Implement simple chats search bar.

Telegram/Resources/langs/lang.strings

@@ -5174,6 +5174,17 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_font_system" = "System font";
 "lng_font_not_found" = "Font not found.";
 
+"lng_search_tab_my_messages" = "My Messages";
+"lng_search_tab_this_topic" = "This Topic";
+"lng_search_tab_this_chat" = "This Chat";
+"lng_search_tab_this_channel" = "This Channel";
+"lng_search_tab_this_group" = "This Group";
+"lng_search_tab_public_posts" = "Public Posts";
+"lng_search_tab_no_results" = "No Results";
+"lng_search_tab_no_results_text" = "There were no results for \"{query}\".";
+"lng_search_tab_no_results_retry" = "Try another hashtag.";
+"lng_search_tab_by_hashtag" = "Enter a hashtag to find messages containing it.";
+
 // Wnd specific
 
 "lng_wnd_choose_program_menu" = "Choose Default Program...";

Telegram/SourceFiles/boxes/peers/edit_forum_topic_box.cpp

@@ -42,10 +42,7 @@ namespace {
 
 constexpr auto kDefaultIconId = DocumentId(0x7FFF'FFFF'FFFF'FFFFULL);
 
-struct DefaultIcon {
-	QString title;
-	int32 colorId = 0;
-};
+using DefaultIcon = Data::TopicIconDescriptor;
 
 class DefaultIconEmoji final : public Ui::Text::CustomEmoji {
 public:
@@ -89,10 +86,14 @@ QString DefaultIconEmoji::entityData() {
 
 void DefaultIconEmoji::paint(QPainter &p, const Context &context) {
 	if (_image.isNull()) {
-		_image = Data::ForumTopicIconFrame(
-			_icon.colorId,
-			_icon.title,
-			st::defaultForumTopicIcon);
+		_image = Data::IsForumGeneralIconTitle(_icon.title)
+			? Data::ForumTopicGeneralIconFrame(
+				st::defaultForumTopicIcon.size,
+				Data::ParseForumGeneralIconColor(_icon.colorId))
+			: Data::ForumTopicIconFrame(
+				_icon.colorId,
+				_icon.title,
+				st::defaultForumTopicIcon);
 	}
 	const auto esize = Ui::Emoji::GetSizeLarge() / style::DevicePixelRatio();
 	const auto customSize = Ui::Text::AdjustCustomEmojiSize(esize);
@@ -212,7 +213,7 @@ bool DefaultIconEmoji::readyInDefaultState() {
 	) | rpl::start_with_next([=] {
 		state->frame = Data::ForumTopicGeneralIconFrame(
 			st::largeForumTopicIcon.size,
-			st::windowSubTextFg);
+			st::windowSubTextFg->c);
 		result->update();
 	}, result->lifetime());
 
@@ -261,7 +262,7 @@ struct IconSelector {
 		if (id == kDefaultIconId) {
 			return std::make_unique<DefaultIconEmoji>(
 				rpl::duplicate(defaultIcon),
-				repaint);
+				std::move(repaint));
 		}
 		return manager->create(id, std::move(repaint), tag);
 	};
@@ -572,3 +573,11 @@ void EditForumTopicBox(
 		box->closeBox();
 	});
 }
+
+std::unique_ptr<Ui::Text::CustomEmoji> MakeTopicIconEmoji(
+		Data::TopicIconDescriptor descriptor,
+		Fn<void()> repaint) {
+	return std::make_unique<DefaultIconEmoji>(
+		rpl::single(descriptor),
+		std::move(repaint));
+}

Telegram/SourceFiles/boxes/peers/edit_forum_topic_box.h

@@ -11,6 +11,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 class History;
 
+namespace Data {
+struct TopicIconDescriptor;
+} // namespace Data
+
 namespace Window {
 class SessionController;
 } // namespace Window
@@ -25,3 +29,7 @@ void EditForumTopicBox(
 	not_null<Window::SessionController*> controller,
 	not_null<History*> forum,
 	MsgId rootId);
+
+[[nodiscard]] std::unique_ptr<Ui::Text::CustomEmoji> MakeTopicIconEmoji(
+	Data::TopicIconDescriptor descriptor,
+	Fn<void()> repaint);

Telegram/SourceFiles/data/data_forum_topic.cpp

@@ -143,7 +143,7 @@ QImage ForumTopicIconFrame(
 	return background;
 }
 
-QImage ForumTopicGeneralIconFrame(int size, const style::color &color) {
+QImage ForumTopicGeneralIconFrame(int size, const QColor &color) {
 	const auto ratio = style::DevicePixelRatio();
 	auto svg = QSvgRenderer(ForumTopicIconPath(u"general"_q));
 	auto result = QImage(
@@ -172,6 +172,62 @@ TextWithEntities ForumTopicIconWithTitle(
 		: TextWithEntities{ title };
 }
 
+QString ForumGeneralIconTitle() {
+	return QChar(0) + u"general"_q;
+}
+
+bool IsForumGeneralIconTitle(const QString &title) {
+	return !title.isEmpty() && !title[0].unicode();
+}
+
+int32 ForumGeneralIconColor(const QColor &color) {
+	return int32(uint32(color.red()) << 16
+		| uint32(color.green()) << 8
+		| uint32(color.blue())
+		| (uint32(color.alpha() == 255 ? 0 : color.alpha()) << 24));
+}
+
+QColor ParseForumGeneralIconColor(int32 value) {
+	const auto alpha = uint32(value) >> 24;
+	return QColor(
+		(value >> 16) & 0xFF,
+		(value >> 8) & 0xFF,
+		value & 0xFF,
+		alpha ? alpha : 255);
+}
+
+QString TopicIconEmojiEntity(TopicIconDescriptor descriptor) {
+	return IsForumGeneralIconTitle(descriptor.title)
+		? u"topic_general:"_q + QString::number(uint32(descriptor.colorId))
+		: (u"topic_icon:"_q
+			+ QString::number(uint32(descriptor.colorId))
+			+ ' '
+			+ ExtractNonEmojiLetter(descriptor.title));
+}
+
+TopicIconDescriptor ParseTopicIconEmojiEntity(QStringView entity) {
+	if (!entity.startsWith(u"topic_")) {
+		return {};
+	}
+	const auto general = u"topic_general:"_q;
+	const auto normal = u"topic_icon:"_q;
+	if (entity.startsWith(general)) {
+		return {
+			.title = ForumGeneralIconTitle(),
+			.colorId = int32(entity.mid(general.size()).toUInt()),
+		};
+	} else if (entity.startsWith(normal)) {
+		const auto parts = entity.mid(normal.size()).split(' ');
+		if (parts.size() == 2) {
+			return {
+				.title = parts[1].toString(),
+				.colorId = int32(parts[0].toUInt()),
+			};
+		}
+	}
+	return {};
+}
+
 ForumTopic::ForumTopic(not_null<Forum*> forum, MsgId rootId)
 : Thread(&forum->history()->owner(), Type::ForumTopic)
 , _forum(forum)
@@ -640,7 +696,7 @@ void ForumTopic::validateGeneralIcon(
 		: context.selected
 		? st::dialogsTextFgOver
 		: st::dialogsTextFg;
-	_defaultIcon = ForumTopicGeneralIconFrame(size, color);
+	_defaultIcon = ForumTopicGeneralIconFrame(size, color->c);
 	_flags = (_flags & ~mask) | flags;
 }
 

Telegram/SourceFiles/data/data_forum_topic.h

@@ -48,12 +48,33 @@ class Forum;
 	const style::ForumTopicIcon &st);
 [[nodiscard]] QImage ForumTopicGeneralIconFrame(
 	int size,
-	const style::color &color);
+	const QColor &color);
 [[nodiscard]] TextWithEntities ForumTopicIconWithTitle(
 	MsgId rootId,
 	DocumentId iconId,
 	const QString &title);
 
+[[nodiscard]] QString ForumGeneralIconTitle();
+[[nodiscard]] bool IsForumGeneralIconTitle(const QString &title);
+[[nodiscard]] int32 ForumGeneralIconColor(const QColor &color);
+[[nodiscard]] QColor ParseForumGeneralIconColor(int32 value);
+
+struct TopicIconDescriptor {
+	QString title;
+	int32 colorId = 0;
+
+	[[nodiscard]] bool empty() const {
+		return !colorId && title.isEmpty();
+	}
+	explicit operator bool() const {
+		return !empty();
+	}
+};
+
+[[nodiscard]] QString TopicIconEmojiEntity(TopicIconDescriptor descriptor);
+[[nodiscard]] TopicIconDescriptor ParseTopicIconEmojiEntity(
+	QStringView entity);
+
 class ForumTopic final : public Thread {
 public:
 	static constexpr auto kGeneralId = 1;

Telegram/SourceFiles/data/stickers/data_custom_emoji.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "data/stickers/data_custom_emoji.h"
 
+#include "boxes/peers/edit_forum_topic_box.h" // MakeTopicIconEmoji.
 #include "chat_helpers/stickers_emoji_pack.h"
 #include "main/main_app_config.h"
 #include "main/main_session.h"
@@ -15,6 +16,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_document.h"
 #include "data/data_document_media.h"
 #include "data/data_file_origin.h"
+#include "data/data_forum_topic.h" // ParseTopicIconEmojiEntity.
 #include "data/data_peer.h"
 #include "data/data_message_reactions.h"
 #include "data/stickers/data_stickers.h"
@@ -539,6 +541,8 @@ std::unique_ptr<Ui::Text::CustomEmoji> CustomEmojiManager::create(
 		const auto ratio = style::DevicePixelRatio();
 		const auto size = EmojiSizeFromTag(tag) / ratio;
 		return userpic(data, std::move(update), size);
+	} else if (const auto parsed = Data::ParseTopicIconEmojiEntity(data)) {
+		return MakeTopicIconEmoji(parsed, std::move(update));
 	}
 	const auto parsed = ParseCustomEmojiData(data);
 	return parsed

Telegram/SourceFiles/dialogs/dialogs_widget.cpp

@@ -9,6 +9,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "base/qt/qt_key_modifiers.h"
 #include "base/options.h"
+#include "dialogs/ui/chat_search_tabs.h"
 #include "dialogs/ui/dialogs_stories_content.h"
 #include "dialogs/ui/dialogs_stories_list.h"
 #include "dialogs/ui/dialogs_suggestions.h"
@@ -23,6 +24,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_requests_bar.h"
 #include "history/view/history_view_group_call_bar.h"
 #include "boxes/peers/edit_peer_requests_box.h"
+#include "ui/text/text_utilities.h"
 #include "ui/widgets/buttons.h"
 #include "ui/widgets/elastic_scroll.h"
 #include "ui/widgets/fields/input_field.h"
@@ -62,6 +64,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_session.h"
 #include "data/data_channel.h"
 #include "data/data_chat.h"
+#include "data/stickers/data_custom_emoji.h"
 #include "data/data_user.h"
 #include "data/data_folder.h"
 #include "data/data_forum.h"
@@ -1075,6 +1078,9 @@ void Widget::updateControlsVisibility(bool fast) {
 		updateJumpToDateVisibility(fast);
 		updateSearchFromVisibility(fast);
 	}
+	if (_searchTabs) {
+		_searchTabs->show();
+	}
 	if (_connecting) {
 		_connecting->setForceHidden(false);
 	}
@@ -1218,6 +1224,114 @@ void Widget::updateSuggestions(anim::type animated) {
 	}
 }
 
+void Widget::updateSearchTabs() {
+	const auto has = _searchInChat
+		|| _hiddenSearchInChat
+		|| _searchingHashtag;
+	if (!has) {
+		_searchTab = ChatSearchTab::MyMessages;
+		if (_searchTabs) {
+			_searchTabs = nullptr;
+			updateControlsGeometry();
+		}
+		return;
+	} else if (!_searchTabs) {
+		_searchTabs = std::make_unique<ChatSearchTabs>(this, _searchTab);
+		_searchTabs->setVisible(!_showAnimation);
+		_searchTabs->tabChanges(
+		) | rpl::start_with_next([=](ChatSearchTab tab) {
+			if (_searchTab != tab) {
+				_searchTab = tab;
+				applySearchTab();
+			}
+		}, _searchTabs->lifetime());
+	}
+	const auto topic = _searchInChat.topic()
+		? _searchInChat.topic()
+		: _hiddenSearchInChat.topic();
+	const auto peer = _searchInChat.owningHistory()
+		? _searchInChat.owningHistory()->peer.get()
+		: _hiddenSearchInChat.owningHistory()
+		? _hiddenSearchInChat.owningHistory()->peer.get()
+		: nullptr;
+	const auto topicShortLabel = topic
+		? Ui::Text::SingleCustomEmoji(Data::TopicIconEmojiEntity({
+			.title = (topic->isGeneral()
+				? Data::ForumGeneralIconTitle()
+				: topic->title()),
+			.colorId = (topic->isGeneral()
+				? Data::ForumGeneralIconColor(st::windowSubTextFg->c)
+				: topic->colorId()),
+			}))
+		: TextWithEntities();
+	const auto peerShortLabel = peer
+		? Ui::Text::SingleCustomEmoji(
+			session().data().customEmojiManager().peerUserpicEmojiData(
+				peer))
+		: TextWithEntities();
+	const auto myShortLabel = DefaultShortLabel(ChatSearchTab::MyMessages);
+	const auto publicShortLabel = _searchingHashtag
+		? DefaultShortLabel(ChatSearchTab::PublicPosts)
+		: TextWithEntities();
+	_searchTab = _searchInChat.topic()
+		? ChatSearchTab::ThisTopic
+		: _searchInChat.owningHistory()
+		? ChatSearchTab::ThisPeer
+		: (_searchingHashtag && _searchTab == ChatSearchTab::PublicPosts)
+		? ChatSearchTab::PublicPosts
+		: ChatSearchTab::MyMessages;
+	_searchTabs->setTabShortLabels({
+		{ ChatSearchTab::ThisTopic, topicShortLabel },
+		{ ChatSearchTab::ThisPeer, peerShortLabel },
+		{ ChatSearchTab::MyMessages, myShortLabel },
+		{ ChatSearchTab::PublicPosts, publicShortLabel },
+	}, _searchTab);
+
+	updateControlsGeometry();
+}
+
+void Widget::applySearchTab() {
+	switch (_searchTab) {
+	case ChatSearchTab::ThisTopic:
+		if (_searchInChat.topic()) {
+		} else if (_hiddenSearchInChat.topic()) {
+			setSearchInChat(
+				base::take(_hiddenSearchInChat),
+				base::take(_hiddenSearchFromAuthor),
+				base::take(_hiddenSearchTags));
+		} else {
+			updateSearchTabs();
+		}
+	case ChatSearchTab::ThisPeer:
+		if (_searchInChat.topic()) {
+			_hiddenSearchInChat = _searchInChat;
+			_hiddenSearchFromAuthor = _searchFromAuthor;
+			_hiddenSearchTags = _searchTags;
+			setSearchInChat(
+				_searchInChat.owningHistory(),
+				_searchFromAuthor,
+				_searchTags);
+		} else if (_searchInChat) {
+			return;
+		} else if (_hiddenSearchInChat) {
+			setSearchInChat(
+				_hiddenSearchInChat.owningHistory(),
+				_hiddenSearchFromAuthor,
+				_hiddenSearchTags);
+		}
+	case ChatSearchTab::MyMessages:
+		if (_searchInChat) {
+			_hiddenSearchInChat = (_hiddenSearchInChat.topic()
+				&& _hiddenSearchInChat.owningHistory() == _searchInChat.history())
+				? _hiddenSearchInChat
+				: _searchInChat;
+			_hiddenSearchFromAuthor = _searchFromAuthor;
+			_hiddenSearchTags = _searchTags;
+			setSearchInChat({});
+		}
+	}
+}
+
 void Widget::changeOpenedSubsection(
 		FnMut<void()> change,
 		bool fromRight,
@@ -2619,8 +2733,31 @@ void Widget::updateCancelSearch() {
 	_cancelSearch->toggle(shown, anim::type::normal);
 }
 
+bool Widget::fixSearchQuery() {
+	if (_fixingSearchQuery) {
+		return false;
+	}
+	_fixingSearchQuery = true;
+	const auto query = _search->getLastText();
+	if (_searchTab == ChatSearchTab::PublicPosts) {
+		const auto fixed = FixHashtagSearchQuery(
+			query,
+			_search->textCursor().position());
+		if (fixed.text != query) {
+			_search->setText(fixed.text);
+			_search->setCursorPosition(fixed.cursorPosition);
+		}
+		_searchingHashtag = true;
+	} else if (_searchingHashtag != IsHashtagSearchQuery(query)) {
+		_searchingHashtag = !_searchingHashtag;
+		updateSearchTabs();
+	}
+	_fixingSearchQuery = false;
+	return true;
+}
+
 void Widget::applySearchUpdate(bool force) {
-	if (_showAnimation && !force) {
+	if (!fixSearchQuery() || (_showAnimation && !force)) {
 		return;
 	}
 
@@ -2852,8 +2989,17 @@ bool Widget::setSearchInChat(
 	}
 	if (searchInPeerUpdated) {
 		_searchInChat = chat;
+		if (chat) {
+			_hiddenSearchFromAuthor = {};
+			_hiddenSearchTags = {};
+			const auto hiddenTopic = _hiddenSearchInChat.topic();
+			if (!hiddenTopic || hiddenTopic->history() != chat.history()) {
+				_hiddenSearchInChat = {};
+			}
+		}
 		controller()->setSearchInChat(_searchInChat);
 		updateSuggestions(anim::type::instant);
+		updateSearchTabs();
 		updateJumpToDateVisibility();
 		updateStoriesVisibility();
 	}
@@ -3190,6 +3336,9 @@ void Widget::updateControlsGeometry() {
 	if (_forumRequestsBar) {
 		_forumRequestsBar->resizeToWidth(barw);
 	}
+	if (_searchTabs) {
+		_searchTabs->resizeToWidth(barw);
+	}
 	_updateScrollGeometryCached = [=] {
 		const auto moreChatsBarTop = expandedStoriesTop
 			+ ((!_stories || _stories->isHidden()) ? 0 : _aboveScrollAdded);
@@ -3211,8 +3360,13 @@ void Widget::updateControlsGeometry() {
 		if (_forumReportBar) {
 			_forumReportBar->bar().move(0, forumReportTop);
 		}
-		const auto scrollTop = forumReportTop
+		const auto searchTabsTop = forumReportTop
 			+ (_forumReportBar ? _forumReportBar->bar().height() : 0);
+		if (_searchTabs) {
+			_searchTabs->move(0, searchTabsTop);
+		}
+		const auto scrollTop = searchTabsTop
+			+ (_searchTabs ? _searchTabs->height() : 0);
 		const auto scrollHeight = height() - scrollTop - bottomSkip;
 		const auto wasScrollHeight = _scroll->height();
 		_scroll->setGeometry(0, scrollTop, scrollWidth, scrollHeight);

Telegram/SourceFiles/dialogs/dialogs_widget.h

@@ -76,6 +76,8 @@ struct ChosenRow;
 class InnerWidget;
 enum class SearchRequestType;
 class Suggestions;
+class ChatSearchTabs;
+enum class ChatSearchTab : uchar;
 
 class Widget final : public Window::AbstractSectionWidget {
 public:
@@ -225,6 +227,7 @@ private:
 		QPixmap newContentCache,
 		Window::SlideDirection direction);
 
+	void applySearchTab();
 	void openChildList(
 		not_null<Data::Forum*> forum,
 		const Window::SectionShow &params);
@@ -232,6 +235,7 @@ private:
 
 	void fullSearchRefreshOn(rpl::producer<> events);
 	void updateCancelSearch();
+	bool fixSearchQuery();
 	void applySearchUpdate(bool force = false);
 	void refreshLoadMoreButton(bool mayBlock, bool isBlocked);
 	void loadMoreBlockedByDate();
@@ -251,6 +255,7 @@ private:
 	void updateScrollUpPosition();
 	void updateLockUnlockPosition();
 	void updateSuggestions(anim::type animated);
+	void updateSearchTabs();
 	void processSearchFocusChange();
 
 	[[nodiscard]] bool redirectToSearchPossible() const;
@@ -289,6 +294,7 @@ private:
 	QPointer<InnerWidget> _inner;
 	std::unique_ptr<Suggestions> _suggestions;
 	std::vector<std::unique_ptr<Suggestions>> _hidingSuggestions;
+	std::unique_ptr<ChatSearchTabs> _searchTabs;
 	class BottomButton;
 	object_ptr<BottomButton> _updateTelegram = { nullptr };
 	object_ptr<BottomButton> _loadMoreChats = { nullptr };
@@ -304,6 +310,9 @@ private:
 	object_ptr<Ui::JumpDownButton> _scrollToTop;
 	bool _scrollToTopIsShown = false;
 	bool _forumSearchRequested = false;
+	bool _fixingSearchQuery = false;
+	bool _searchingHashtag = false;
+	ChatSearchTab _searchTab = ChatSearchTab();
 
 	Data::Folder *_openedFolder = nullptr;
 	Data::Forum *_openedForum = nullptr;
@@ -316,6 +325,10 @@ private:
 	bool _searchSuggestionsLocked = false;
 	bool _searchHasFocus = false;
 
+	Key _hiddenSearchInChat;
+	PeerData *_hiddenSearchFromAuthor = nullptr;
+	std::vector<Data::ReactionId> _hiddenSearchTags;
+
 	rpl::event_stream<rpl::producer<Stories::Content>> _storiesContents;
 	base::flat_map<PeerId, Ui::PeerUserpicView> _storiesUserpicsViewsHidden;
 	base::flat_map<PeerId, Ui::PeerUserpicView> _storiesUserpicsViewsShown;

Telegram/SourceFiles/dialogs/ui/chat_search_tabs.cpp

@@ -0,0 +1,178 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "dialogs/ui/chat_search_tabs.h"
+
+#include "lang/lang_keys.h"
+#include "ui/widgets/discrete_sliders.h"
+#include "ui/widgets/shadow.h"
+#include "styles/style_dialogs.h"
+
+namespace Dialogs {
+namespace {
+
+[[nodiscard]] QString TabLabel(
+		ChatSearchTab tab,
+		ChatSearchPeerTabType type = {}) {
+	switch (tab) {
+	case ChatSearchTab::MyMessages:
+		return tr::lng_search_tab_my_messages(tr::now);
+	case ChatSearchTab::ThisTopic:
+		return tr::lng_search_tab_this_topic(tr::now);
+	case ChatSearchTab::ThisPeer:
+		switch (type) {
+		case ChatSearchPeerTabType::Chat:
+			return tr::lng_search_tab_this_chat(tr::now);
+		case ChatSearchPeerTabType::Channel:
+			return tr::lng_search_tab_this_channel(tr::now);
+		case ChatSearchPeerTabType::Group:
+			return tr::lng_search_tab_this_group(tr::now);
+		}
+		Unexpected("Type in Dialogs::TabLabel.");
+	case ChatSearchTab::PublicPosts:
+		return tr::lng_search_tab_public_posts(tr::now);
+	}
+	Unexpected("Tab in Dialogs::TabLabel.");
+}
+
+} // namespace
+
+TextWithEntities DefaultShortLabel(ChatSearchTab tab) {
+	// Return them in QString::fromUtf8 format.
+	switch (tab) {
+	case ChatSearchTab::MyMessages:
+		return { QString::fromUtf8("\xf0\x9f\x93\xa8") };
+	case ChatSearchTab::PublicPosts:
+		return { QString::fromUtf8("\xf0\x9f\x8c\x8e") };
+	}
+	Unexpected("Tab in Dialogs::DefaultShortLabel.");
+}
+
+FixedHashtagSearchQuery FixHashtagSearchQuery(
+		const QString &query,
+		int cursorPosition) {
+	const auto trimmed = query.trimmed();
+	const auto hash = trimmed.isEmpty()
+		? query.size()
+		: query.indexOf(trimmed);
+	const auto start = std::min(cursorPosition, hash);
+	auto result = query.mid(0, start);
+	for (const auto &ch : query.mid(start)) {
+		if (ch.isSpace()) {
+			if (cursorPosition > result.size()) {
+				--cursorPosition;
+			}
+			continue;
+		} else if (result.size() == start) {
+			result += '#';
+			if (ch != '#') {
+				++cursorPosition;
+			}
+		}
+		if (ch != '#') {
+			result += ch;
+		}
+	}
+	return { result, cursorPosition };
+}
+
+bool IsHashtagSearchQuery(const QString &query) {
+	const auto trimmed = query.trimmed();
+	if (trimmed.isEmpty() || trimmed[0] != '#') {
+		return false;
+	}
+	for (const auto &ch : trimmed) {
+		if (ch.isSpace()) {
+			return false;
+		}
+	}
+	return true;
+}
+
+ChatSearchTabs::ChatSearchTabs(QWidget *parent, ChatSearchTab active)
+: RpWidget(parent)
+, _tabs(std::make_unique<Ui::SettingsSlider>(this, st::dialogsSearchTabs))
+, _shadow(std::make_unique<Ui::PlainShadow>(this))
+, _active(active) {
+	for (const auto tab : {
+		ChatSearchTab::ThisTopic,
+		ChatSearchTab::ThisPeer,
+		ChatSearchTab::MyMessages,
+		ChatSearchTab::PublicPosts,
+	}) {
+		_list.push_back({ tab, TabLabel(tab) });
+	}
+	_tabs->move(0, 0);
+	_tabs->sectionActivated(
+	) | rpl::start_with_next([=](int index) {
+		for (const auto &tab : _list) {
+			if (!index) {
+				_active = tab.value;
+				return;
+			}
+			if (!tab.shortLabel.empty()) {
+				--index;
+			}
+		}
+	}, lifetime());
+}
+
+ChatSearchTabs::~ChatSearchTabs() = default;
+
+void ChatSearchTabs::setPeerTabType(ChatSearchPeerTabType type) {
+	_type = type;
+	const auto i = ranges::find(_list, ChatSearchTab::ThisPeer, &Tab::value);
+	Assert(i != end(_list));
+	i->label = TabLabel(ChatSearchTab::ThisPeer, type);
+	if (!i->shortLabel.empty()) {
+		refreshTabs(_active.current());
+	}
+}
+
+void ChatSearchTabs::setTabShortLabels(
+		std::vector<ShortLabel> labels,
+		ChatSearchTab active) {
+	for (const auto &label : labels) {
+		const auto i = ranges::find(_list, label.tab, &Tab::value);
+		Assert(i != end(_list));
+		i->shortLabel = std::move(label.label);
+	}
+	refreshTabs(active);
+}
+
+rpl::producer<ChatSearchTab> ChatSearchTabs::tabChanges() const {
+	return _active.changes();
+}
+
+void ChatSearchTabs::refreshTabs(ChatSearchTab active) {
+	auto index = 0;
+	auto labels = std::vector<QString>();
+	for (const auto &tab : _list) {
+		if (tab.value == active) {
+			index = int(labels.size());
+			Assert(!tab.shortLabel.empty());
+			labels.push_back(tab.label);
+		} else if (!tab.shortLabel.empty()) {
+			labels.push_back(tab.label);
+		}
+	}
+	_tabs->setSections(labels);
+	_tabs->setActiveSectionFast(index);
+	resizeToWidth(width());
+}
+
+int ChatSearchTabs::resizeGetHeight(int newWidth) {
+	_tabs->resizeToWidth(newWidth);
+	_shadow->setGeometry(
+		_tabs->x(),
+		_tabs->y() + _tabs->height() - st::lineWidth,
+		_tabs->width(),
+		st::lineWidth);
+	return _tabs->height();
+}
+
+} // namespace Dialogs

Telegram/SourceFiles/dialogs/ui/chat_search_tabs.h

@@ -0,0 +1,83 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "ui/rp_widget.h"
+
+namespace Ui {
+class SettingsSlider;
+class PlainShadow;
+} // namespace Ui
+
+namespace Dialogs {
+
+enum class ChatSearchTab : uchar {
+	MyMessages,
+	ThisTopic,
+	ThisPeer,
+	PublicPosts,
+};
+
+enum class ChatSearchPeerTabType : uchar {
+	Chat,
+	Channel,
+	Group,
+};
+
+// Available for MyMessages and PublicPosts.
+[[nodiscard]] TextWithEntities DefaultShortLabel(ChatSearchTab tab);
+
+class ChatSearchTabs final : public Ui::RpWidget {
+public:
+	ChatSearchTabs(QWidget *parent, ChatSearchTab active);
+	~ChatSearchTabs();
+
+	void setPeerTabType(ChatSearchPeerTabType type);
+
+	// A [custom] emoji to use when there is not enough space for text.
+	// Only tabs with available short labels are shown.
+	struct ShortLabel {
+		ChatSearchTab tab = {};
+		TextWithEntities label;
+	};
+	void setTabShortLabels(
+		std::vector<ShortLabel> labels,
+		ChatSearchTab active);
+
+	[[nodiscard]] rpl::producer<ChatSearchTab> tabChanges() const;
+
+private:
+	struct Tab {
+		ChatSearchTab value = {};
+		QString label;
+		TextWithEntities shortLabel;
+	};
+
+	void refreshTabs(ChatSearchTab active);
+	int resizeGetHeight(int newWidth) override;
+
+	const std::unique_ptr<Ui::SettingsSlider> _tabs;
+	const std::unique_ptr<Ui::PlainShadow> _shadow;
+
+	std::vector<Tab> _list;
+	rpl::variable<ChatSearchTab> _active;
+	ChatSearchPeerTabType _type = {};
+
+};
+
+struct FixedHashtagSearchQuery {
+	QString text;
+	int cursorPosition = 0;
+};
+[[nodiscard]] FixedHashtagSearchQuery FixHashtagSearchQuery(
+	const QString &query,
+	int cursorPosition);
+
+[[nodiscard]] bool IsHashtagSearchQuery(const QString &query);
+
+} // namespace Dialogs

Telegram/SourceFiles/info/profile/info_profile_cover.cpp

@@ -211,7 +211,7 @@ void TopicIconView::setupImage(not_null<Data::ForumTopic*> topic) {
 		) | rpl::start_with_next([=] {
 			_image = ForumTopicGeneralIconFrame(
 				st::infoForumTopicIcon.size,
-				_generalIconFg);
+				_generalIconFg->c);
 			_update();
 		}, _lifetime);
 		return;

Telegram/cmake/td_ui.cmake

@@ -85,6 +85,8 @@ PRIVATE
     data/data_subscription_option.h
 
     dialogs/dialogs_three_state_icon.h
+    dialogs/ui/chat_search_tabs.cpp
+    dialogs/ui/chat_search_tabs.h
     dialogs/ui/dialogs_stories_list.cpp
     dialogs/ui/dialogs_stories_list.h
     dialogs/ui/top_peers_strip.cpp