::Type::Profile:
 		setupTabs(Tab::Profile);
@@ -180,30 +193,26 @@ void WrapWidget::setupTabbedTop(const Section &section) {
 	}
 }
 
-void WrapWidget::setupTop(
-		const Section &section,
-		PeerId peerId) {
+void WrapWidget::setupTop() {
 	if (wrap() == Wrap::Side && _historyStack.empty()) {
-		setupTabbedTop(section);
+		setupTabbedTop();
 	} else {
 		setupTabs(Tab::None);
 	}
 	if (_topTabs) {
 		_topBar.destroy();
 	} else {
-		createTopBar(section, peerId);
+		createTopBar();
 	}
 	refreshTopBarOverride();
 }
 
-void WrapWidget::createTopBar(
-		const Section &section,
-		PeerId peerId) {
+void WrapWidget::createTopBar() {
 	_topBar.create(this, TopBarStyle(wrap()));
 
 	_topBar->setTitle(TitleValue(
-		section,
-		peerId));
+		_controller->section(),
+		_controller->peer()));
 	if (wrap() != Wrap::Layer || !_historyStack.empty()) {
 		_topBar->enableBackButton(true);
 		_topBar->backRequest()
@@ -216,7 +225,7 @@ void WrapWidget::createTopBar(
 			_topBar,
 			st::infoLayerTopBarClose));
 		close->addClickHandler([this] {
-			controller()->hideSpecialLayer();
+			_controller->window()->hideSpecialLayer();
 		});
 	}
 
@@ -290,7 +299,7 @@ void WrapWidget::showBackFromStack() {
 			params);
 		_anotherTabMemento = std::move(last.anotherTab);
 	} else {
-		controller()->showBackFromStack(params);
+		_controller->window()->showBackFromStack(params);
 	}
 }
 
@@ -324,7 +333,7 @@ void WrapWidget::finishShowContent() {
 rpl::producer<bool> WrapWidget::topShadowToggledValue() const {
 	using namespace rpl::mappers;
 	return rpl::combine(
-		_wrap.value(),
+		_controller->wrapValue(),
 		_desiredShadowVisibilities.events() | rpl::flatten_latest(),
 		($1 == Wrap::Side) || $2);
 }
@@ -341,39 +350,26 @@ rpl::producer<SelectedItems> WrapWidget::selectedListValue() const {
 	return _selectedLists.events() | rpl::flatten_latest();
 }
 
-object_ptr<ContentWidget> WrapWidget::createContent(Tab tab) {
+std::unique_ptr<ContentMemento> WrapWidget::createTabMemento(
+		Tab tab) {
 	switch (tab) {
-	case Tab::Profile: return createProfileWidget();
-	case Tab::Media: return createMediaWidget();
+	case Tab::Profile: return std::make_unique<Profile::Memento>(
+		_controller->peerId(),
+		_controller->migratedPeerId());
+	case Tab::Media: return std::make_unique<Media::Memento>(
+		_controller->peerId(),
+		_controller->migratedPeerId(),
+		Media::Memento::Type::Photo);
 	}
 	Unexpected("Tab value in Info::WrapWidget::createInner()");
 }
 
-object_ptr<Profile::Widget> WrapWidget::createProfileWidget() {
-	auto result = object_ptr<Profile::Widget>(
-		this,
-		_wrap.value(),
-		controller(),
-		_content->peer());
-	return result;
-}
-
-object_ptr<Media::Widget> WrapWidget::createMediaWidget() {
-	auto result = object_ptr<Media::Widget>(
-		this,
-		_wrap.value(),
-		controller(),
-		_content->peer(),
-		Media::Widget::Type::Photo);
-	return result;
-}
-
 object_ptr<ContentWidget> WrapWidget::createContent(
-		not_null<ContentMemento*> memento) {
+		not_null<ContentMemento*> memento,
+		not_null<Controller*> controller) {
 	return memento->createWidget(
 		this,
-		_wrap.value(),
-		controller(),
+		controller,
 		contentGeometry());
 }
 
@@ -423,20 +419,21 @@ bool WrapWidget::showInternal(
 		const Window::SectionShow &params) {
 	if (auto infoMemento = dynamic_cast<Memento*>(memento.get())) {
 		auto content = infoMemento->content();
-		if (!_content->showInternal(content)) {
-			showNewContent(
-				content,
-				params);
+		if (_controller->validateMementoPeer(content)) {
+			if (_content->showInternal(content)) {
+				return true;
+			}
 		}
+		showNewContent(
+			content,
+			params);
 		return true;
 	}
 	return false;
 }
 
 std::unique_ptr<Window::SectionMemento> WrapWidget::createMemento() {
-	auto result = std::make_unique<Memento>(_content->peer()->id);
-	saveState(result.get());
-	return std::move(result);
+	return std::make_unique<Memento>(_content->createMemento());
 }
 
 rpl::producer<int> WrapWidget::desiredHeightValue() const {
@@ -446,10 +443,6 @@ rpl::producer<int> WrapWidget::desiredHeightValue() const {
 		| rpl::flatten_latest();
 }
 
-void WrapWidget::saveState(not_null<Memento*> memento) {
-	memento->setInner(_content->createMemento());
-}
-
 QRect WrapWidget::contentGeometry() const {
 	return rect().marginsRemoved({ 0, topWidget()->height(), 0, 0 });
 }
@@ -462,9 +455,12 @@ void WrapWidget::showNewContent(
 	auto needAnimation = (_content != nullptr)
 		&& (params.animated != anim::type::instant);
 	auto animationParams = SectionSlideParams();
+	auto newController = createController(
+		_controller->window(),
+		memento);
 	auto newContent = object_ptr<ContentWidget>(nullptr);
 	if (needAnimation) {
-		newContent = createContent(memento);
+		newContent = createContent(memento, newController.get());
 		animationParams.withTopBarShadow = hasTopBarShadow()
 			&& newContent->hasTopBarShadow();
 		animationParams.oldContentCache = grabForShowAnimation(
@@ -481,8 +477,10 @@ void WrapWidget::showNewContent(
 	} else if (params.way == Window::SectionShow::Way::ClearStack) {
 		_historyStack.clear();
 	}
+
+	_controller = std::move(newController);
 	if (newContent) {
-		setupTop(newContent->section(), newContent->peer()->id);
+		setupTop();
 		showContent(std::move(newContent));
 	} else {
 		showNewContent(memento);
@@ -498,8 +496,8 @@ void WrapWidget::showNewContent(
 
 void WrapWidget::showNewContent(not_null<ContentMemento*> memento) {
 	// Validates contentGeometry().
-	setupTop(memento->section(), memento->peerId());
-	showContent(createContent(memento));
+	setupTop();
+	showContent(createContent(memento, _controller.get()));
 }
 
 void WrapWidget::setupTabs(Tab tab) {
diff --git a/Telegram/SourceFiles/info/info_wrap_widget.h b/Telegram/SourceFiles/info/info_wrap_widget.h
index d9ac111239..48a0c7c97e 100644
--- a/Telegram/SourceFiles/info/info_wrap_widget.h
+++ b/Telegram/SourceFiles/info/info_wrap_widget.h
@@ -43,6 +43,7 @@ namespace Media {
 class Widget;
 } // namespace Media
 
+class Controller;
 class Section;
 class Memento;
 class MoveMemento;
@@ -57,37 +58,6 @@ enum class Wrap {
 	Side,
 };
 
-class Section final {
-public:
-	enum class Type {
-		Profile,
-		Media,
-		CommonGroups,
-	};
-	using MediaType = Storage::SharedMediaType;
-
-	Section(Type type) : _type(type) {
-		Expects(type != Type::Media);
-	}
-	Section(MediaType mediaType)
-		: _type(Type::Media)
-		, _mediaType(mediaType) {
-	}
-
-	Type type() const {
-		return _type;
-	}
-	MediaType mediaType() const {
-		Expects(_type == Type::Media);
-		return _mediaType;
-	}
-
-private:
-	Type _type;
-	Storage::SharedMediaType _mediaType;
-
-};
-
 struct SelectedItem {
 	explicit SelectedItem(FullMsgId msgId) : msgId(msgId) {
 	}
@@ -111,7 +81,7 @@ class WrapWidget final : public Window::SectionWidget {
 public:
 	WrapWidget(
 		QWidget *parent,
-		not_null<Window::Controller*> controller,
+		not_null<Window::Controller*> window,
 		Wrap wrap,
 		not_null<Memento*> memento);
 
@@ -119,9 +89,19 @@ public:
 	PeerData *peerForDialogs() const override {
 		return peer();
 	}
+	Wrap wrap() const {
+		return _wrap.current();
+	}
+	rpl::producer<Wrap> wrapValue() const {
+		return _wrap.value();
+	}
+	void setWrap(Wrap wrap) {
+		_wrap = wrap;
+	}
 
-	Wrap wrap() const;
-	void setWrap(Wrap wrap);
+	not_null<Controller*> controller() {
+		return _controller.get();
+	}
 
 	bool hasTopBarShadow() const override;
 	QPixmap grabForShowAnimation(
@@ -138,7 +118,6 @@ public:
 	rpl::producer<int> desiredHeightValue() const override;
 
 	void updateInternalState(not_null<Memento*> memento);
-	void saveState(not_null<Memento*> memento);
 
 	// Float player interface.
 	bool wheelEventFromFloatPlayer(QEvent *e) override;
@@ -167,13 +146,11 @@ private:
 	void showNewContent(
 		not_null<ContentMemento*> memento,
 		const Window::SectionShow &params);
-	void setupTop(const Section &section, PeerId peerId);
-	void setupTabbedTop(const Section &section);
+	void setupTop();
+	void setupTabbedTop();
 	void setupTabs(Tab tab);
 	void createTabs();
-	void createTopBar(
-		const Section &section,
-		PeerId peerId);
+	void createTopBar();
 
 	not_null<RpWidget*> topWidget() const;
 
@@ -185,10 +162,12 @@ private:
 
 	void showTab(Tab tab);
 	void showContent(object_ptr<ContentWidget> content);
-	object_ptr<ContentWidget> createContent(Tab tab);
-	object_ptr<Profile::Widget> createProfileWidget();
-	object_ptr<Media::Widget> createMediaWidget();
+	std::unique_ptr<ContentMemento> createTabMemento(Tab tab);
 	object_ptr<ContentWidget> createContent(
+		not_null<ContentMemento*> memento,
+		not_null<Controller*> controller);
+	std::unique_ptr<Controller> createController(
+		not_null<Window::Controller*> window,
 		not_null<ContentMemento*> memento);
 
 	rpl::producer<SelectedItems> selectedListValue() const;
@@ -198,6 +177,7 @@ private:
 	void destroyTopBarOverride();
 
 	rpl::variable<Wrap> _wrap;
+	std::unique_ptr<Controller> _controller;
 	object_ptr<ContentWidget> _content = { nullptr };
 	object_ptr<Ui::PlainShadow> _topTabsBackground = { nullptr };
 	object_ptr<Ui::SettingsSlider> _topTabs = { nullptr };
diff --git a/Telegram/SourceFiles/info/media/info_media_buttons.h b/Telegram/SourceFiles/info/media/info_media_buttons.h
index bb907255a1..5711985b59 100644
--- a/Telegram/SourceFiles/info/media/info_media_buttons.h
+++ b/Telegram/SourceFiles/info/media/info_media_buttons.h
@@ -25,6 +25,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "lang/lang_keys.h"
 #include "storage/storage_shared_media.h"
 #include "info/info_memento.h"
+#include "info/info_controller.h"
 #include "info/profile/info_profile_button.h"
 #include "info/profile/info_profile_values.h"
 #include "ui/wrap/slide_wrap.h"
@@ -90,11 +91,12 @@ inline auto AddButton(
 		Ui::VerticalLayout *parent,
 		not_null<Window::Controller*> controller,
 		not_null<PeerData*> peer,
+		PeerData *migrated,
 		Type type,
 		Ui::MultiSlideTracker &tracker) {
 	auto result = AddCountedButton(
 		parent,
-		Profile::SharedMediaCountValue(peer, type),
+		Profile::SharedMediaCountValue(peer, migrated, type),
 		MediaText(type),
 		tracker)->entity();
 	result->addClickHandler([controller, peer, type] {
@@ -118,9 +120,7 @@ inline auto AddCommonGroupsButton(
 		tracker)->entity();
 	result->addClickHandler([controller, user] {
 		controller->showSection(
-			Info::Memento(
-				user->id,
-				Section::Type::CommonGroups));
+			Info::Memento(user->id, Section::Type::CommonGroups));
 	});
 	return std::move(result);
 };
diff --git a/Telegram/SourceFiles/info/media/info_media_inner_widget.cpp b/Telegram/SourceFiles/info/media/info_media_inner_widget.cpp
index 2a679cdd80..8cc414d16e 100644
--- a/Telegram/SourceFiles/info/media/info_media_inner_widget.cpp
+++ b/Telegram/SourceFiles/info/media/info_media_inner_widget.cpp
@@ -26,6 +26,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/media/info_media_buttons.h"
 #include "info/profile/info_profile_button.h"
 #include "info/profile/info_profile_icon.h"
+#include "info/info_controller.h"
 #include "ui/widgets/discrete_sliders.h"
 #include "ui/widgets/shadow.h"
 #include "ui/wrap/vertical_layout.h"
@@ -61,17 +62,15 @@ Type TabIndexToType(int index) {
 
 InnerWidget::InnerWidget(
 	QWidget *parent,
-	rpl::producer<Wrap> &&wrap,
-	not_null<Window::Controller*> controller,
-	not_null<PeerData*> peer,
-	Type type)
-: RpWidget(parent) {
-	_list = setupList(controller, peer, type);
-	setupOtherTypes(std::move(wrap));
+	not_null<Controller*> controller)
+: RpWidget(parent)
+, _controller(controller) {
+	_list = setupList();
+	setupOtherTypes();
 }
 
-void InnerWidget::setupOtherTypes(rpl::producer<Wrap> &&wrap) {
-	std::move(wrap)
+void InnerWidget::setupOtherTypes() {
+	_controller->wrapValue()
 		| rpl::start_with_next([this](Wrap value) {
 			if (value == Wrap::Side
 				&& TypeToTabIndex(type())) {
@@ -81,6 +80,7 @@ void InnerWidget::setupOtherTypes(rpl::producer<Wrap> &&wrap) {
 				_otherTypes.destroy();
 				refreshHeight();
 			}
+			refreshSearchField();
 		}, lifetime());
 }
 
@@ -117,8 +117,9 @@ void InnerWidget::createTypeButtons() {
 			const style::icon &icon) {
 		auto result = AddButton(
 			content,
-			controller(),
-			peer(),
+			_controller->window(),
+			_controller->peer(),
+			_controller->migrated(),
 			type,
 			tracker);
 		object_ptr<Profile::FloatingIcon>(
@@ -131,7 +132,7 @@ void InnerWidget::createTypeButtons() {
 			const style::icon &icon) {
 		auto result = AddCommonGroupsButton(
 			content,
-			controller(),
+			_controller->window(),
 			user,
 			tracker);
 		object_ptr<Profile::FloatingIcon>(
@@ -142,7 +143,7 @@ void InnerWidget::createTypeButtons() {
 
 	addMediaButton(Type::MusicFile, st::infoIconMediaAudio);
 	addMediaButton(Type::Link, st::infoIconMediaLink);
-	if (auto user = peer()->asUser()) {
+	if (auto user = _controller->peer()->asUser()) {
 		addCommonGroupsButton(user, st::infoIconMediaGroup);
 	}
 	addMediaButton(Type::VoiceFile, st::infoIconMediaVoice);
@@ -170,20 +171,19 @@ void InnerWidget::createTabs() {
 	_otherTabs->sectionActivated()
 		| rpl::map([](int index) { return TabIndexToType(index); })
 		| rpl::start_with_next(
-			[this](Type type) {
-				if (_list->type() != type) {
-					switchToTab(Memento(peer()->id, type));
+			[this](Type newType) {
+				if (type() != newType) {
+					switchToTab(Memento(
+						_controller->peerId(),
+						_controller->migratedPeerId(),
+						newType));
 				}
 			},
 			_otherTabs->lifetime());
 }
 
-not_null<PeerData*> InnerWidget::peer() const {
-	return _list->peer();
-}
-
 Type InnerWidget::type() const {
-	return _list->type();
+	return _controller->section().mediaType();
 }
 
 void InnerWidget::visibleTopBottomUpdated(
@@ -193,7 +193,7 @@ void InnerWidget::visibleTopBottomUpdated(
 }
 
 bool InnerWidget::showInternal(not_null<Memento*> memento) {
-	if (memento->peerId() != peer()->id) {
+	if (!_controller->validateMementoPeer(memento)) {
 		return false;
 	}
 	auto mementoType = memento->section().mediaType();
@@ -210,8 +210,9 @@ bool InnerWidget::showInternal(not_null<Memento*> memento) {
 }
 
 void InnerWidget::switchToTab(Memento &&memento) {
-	auto type = memento.section().mediaType();
-	_list = setupList(controller(), peer(), type);
+	// Save state of the tab before setSection() call.
+	_controller->setSection(memento.section());
+	_list = setupList();
 	restoreState(&memento);
 	_list->show();
 	_list->resizeToWidth(width());
@@ -219,48 +220,28 @@ void InnerWidget::switchToTab(Memento &&memento) {
 	if (_otherTypes) {
 		_otherTabsShadow->raise();
 		_otherTypes->raise();
-		_otherTabs->setActiveSection(*TypeToTabIndex(type));
+		_otherTabs->setActiveSection(*TypeToTabIndex(type()));
 	}
 }
 
-not_null<Window::Controller*> InnerWidget::controller() const {
-	return _list->controller();
-}
-
-object_ptr<ListWidget> InnerWidget::setupList(
-		not_null<Window::Controller*> controller,
-		not_null<PeerData*> peer,
-		Type type) {
-	if (SharedMediaAllowSearch(type)) {
-		_searchFieldController
-			= std::make_unique<Ui::SearchFieldController>();
-		_searchFieldController->queryValue()
-			| rpl::start_with_next([=](QString &&query) {
-				_searchController.setQuery(produceSearchQuery(
-					peer,
-					type,
-					std::move(query)));
-			}, _searchFieldController->lifetime());
-		_searchField = _searchFieldController->createView(
+void InnerWidget::refreshSearchField() {
+	auto search = _controller->searchFieldController();
+	if (search && _otherTabs) {
+		_searchField = search->createView(
 			this,
 			st::infoMediaSearch);
 		_searchField->resizeToWidth(width());
 		_searchField->show();
 	} else {
 		_searchField = nullptr;
-		_searchFieldController = nullptr;
 	}
-	_searchController.setQueryFast(produceSearchQuery(peer, type));
+}
+
+object_ptr<ListWidget> InnerWidget::setupList() {
+	refreshSearchField();
 	auto result = object_ptr<ListWidget>(
 		this,
-		controller,
-		peer,
-		type,
-		produceListSource());
-	_searchController.sourceChanged()
-		| rpl::start_with_next([widget = result.data()]{
-			widget->restart();
-		}, result->lifetime());
+		_controller);
 	result->heightValue()
 		| rpl::start_with_next(
 			[this] { refreshHeight(); },
@@ -296,47 +277,6 @@ void InnerWidget::cancelSelection() {
 
 InnerWidget::~InnerWidget() = default;
 
-ListWidget::Source InnerWidget::produceListSource() {
-	return [this](
-			SparseIdsMergedSlice::UniversalMsgId aroundId,
-			int limitBefore,
-			int limitAfter) {
-		auto query = _searchController.currentQuery();
-		if (query.query.isEmpty()) {
-			return SharedMediaMergedViewer(
-				SharedMediaMergedKey(
-					SparseIdsMergedSlice::Key(
-						query.peerId,
-						query.migratedPeerId,
-						aroundId),
-					query.type),
-				limitBefore,
-				limitAfter);
-		}
-		return _searchController.idsSlice(
-			aroundId,
-			limitBefore,
-			limitAfter);
-	};
-}
-
-auto InnerWidget::produceSearchQuery(
-		not_null<PeerData*> peer,
-		Type type,
-		QString &&query) const -> SearchQuery {
-	auto result = SearchQuery();
-	result.type = type;
-	result.peerId = peer->id;
-	result.query = std::move(query);
-	result.migratedPeerId = [&] {
-		if (auto migrateFrom = peer->migrateFrom()) {
-			return migrateFrom->id;
-		}
-		return PeerId(0);
-	}();
-	return result;
-}
-
 int InnerWidget::resizeGetHeight(int newWidth) {
 	_inResize = true;
 	auto guard = gsl::finally([this] { _inResize = false; });
diff --git a/Telegram/SourceFiles/info/media/info_media_inner_widget.h b/Telegram/SourceFiles/info/media/info_media_inner_widget.h
index e7d52d2ffd..6dc1d8915c 100644
--- a/Telegram/SourceFiles/info/media/info_media_inner_widget.h
+++ b/Telegram/SourceFiles/info/media/info_media_inner_widget.h
@@ -21,6 +21,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #pragma once
 
 #include "ui/rp_widget.h"
+#include "base/unique_qptr.h"
 #include "info/media/info_media_widget.h"
 #include "info/media/info_media_list_widget.h"
 #include "history/history_search_controller.h"
@@ -32,6 +33,9 @@ class SearchFieldController;
 } // namespace Ui
 
 namespace Info {
+
+class Controller;
+
 namespace Media {
 
 class Memento;
@@ -42,13 +46,7 @@ public:
 	using Type = Widget::Type;
 	InnerWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> &&wrap,
-		not_null<Window::Controller*> controller,
-		not_null<PeerData*> peer,
-		Type type);
-
-	not_null<PeerData*> peer() const;
-	Type type() const;
+		not_null<Controller*> controller);
 
 	bool showInternal(not_null<Memento*> memento);
 
@@ -72,38 +70,29 @@ protected:
 private:
 	int recountHeight();
 	void refreshHeight();
-	void setupOtherTypes(rpl::producer<Wrap> &&wrap);
+	void setupOtherTypes();
 	void createOtherTypes();
 	void createTypeButtons();
 	void createTabs();
 	void switchToTab(Memento &&memento);
 
-	using SearchQuery = Api::DelayedSearchController::Query;
-	ListWidget::Source produceListSource();
-	SearchQuery produceSearchQuery(
-		not_null<PeerData*> peer,
-		Type type,
-		QString &&query = QString()) const;
+	Type type() const;
 
-	not_null<Window::Controller*> controller() const;
+	void refreshSearchField();
+	object_ptr<ListWidget> setupList();
 
-	object_ptr<ListWidget> setupList(
-		not_null<Window::Controller*> controller,
-		not_null<PeerData*> peer,
-		Type type);
-
-	bool _inResize = false;
+	const not_null<Controller*> _controller;
 
 	Ui::SettingsSlider *_otherTabs = nullptr;
 	object_ptr<Ui::VerticalLayout> _otherTypes = { nullptr };
 	object_ptr<Ui::PlainShadow> _otherTabsShadow = { nullptr };
-	std::unique_ptr<Ui::SearchFieldController> _searchFieldController;
-	Ui::RpWidget *_searchField = nullptr;
+	base::unique_qptr<Ui::RpWidget> _searchField = nullptr;
 	object_ptr<ListWidget> _list = { nullptr };
 
+	bool _inResize = false;
+
 	rpl::event_stream<int> _scrollToRequests;
 	rpl::event_stream<rpl::producer<SelectedItems>> _selectedLists;
-	Api::DelayedSearchController _searchController;
 
 };
 
diff --git a/Telegram/SourceFiles/info/media/info_media_list_widget.cpp b/Telegram/SourceFiles/info/media/info_media_list_widget.cpp
index 719386d2f0..05d42d24f4 100644
--- a/Telegram/SourceFiles/info/media/info_media_list_widget.cpp
+++ b/Telegram/SourceFiles/info/media/info_media_list_widget.cpp
@@ -20,6 +20,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 */
 #include "info/media/info_media_list_widget.h"
 
+#include "info/info_controller.h"
 #include "overview/overview_layout.h"
 #include "history/history_media_types.h"
 #include "history/history_item.h"
@@ -538,15 +539,12 @@ void ListWidget::Section::refreshHeight() {
 
 ListWidget::ListWidget(
 	QWidget *parent,
-	not_null<Window::Controller*> controller,
-	not_null<PeerData*> peer,
-	Type type,
-	Source source)
+	not_null<Controller*> controller)
 : RpWidget(parent)
 , _controller(controller)
-, _peer(peer)
-, _type(type)
-, _source(std::move(source))
+, _peer(_controller->peer())
+, _migrated(_controller->migrated())
+, _type(_controller->section().mediaType())
 , _slice(sliceKey(_universalAroundId)) {
 	setAttribute(Qt::WA_MouseTracking);
 	start();
@@ -574,6 +572,10 @@ void ListWidget::start() {
 		| rpl::start_with_next([this](auto item) {
 			repaintItem(item);
 		}, lifetime());
+	_controller->mediaSourceChanged()
+		| rpl::start_with_next([this]{
+			restart();
+		}, lifetime());
 }
 
 void ListWidget::restart() {
@@ -733,13 +735,13 @@ void ListWidget::repaintItem(QRect itemGeometry) {
 
 bool ListWidget::isMyItem(not_null<const HistoryItem*> item) const {
 	auto peer = item->history()->peer;
-	return (_peer == peer || _peer == peer->migrateTo());
+	return (_peer == peer) || (_migrated == peer);
 }
 
 bool ListWidget::isPossiblyMyId(FullMsgId fullId) const {
 	return (fullId.channel != 0)
 		? (_peer->isChannel() && _peer->bareId() == fullId.channel)
-		: (!_peer->isChannel() || _peer->migrateFrom());
+		: (!_peer->isChannel() || _migrated);
 }
 
 bool ListWidget::isItemLayout(
@@ -757,8 +759,8 @@ void ListWidget::invalidatePaletteCache() {
 SparseIdsMergedSlice::Key ListWidget::sliceKey(
 		UniversalMsgId universalId) const {
 	using Key = SparseIdsMergedSlice::Key;
-	if (auto migrateFrom = _peer->migrateFrom()) {
-		return Key(_peer->id, migrateFrom->id, universalId);
+	if (_migrated) {
+		return Key(_peer->id, _migrated->id, universalId);
 	}
 	if (universalId < 0) {
 		// Convert back to plain id for non-migrated histories.
@@ -769,7 +771,10 @@ SparseIdsMergedSlice::Key ListWidget::sliceKey(
 
 void ListWidget::refreshViewer() {
 	_viewerLifetime.destroy();
-	_source(_universalAroundId, _idsLimit, _idsLimit)
+	_controller->mediaSource(
+		sliceKey(_universalAroundId).universalId,
+		_idsLimit,
+		_idsLimit)
 		| rpl::start_with_next([this](
 				SparseIdsMergedSlice &&slice) {
 			_slice = std::move(slice);
@@ -1752,8 +1757,8 @@ void ListWidget::mouseActionStart(const QPoint &screenPos, Qt::MouseButton butto
 	auto pressLayout = _overLayout;
 
 	_mouseAction = MouseAction::None;
-	_pressWasInactive = _controller->window()->wasInactivePress();
-	if (_pressWasInactive) _controller->window()->setInactivePress(false);
+	_pressWasInactive = _controller->window()->window()->wasInactivePress();
+	if (_pressWasInactive) _controller->window()->window()->setInactivePress(false);
 
 	if (ClickHandler::getPressed() && !hasSelected()) {
 		_mouseAction = MouseAction::PrepareDrag;
diff --git a/Telegram/SourceFiles/info/media/info_media_list_widget.h b/Telegram/SourceFiles/info/media/info_media_list_widget.h
index 8a8104fc7c..44c0ca5da9 100644
--- a/Telegram/SourceFiles/info/media/info_media_list_widget.h
+++ b/Telegram/SourceFiles/info/media/info_media_list_widget.h
@@ -39,6 +39,9 @@ class Controller;
 } // namespace Window
 
 namespace Info {
+
+class Controller;
+
 namespace Media {
 
 using BaseLayout = Overview::Layout::ItemBase;
@@ -47,27 +50,9 @@ using UniversalMsgId = int32;
 class ListWidget : public Ui::RpWidget {
 public:
 	using Type = Widget::Type;
-	using Source = base::lambda<
-		rpl::producer<SparseIdsMergedSlice>(
-			SparseIdsMergedSlice::UniversalMsgId aroundId,
-			int limitBefore,
-			int limitAfter)>;
 	ListWidget(
 		QWidget *parent,
-		not_null<Window::Controller*> controller,
-		not_null<PeerData*> peer,
-		Type type,
-		Source source);
-
-	not_null<Window::Controller*> controller() const {
-		return _controller;
-	}
-	not_null<PeerData*> peer() const {
-		return _peer;
-	}
-	Type type() const {
-		return _type;
-	}
+		not_null<Controller*> controller);
 
 	void restart();
 
@@ -103,6 +88,7 @@ protected:
 	void leaveEventHook(QEvent *e) override;
 
 private:
+	using Type = Widget::Type;
 	enum class MouseAction {
 		None,
 		PrepareDrag,
@@ -280,10 +266,10 @@ private:
 	void validateTrippleClickStartTime();
 	void checkMoveToOtherViewer();
 
-	not_null<Window::Controller*> _controller;
-	not_null<PeerData*> _peer;
+	const not_null<Controller*> _controller;
+	const not_null<PeerData*> _peer;
+	PeerData * const _migrated = nullptr;
 	Type _type = Type::Photo;
-	Source _source;
 
 	static constexpr auto kMinimalIdsLimit = 16;
 	static constexpr auto kDefaultAroundId = (ServerMaxMsgId - 1);
diff --git a/Telegram/SourceFiles/info/media/info_media_widget.cpp b/Telegram/SourceFiles/info/media/info_media_widget.cpp
index 9fcc49a924..5dd2b2ca1e 100644
--- a/Telegram/SourceFiles/info/media/info_media_widget.cpp
+++ b/Telegram/SourceFiles/info/media/info_media_widget.cpp
@@ -21,39 +21,41 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/media/info_media_widget.h"
 
 #include "info/media/info_media_inner_widget.h"
+#include "info/info_controller.h"
 #include "ui/widgets/scroll_area.h"
 
 namespace Info {
 namespace Media {
 
+Memento::Memento(not_null<Controller*> controller)
+: Memento(
+	controller->peerId(),
+	controller->migratedPeerId(),
+	controller->section().mediaType()) {
+}
+
+Section Memento::section() const {
+	return Section(_type);
+}
+
 object_ptr<ContentWidget> Memento::createWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		const QRect &geometry) {
 	auto result = object_ptr<Widget>(
 		parent,
-		std::move(wrap),
-		controller,
-		App::peer(peerId()),
-		_type);
+		controller);
 	result->setInternalState(geometry, this);
 	return std::move(result);
 }
 
 Widget::Widget(
 	QWidget *parent,
-	rpl::producer<Wrap> wrap,
-	not_null<Window::Controller*> controller,
-	not_null<PeerData*> peer,
-	Type type)
-: ContentWidget(parent, rpl::duplicate(wrap), controller, peer) {
+	not_null<Controller*> controller)
+: ContentWidget(parent, controller) {
 	_inner = setInnerWidget(object_ptr<InnerWidget>(
 		this,
-		std::move(wrap),
-		controller,
-		peer,
-		type));
+		controller));
 	_inner->scrollToRequests()
 		| rpl::start_with_next([this](int skip) {
 			scrollTo({ skip, -1 });
@@ -68,15 +70,10 @@ void Widget::cancelSelection() {
 	_inner->cancelSelection();
 }
 
-Section Widget::section() const {
-	return Section(type());
-}
-
-Widget::Type Widget::type() const {
-	return _inner->type();
-}
-
 bool Widget::showInternal(not_null<ContentMemento*> memento) {
+	if (!controller()->validateMementoPeer(memento)) {
+		return false;
+	}
 	if (auto mediaMemento = dynamic_cast<Memento*>(memento.get())) {
 		if (_inner->showInternal(mediaMemento)) {
 			return true;
@@ -92,7 +89,7 @@ void Widget::setInternalState(const QRect &geometry, not_null<Memento*> memento)
 }
 
 std::unique_ptr<ContentMemento> Widget::createMemento() {
-	auto result = std::make_unique<Memento>(peer()->id, type());
+	auto result = std::make_unique<Memento>(controller());
 	saveState(result.get());
 	return std::move(result);
 }
diff --git a/Telegram/SourceFiles/info/media/info_media_widget.h b/Telegram/SourceFiles/info/media/info_media_widget.h
index f8f7866859..58d5c44837 100644
--- a/Telegram/SourceFiles/info/media/info_media_widget.h
+++ b/Telegram/SourceFiles/info/media/info_media_widget.h
@@ -33,20 +33,19 @@ class Memento final : public ContentMemento {
 public:
 	using Type = Storage::SharedMediaType;
 
-	Memento(PeerId peerId, Type type)
-	: ContentMemento(peerId)
+	Memento(not_null<Controller*> controller);
+
+	Memento(PeerId peerId, PeerId migratedPeerId, Type type)
+	: ContentMemento(peerId, migratedPeerId)
 	, _type(type) {
 	}
 
 	object_ptr<ContentWidget> createWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		const QRect &geometry) override;
 
-	Section section() const override {
-		return Section(_type);
-	}
+	Section section() const override;
 
 	Type type() const {
 		return _type;
@@ -92,13 +91,7 @@ public:
 
 	Widget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
-		not_null<PeerData*> peer,
-		Type type);
-
-	Type type() const;
-	Section section() const override;
+		not_null<Controller*> controller);
 
 	bool showInternal(
 		not_null<ContentMemento*> memento) override;
@@ -114,7 +107,7 @@ public:
 private:
 	void saveState(not_null<Memento*> memento);
 	void restoreState(not_null<Memento*> memento);
-	
+
 	InnerWidget *_inner = nullptr;
 
 };
diff --git a/Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp b/Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp
index 606a9c7955..b5fb6e3d95 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp
+++ b/Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp
@@ -24,6 +24,8 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include <rpl/combine_previous.h>
 #include <rpl/flatten_latest.h>
 #include "info/info_memento.h"
+#include "info/info_controller.h"
+#include "info/info_top_bar_override.h"
 #include "info/profile/info_profile_button.h"
 #include "info/profile/info_profile_widget.h"
 #include "info/profile/info_profile_text.h"
@@ -32,7 +34,6 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/profile/info_profile_icon.h"
 #include "info/profile/info_profile_members.h"
 #include "info/media/info_media_buttons.h"
-#include "info/info_top_bar_override.h"
 #include "boxes/abstract_box.h"
 #include "boxes/add_contact_box.h"
 #include "boxes/confirm_box.h"
@@ -59,13 +60,12 @@ namespace Profile {
 
 InnerWidget::InnerWidget(
 	QWidget *parent,
-	rpl::producer<Wrap> &&wrapValue,
-	not_null<Window::Controller*> controller,
-	not_null<PeerData*> peer)
+	not_null<Controller*> controller)
 : RpWidget(parent)
 , _controller(controller)
-, _peer(peer)
-, _content(setupContent(this, std::move(wrapValue))) {
+, _peer(_controller->peer())
+, _migrated(_controller->migrated())
+, _content(setupContent(this)) {
 	_content->heightValue()
 		| rpl::start_with_next([this](int height) {
 			resizeToWidth(width());
@@ -84,8 +84,7 @@ rpl::producer<bool> InnerWidget::canHideDetails() const {
 }
 
 object_ptr<Ui::RpWidget> InnerWidget::setupContent(
-		RpWidget *parent,
-		rpl::producer<Wrap> &&wrapValue) {
+		RpWidget *parent) {
 	auto result = object_ptr<Ui::VerticalLayout>(parent);
 	_cover = result->add(object_ptr<Cover>(
 		result,
@@ -101,7 +100,7 @@ object_ptr<Ui::RpWidget> InnerWidget::setupContent(
 	} else {
 		result->add(std::move(details));
 	}
-	result->add(setupSharedMedia(result, rpl::duplicate(wrapValue)));
+	result->add(setupSharedMedia(result));
 	result->add(object_ptr<BoxContentDivider>(result));
 	if (auto user = _peer->asUser()) {
 		result->add(setupUserActions(result, user));
@@ -114,7 +113,6 @@ object_ptr<Ui::RpWidget> InnerWidget::setupContent(
 		_members = result->add(object_ptr<Members>(
 			result,
 			_controller,
-			std::move(wrapValue),
 			_peer)
 		);
 		_members->scrollToRequests()
@@ -241,10 +239,10 @@ void InnerWidget::setupUserButtons(
 	addButton(
 		Lang::Viewer(lng_profile_send_message) | ToUpperValue()
 	)->toggleOn(
-		_controller->historyPeer.value()
+		_controller->window()->historyPeer.value()
 		| rpl::map($1 != user)
 	)->entity()->addClickHandler([this, user] {
-		_controller->showPeerHistory(
+		_controller->window()->showPeerHistory(
 			user,
 			Window::SectionShow::Way::Forward);
 	});
@@ -266,8 +264,7 @@ void InnerWidget::setupUserButtons(
 }
 
 object_ptr<Ui::RpWidget> InnerWidget::setupSharedMedia(
-		RpWidget *parent,
-		rpl::producer<Wrap> &&wrapValue) {
+		RpWidget *parent) {
 	using namespace rpl::mappers;
 	using MediaType = Media::Type;
 
@@ -278,8 +275,9 @@ object_ptr<Ui::RpWidget> InnerWidget::setupSharedMedia(
 			const style::icon &icon) {
 		auto result = Media::AddButton(
 			content,
-			_controller,
-			peer(),
+			_controller->window(),
+			_peer,
+			_migrated,
 			type,
 			tracker);
 		object_ptr<Profile::FloatingIcon>(
@@ -292,7 +290,7 @@ object_ptr<Ui::RpWidget> InnerWidget::setupSharedMedia(
 			const style::icon &icon) {
 		auto result = Media::AddCommonGroupsButton(
 			content,
-			_controller,
+			_controller->window(),
 			user,
 			tracker);
 		object_ptr<Profile::FloatingIcon>(
@@ -306,7 +304,7 @@ object_ptr<Ui::RpWidget> InnerWidget::setupSharedMedia(
 	addMediaButton(MediaType::File, st::infoIconMediaFile);
 	addMediaButton(MediaType::MusicFile, st::infoIconMediaAudio);
 	addMediaButton(MediaType::Link, st::infoIconMediaLink);
-	if (auto user = peer()->asUser()) {
+	if (auto user = _peer->asUser()) {
 		addCommonGroupsButton(user, st::infoIconMediaGroup);
 	}
 	addMediaButton(MediaType::VoiceFile, st::infoIconMediaVoice);
@@ -320,7 +318,7 @@ object_ptr<Ui::RpWidget> InnerWidget::setupSharedMedia(
 	using ToggledData = std::tuple<bool, Wrap, bool>;
 	rpl::combine(
 		tracker.atLeastOneShownValue(),
-		std::move(wrapValue),
+		_controller->wrapValue(),
 		_isStackBottom.events())
 		| rpl::combine_previous(ToggledData())
 		| rpl::start_with_next([wrap = result.data()](
diff --git a/Telegram/SourceFiles/info/profile/info_profile_inner_widget.h b/Telegram/SourceFiles/info/profile/info_profile_inner_widget.h
index 371c26ac15..2daf3e8363 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_inner_widget.h
+++ b/Telegram/SourceFiles/info/profile/info_profile_inner_widget.h
@@ -37,6 +37,7 @@ struct ScrollToRequest;
 namespace Info {
 
 enum class Wrap;
+class Controller;
 
 namespace Profile {
 
@@ -48,13 +49,7 @@ class InnerWidget final : public Ui::RpWidget {
 public:
 	InnerWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> &&wrapValue,
-		not_null<Window::Controller*> controller,
-		not_null<PeerData*> peer);
-
-	not_null<PeerData*> peer() const {
-		return _peer;
-	}
+		not_null<Controller*> controller);
 
 	void saveState(not_null<Memento*> memento);
 	void restoreState(not_null<Memento*> memento);
@@ -77,13 +72,9 @@ protected:
 		int visibleBottom) override;
 
 private:
-	object_ptr<RpWidget> setupContent(
-		RpWidget *parent,
-		rpl::producer<Wrap> &&wrapValue);
+	object_ptr<RpWidget> setupContent(RpWidget *parent);
 	object_ptr<RpWidget> setupDetails(RpWidget *parent) const;
-	object_ptr<RpWidget> setupSharedMedia(
-		RpWidget *parent,
-		rpl::producer<Wrap> &&wrapValue);
+	object_ptr<RpWidget> setupSharedMedia(RpWidget *parent);
 	object_ptr<RpWidget> setupMuteToggle(RpWidget *parent) const;
 	object_ptr<RpWidget> setupInfo(RpWidget *parent) const;
 	void setupUserButtons(
@@ -105,8 +96,9 @@ private:
 
 	rpl::event_stream<bool> _isStackBottom;
 
-	not_null<Window::Controller*> _controller;
-	not_null<PeerData*> _peer;
+	const not_null<Controller*> _controller;
+	const not_null<PeerData*> _peer;
+	PeerData * const _migrated = nullptr;
 
 	Members *_members = nullptr;
 	Cover *_cover = nullptr;
diff --git a/Telegram/SourceFiles/info/profile/info_profile_members.cpp b/Telegram/SourceFiles/info/profile/info_profile_members.cpp
index e6e5426e0b..19fa9fe5e4 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_members.cpp
+++ b/Telegram/SourceFiles/info/profile/info_profile_members.cpp
@@ -27,6 +27,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "info/profile/info_profile_values.h"
 #include "info/profile/info_profile_members_controllers.h"
 #include "info/info_content_widget.h"
+#include "info/info_controller.h"
 #include "profile/profile_block_group_members.h"
 #include "ui/widgets/labels.h"
 #include "ui/widgets/buttons.h"
@@ -48,12 +49,11 @@ constexpr auto kEnableSearchMembersAfterCount = 50;
 
 Members::Members(
 	QWidget *parent,
-	not_null<Window::Controller*> controller,
-	rpl::producer<Wrap> &&wrapValue,
+	not_null<Controller*> controller,
 	not_null<PeerData*> peer)
 : RpWidget(parent)
 , _peer(peer)
-, _listController(CreateMembersController(controller, _peer))
+, _listController(CreateMembersController(controller->window(), _peer))
 , _labelWrap(this)
 , _label(setupHeader())
 , _addMember(this, st::infoMembersAddMember)
@@ -65,7 +65,7 @@ Members::Members(
 , _cancelSearch(this, st::infoMembersCancelSearch)
 , _list(setupList(this, _listController.get())) {
 	setupButtons();
-	std::move(wrapValue)
+	controller->wrapValue()
 		| rpl::start_with_next([this](Wrap wrap) {
 			_wrap = wrap;
 			updateSearchOverrides();
diff --git a/Telegram/SourceFiles/info/profile/info_profile_members.h b/Telegram/SourceFiles/info/profile/info_profile_members.h
index 6902b9bdcf..d12b5453b3 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_members.h
+++ b/Telegram/SourceFiles/info/profile/info_profile_members.h
@@ -38,6 +38,7 @@ class ParticipantsBoxController;
 
 namespace Info {
 
+class Controller;
 enum class Wrap;
 
 namespace Profile {
@@ -50,8 +51,7 @@ class Members
 public:
 	Members(
 		QWidget *parent,
-		not_null<Window::Controller*> controller,
-		rpl::producer<Wrap> &&wrapValue,
+		not_null<Controller*> controller,
 		not_null<PeerData*> peer);
 
 	rpl::producer<Ui::ScrollToRequest> scrollToRequests() const {
diff --git a/Telegram/SourceFiles/info/profile/info_profile_values.cpp b/Telegram/SourceFiles/info/profile/info_profile_values.cpp
index a78cd2e0bb..133b18ee2c 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_values.cpp
+++ b/Telegram/SourceFiles/info/profile/info_profile_values.cpp
@@ -164,17 +164,14 @@ rpl::producer<int> MembersCountValue(
 
 rpl::producer<int> SharedMediaCountValue(
 		not_null<PeerData*> peer,
+		PeerData *migrated,
 		Storage::SharedMediaType type) {
-	auto real = peer->migrateTo() ? peer->migrateTo() : peer;
-	auto migrated = real->migrateFrom()
-		? real->migrateFrom()
-		: nullptr;
 	auto aroundId = 0;
 	auto limit = 0;
 	auto updated = SharedMediaMergedViewer(
 		SharedMediaMergedKey(
 			SparseIdsMergedSlice::Key(
-				real->id,
+				peer->id,
 				migrated ? migrated->id : 0,
 				aroundId),
 			type),
diff --git a/Telegram/SourceFiles/info/profile/info_profile_values.h b/Telegram/SourceFiles/info/profile/info_profile_values.h
index 5d5fc55cbe..5702ac0a61 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_values.h
+++ b/Telegram/SourceFiles/info/profile/info_profile_values.h
@@ -67,6 +67,7 @@ rpl::producer<int> MembersCountValue(
 	not_null<PeerData*> peer);
 rpl::producer<int> SharedMediaCountValue(
 	not_null<PeerData*> peer,
+	PeerData *migrated,
 	Storage::SharedMediaType type);
 rpl::producer<int> CommonGroupsCountValue(
 	not_null<UserData*> user);
diff --git a/Telegram/SourceFiles/info/profile/info_profile_widget.cpp b/Telegram/SourceFiles/info/profile/info_profile_widget.cpp
index 28b8b89d44..bb09458da4 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_widget.cpp
+++ b/Telegram/SourceFiles/info/profile/info_profile_widget.cpp
@@ -22,35 +22,39 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 
 #include "info/profile/info_profile_inner_widget.h"
 #include "ui/widgets/scroll_area.h"
+#include "info/info_controller.h"
 
 namespace Info {
 namespace Profile {
 
+Memento::Memento(not_null<Controller*> controller)
+: Memento(
+	controller->peerId(),
+	controller->migratedPeerId()) {
+}
+
+Section Memento::section() const {
+	return Section(Section::Type::Profile);
+}
+
 object_ptr<ContentWidget> Memento::createWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		const QRect &geometry) {
 	auto result = object_ptr<Widget>(
 		parent,
-		std::move(wrap),
-		controller,
-		App::peer(peerId()));
+		controller);
 	result->setInternalState(geometry, this);
 	return std::move(result);
 }
 
 Widget::Widget(
 	QWidget *parent,
-	rpl::producer<Wrap> wrap,
-	not_null<Window::Controller*> controller,
-	not_null<PeerData*> peer)
-: ContentWidget(parent, rpl::duplicate(wrap), controller, peer) {
+	not_null<Controller*> controller)
+: ContentWidget(parent, controller) {
 	_inner = setInnerWidget(object_ptr<InnerWidget>(
 		this,
-		std::move(wrap),
-		controller,
-		peer));
+		controller));
 	_inner->move(0, 0);
 	_inner->scrollToRequests()
 		| rpl::start_with_next([this](Ui::ScrollToRequest request) {
@@ -67,20 +71,17 @@ void Widget::setIsStackBottom(bool isStackBottom) {
 	_inner->setIsStackBottom(isStackBottom);
 }
 
-Section Widget::section() const {
-	return Section(Section::Type::Profile);
-}
-
 void Widget::setInnerFocus() {
 	_inner->setFocus();
 }
 
 bool Widget::showInternal(not_null<ContentMemento*> memento) {
+	if (!controller()->validateMementoPeer(memento)) {
+		return false;
+	}
 	if (auto profileMemento = dynamic_cast<Memento*>(memento.get())) {
-		if (profileMemento->peerId() == peer()->id) {
-			restoreState(profileMemento);
-			return true;
-		}
+		restoreState(profileMemento);
+		return true;
 	}
 	return false;
 }
@@ -92,7 +93,7 @@ void Widget::setInternalState(const QRect &geometry, not_null<Memento*> memento)
 }
 
 std::unique_ptr<ContentMemento> Widget::createMemento() {
-	auto result = std::make_unique<Memento>(peer()->id);
+	auto result = std::make_unique<Memento>(controller());
 	saveState(result.get());
 	return std::move(result);
 }
diff --git a/Telegram/SourceFiles/info/profile/info_profile_widget.h b/Telegram/SourceFiles/info/profile/info_profile_widget.h
index 40b087987d..0a129826c1 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_widget.h
+++ b/Telegram/SourceFiles/info/profile/info_profile_widget.h
@@ -31,18 +31,17 @@ class InnerWidget;
 
 class Memento final : public ContentMemento {
 public:
-	Memento(PeerId peerId) : ContentMemento(peerId) {
+	Memento(not_null<Controller*> controller);
+	Memento(PeerId peerId, PeerId migratedPeerId)
+	: ContentMemento(peerId, migratedPeerId) {
 	}
 
 	object_ptr<ContentWidget> createWidget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
+		not_null<Controller*> controller,
 		const QRect &geometry) override;
 
-	Section section() const override {
-		return Section(Section::Type::Profile);
-	}
+	Section section() const override;
 
 	void setInfoExpanded(bool expanded) {
 		_infoExpanded = expanded;
@@ -74,12 +73,9 @@ class Widget final : public ContentWidget {
 public:
 	Widget(
 		QWidget *parent,
-		rpl::producer<Wrap> wrap,
-		not_null<Window::Controller*> controller,
-		not_null<PeerData*> peer);
+		not_null<Controller*> controller);
 
 	void setIsStackBottom(bool isStackBottom) override;
-	Section section() const override;
 
 	bool showInternal(
 		not_null<ContentMemento*> memento) override;
diff --git a/Telegram/SourceFiles/rpl/event_stream.h b/Telegram/SourceFiles/rpl/event_stream.h
index c1b517a441..969ad38e1a 100644
--- a/Telegram/SourceFiles/rpl/event_stream.h
+++ b/Telegram/SourceFiles/rpl/event_stream.h
@@ -50,17 +50,19 @@ public:
 	}
 	auto events() const {
 		return make_producer<Value>([weak = weak()](
-			const auto &consumer) {
+				const auto &consumer) {
 			if (auto strong = weak.lock()) {
 				auto result = [weak, consumer] {
 					if (auto strong = weak.lock()) {
-						auto it = base::find(*strong, consumer);
-						if (it != strong->end()) {
+						auto it = base::find(
+							strong->consumers,
+							consumer);
+						if (it != strong->consumers.end()) {
 							it->terminate();
 						}
 					}
 				};
-				strong->push_back(std::move(consumer));
+				strong->consumers.push_back(std::move(consumer));
 				return lifetime(std::move(result));
 			}
 			return lifetime();
@@ -76,9 +78,13 @@ public:
 	~event_stream();
 
 private:
-	std::weak_ptr<std::vector<consumer<Value, no_error>>> weak() const;
+	struct Data {
+		std::vector<consumer<Value, no_error>> consumers;
+		int depth = 0;
+	};
+	std::weak_ptr<Data> weak() const;
 
-	mutable std::shared_ptr<std::vector<consumer<Value, no_error>>> _consumers;
+	mutable std::shared_ptr<Data> _data;
 
 };
 
@@ -88,13 +94,13 @@ inline event_stream<Value>::event_stream() {
 
 template <typename Value>
 inline event_stream<Value>::event_stream(event_stream &&other)
-: _consumers(base::take(other._consumers)) {
+: _data(base::take(other._data)) {
 }
 
 template <typename Value>
 inline event_stream<Value> &event_stream<Value>::operator=(
 		event_stream &&other) {
-	_consumers = base::take(other._consumers);
+	_data = base::take(other._data);
 	return *this;
 }
 
@@ -102,11 +108,13 @@ template <typename Value>
 template <typename OtherValue>
 inline void event_stream<Value>::fire_forward(
 		OtherValue &&value) const {
-	if (!_consumers) {
+	auto copy = _data;
+	if (!copy) {
 		return;
 	}
 
-	auto &consumers = *_consumers;
+	++copy->depth;
+	auto &consumers = copy->consumers;
 	auto begin = base::index_based_begin(consumers);
 	auto end = base::index_based_end(consumers);
 	if (begin != end) {
@@ -136,24 +144,28 @@ inline void event_stream<Value>::fire_forward(
 			}
 
 			// Erase stale consumers.
-			consumers.erase(removeFrom.base(), consumers.end());
+			if (copy->depth == 1) {
+				consumers.erase(removeFrom.base(), consumers.end());
+			}
 		}
 	}
+	--copy->depth;
 }
 
 template <typename Value>
-inline std::weak_ptr<std::vector<consumer<Value, no_error>>> event_stream<Value>::weak() const {
-	if (!_consumers) {
-		_consumers = std::make_shared<std::vector<consumer<Value, no_error>>>();
+inline auto event_stream<Value>::weak() const
+-> std::weak_ptr<Data> {
+	if (!_data) {
+		_data = std::make_shared<Data>();
 	}
-	return _consumers;
+	return _data;
 }
 
 
 template <typename Value>
 inline event_stream<Value>::~event_stream() {
-	if (auto consumers = base::take(_consumers)) {
-		for (auto &consumer : *consumers) {
+	if (auto data = base::take(_data)) {
+		for (auto &consumer : data->consumers) {
 			consumer.put_done();
 		}
 	}
diff --git a/Telegram/SourceFiles/rpl/variable.h b/Telegram/SourceFiles/rpl/variable.h
index d7d5ae5182..049a468798 100644
--- a/Telegram/SourceFiles/rpl/variable.h
+++ b/Telegram/SourceFiles/rpl/variable.h
@@ -81,6 +81,9 @@ public:
 	auto value() const {
 		return _changes.events_starting_with_copy(_data);
 	}
+	auto changes() const {
+		return _changes.events();
+	}
 
 private:
 	template <typename A, typename B>
diff --git a/Telegram/SourceFiles/ui/search_field_controller.cpp b/Telegram/SourceFiles/ui/search_field_controller.cpp
index aa521360ca..5222fa42ab 100644
--- a/Telegram/SourceFiles/ui/search_field_controller.cpp
+++ b/Telegram/SourceFiles/ui/search_field_controller.cpp
@@ -29,20 +29,20 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 
 namespace Ui {
 
-object_ptr<Ui::RpWidget> SearchFieldController::createView(
+base::unique_qptr<Ui::RpWidget> SearchFieldController::createView(
 		QWidget *parent,
 		const style::SearchFieldRow &st) {
-	auto result = object_ptr<Ui::FixedHeightWidget>(
+	auto result = base::make_unique_q<Ui::FixedHeightWidget>(
 		parent,
 		st.height);
 
 	auto cancel = CreateChild<Ui::CrossButton>(
-		result.data(),
+		result.get(),
 		st.fieldCancel);
 	cancel->addClickHandler([=] { clearQuery(); });
 
 	auto field = CreateChild<Ui::InputField>(
-		result.data(),
+		result.get(),
 		st.field,
 		langFactory(lng_dlg_filter),
 		_query.current());
@@ -54,7 +54,7 @@ object_ptr<Ui::RpWidget> SearchFieldController::createView(
 		clearQuery();
 	});
 
-	auto shadow = CreateChild<Ui::PlainShadow>(result.data());
+	auto shadow = CreateChild<Ui::PlainShadow>(result.get());
 	shadow->show();
 
 	result->widthValue()
@@ -84,7 +84,7 @@ object_ptr<Ui::RpWidget> SearchFieldController::createView(
 				_view.wrap->width());
 		}, result->lifetime());
 
-	_view.wrap.reset(result);
+	_view.wrap.reset(result.get());
 	_view.cancel = cancel;
 	_view.field = field;
 	return std::move(result);
diff --git a/Telegram/SourceFiles/ui/search_field_controller.h b/Telegram/SourceFiles/ui/search_field_controller.h
index 98020989f5..5dff1db2be 100644
--- a/Telegram/SourceFiles/ui/search_field_controller.h
+++ b/Telegram/SourceFiles/ui/search_field_controller.h
@@ -35,7 +35,7 @@ class InputField;
 
 class SearchFieldController {
 public:
-	object_ptr<Ui::RpWidget> createView(
+	base::unique_qptr<Ui::RpWidget> createView(
 		QWidget *parent,
 		const style::SearchFieldRow &st);
 
diff --git a/Telegram/gyp/telegram_sources.txt b/Telegram/gyp/telegram_sources.txt
index 0664c3e5e7..abcbe4a820 100644
--- a/Telegram/gyp/telegram_sources.txt
+++ b/Telegram/gyp/telegram_sources.txt
@@ -219,6 +219,8 @@
 <(src_loc)/info/info_common_groups_widget.h
 <(src_loc)/info/info_content_widget.cpp
 <(src_loc)/info/info_content_widget.h
+<(src_loc)/info/info_controller.cpp
+<(src_loc)/info/info_controller.h
 <(src_loc)/info/info_layer_widget.cpp
 <(src_loc)/info/info_layer_widget.h
 <(src_loc)/info/info_memento.cpp