diff --git a/Telegram/SourceFiles/api/api_chat_participants.cpp b/Telegram/SourceFiles/api/api_chat_participants.cpp
index 197474083..b429dc465 100644
--- a/Telegram/SourceFiles/api/api_chat_participants.cpp
+++ b/Telegram/SourceFiles/api/api_chat_participants.cpp
@@ -598,7 +598,7 @@ void ChatParticipants::requestSelf(not_null<ChannelData*> channel) {
 		});
 	}).fail([=](const MTP::Error &error) {
 		_selfParticipantRequests.erase(channel);
-		if (error.type() == qstr("CHANNEL_PRIVATE")) {
+		if (error.type() == u"CHANNEL_PRIVATE"_q) {
 			channel->privateErrorReceived();
 		}
 		finalize();
diff --git a/Telegram/SourceFiles/api/api_media.cpp b/Telegram/SourceFiles/api/api_media.cpp
index e1aeef3be..b778aa59b 100644
--- a/Telegram/SourceFiles/api/api_media.cpp
+++ b/Telegram/SourceFiles/api/api_media.cpp
@@ -23,7 +23,7 @@ MTPVector<MTPDocumentAttribute> ComposeSendingDocumentAttributes(
 	auto attributes = QVector<MTPDocumentAttribute>(1, filenameAttribute);
 	if (dimensions.width() > 0 && dimensions.height() > 0) {
 		const auto duration = document->getDuration();
-		if (duration >= 0 && !document->hasMimeType(qstr("image/gif"))) {
+		if (duration >= 0 && !document->hasMimeType(u"image/gif"_q)) {
 			auto flags = MTPDdocumentAttributeVideo::Flags(0);
 			using VideoFlag = MTPDdocumentAttributeVideo::Flag;
 			if (document->isVideoMessage()) {
diff --git a/Telegram/SourceFiles/api/api_sending.cpp b/Telegram/SourceFiles/api/api_sending.cpp
index 64d28c770..93f9e8fb4 100644
--- a/Telegram/SourceFiles/api/api_sending.cpp
+++ b/Telegram/SourceFiles/api/api_sending.cpp
@@ -166,7 +166,7 @@ void SendExistingMedia(
 			), [=](const MTPUpdates &result, const MTP::Response &response) {
 		}, [=](const MTP::Error &error, const MTP::Response &response) {
 			if (error.code() == 400
-				&& error.type().startsWith(qstr("FILE_REFERENCE_"))) {
+				&& error.type().startsWith(u"FILE_REFERENCE_"_q)) {
 				api->refreshFileReference(origin, [=](const auto &result) {
 					if (media->fileReference() != usedFileReference) {
 						repeatRequest(repeatRequest);
diff --git a/Telegram/SourceFiles/api/api_single_message_search.cpp b/Telegram/SourceFiles/api/api_single_message_search.cpp
index 6f810eb86..0875091bc 100644
--- a/Telegram/SourceFiles/api/api_single_message_search.cpp
+++ b/Telegram/SourceFiles/api/api_single_message_search.cpp
@@ -33,12 +33,12 @@ Key ExtractKey(const QString &query) {
 				qthelp::UrlParamNameTransform::ToLower)
 			: QMap<QString, QString>();
 	};
-	if (check.startsWith(qstr("tg://privatepost"), Qt::CaseInsensitive)) {
+	if (check.startsWith(u"tg://privatepost"_q, Qt::CaseInsensitive)) {
 		const auto params = parse();
 		const auto channel = params.value("channel");
 		const auto post = params.value("post").toInt();
 		return (channel.toULongLong() && post) ? Key{ channel, post } : Key();
-	} else if (check.startsWith(qstr("tg://resolve"), Qt::CaseInsensitive)) {
+	} else if (check.startsWith(u"tg://resolve"_q, Qt::CaseInsensitive)) {
 		const auto params = parse();
 		const auto domain = params.value("domain");
 		const auto post = params.value("post").toInt();
@@ -220,7 +220,7 @@ QString ConvertPeerSearchQuery(const QString &query) {
 	const auto trimmed = query.trimmed();
 	const auto local = Core::TryConvertUrlToLocal(trimmed);
 	const auto check = local.isEmpty() ? trimmed : local;
-	if (!check.startsWith(qstr("tg://resolve"), Qt::CaseInsensitive)) {
+	if (!check.startsWith(u"tg://resolve"_q, Qt::CaseInsensitive)) {
 		return query;
 	}
 	const auto delimeter = check.indexOf('?');
diff --git a/Telegram/SourceFiles/api/api_updates.cpp b/Telegram/SourceFiles/api/api_updates.cpp
index 54ef340e4..9518430b3 100644
--- a/Telegram/SourceFiles/api/api_updates.cpp
+++ b/Telegram/SourceFiles/api/api_updates.cpp
@@ -95,7 +95,7 @@ void ProcessScheduledMessageWithElapsedTime(
 }
 
 bool IsForceLogoutNotification(const MTPDupdateServiceNotification &data) {
-	return qs(data.vtype()).startsWith(qstr("AUTH_KEY_DROP_"));
+	return qs(data.vtype()).startsWith(u"AUTH_KEY_DROP_"_q);
 }
 
 bool HasForceLogoutNotification(const MTPUpdates &updates) {
diff --git a/Telegram/SourceFiles/apiwrap.cpp b/Telegram/SourceFiles/apiwrap.cpp
index c810f69db..d3b2bec0d 100644
--- a/Telegram/SourceFiles/apiwrap.cpp
+++ b/Telegram/SourceFiles/apiwrap.cpp
@@ -479,12 +479,12 @@ void ApiWrap::sendMessageFail(
 		FullMsgId itemId) {
 	const auto show = ShowForPeer(peer);
 
-	if (error == qstr("PEER_FLOOD")) {
+	if (error == u"PEER_FLOOD"_q) {
 		show->showBox(
 			Ui::MakeInformBox(
 				PeerFloodErrorText(&session(), PeerFloodType::Send)),
 			Ui::LayerOption::CloseOther);
-	} else if (error == qstr("USER_BANNED_IN_CHANNEL")) {
+	} else if (error == u"USER_BANNED_IN_CHANNEL"_q) {
 		const auto link = Ui::Text::Link(
 			tr::lng_cant_more_info(tr::now),
 			session().createInternalLinkFull(qsl("spambot")));
@@ -496,8 +496,8 @@ void ApiWrap::sendMessageFail(
 					link,
 					Ui::Text::WithEntities)),
 			Ui::LayerOption::CloseOther);
-	} else if (error.startsWith(qstr("SLOWMODE_WAIT_"))) {
-		const auto chop = qstr("SLOWMODE_WAIT_").size();
+	} else if (error.startsWith(u"SLOWMODE_WAIT_"_q)) {
+		const auto chop = u"SLOWMODE_WAIT_"_q.size();
 		const auto left = base::StringViewMid(error, chop).toInt();
 		if (const auto channel = peer->asChannel()) {
 			const auto seconds = channel->slowmodeSeconds();
@@ -508,7 +508,7 @@ void ApiWrap::sendMessageFail(
 				requestFullPeer(peer);
 			}
 		}
-	} else if (error == qstr("SCHEDULE_STATUS_PRIVATE")) {
+	} else if (error == u"SCHEDULE_STATUS_PRIVATE"_q) {
 		auto &scheduled = _session->data().scheduledMessages();
 		Assert(peer->isUser());
 		if (const auto item = scheduled.lookupItem(peer->id, itemId.msg)) {
@@ -517,7 +517,7 @@ void ApiWrap::sendMessageFail(
 				Ui::MakeInformBox(tr::lng_cant_do_this()),
 				Ui::LayerOption::CloseOther);
 		}
-	} else if (error == qstr("CHAT_FORWARDS_RESTRICTED")) {
+	} else if (error == u"CHAT_FORWARDS_RESTRICTED"_q) {
 		if (show->valid()) {
 			Ui::ShowMultilineToast({
 				.parentOverride = show->toastParent(),
@@ -528,7 +528,7 @@ void ApiWrap::sendMessageFail(
 				.duration = kJoinErrorDuration
 			});
 		}
-	} else if (error == qstr("PREMIUM_ACCOUNT_REQUIRED")) {
+	} else if (error == u"PREMIUM_ACCOUNT_REQUIRED"_q) {
 		Settings::ShowPremium(&session(), "premium_stickers");
 	}
 	if (const auto item = _session->data().message(itemId)) {
@@ -3616,7 +3616,7 @@ void ApiWrap::sendMessage(MessageToSend &&message) {
 					UnixtimeFromMsgId(response.outerMsgId));
 			}
 		}, [=](const MTP::Error &error, const MTP::Response &response) {
-			if (error.type() == qstr("MESSAGE_EMPTY")) {
+			if (error.type() == u"MESSAGE_EMPTY"_q) {
 				lastMessage->destroy();
 			} else {
 				sendMessageFail(error, peer, randomId, newId);
diff --git a/Telegram/SourceFiles/boxes/about_box.cpp b/Telegram/SourceFiles/boxes/about_box.cpp
index 51b85471e..916f47867 100644
--- a/Telegram/SourceFiles/boxes/about_box.cpp
+++ b/Telegram/SourceFiles/boxes/about_box.cpp
@@ -64,7 +64,7 @@ AboutBox::AboutBox(QWidget *parent)
 }
 
 void AboutBox::prepare() {
-	setTitle(rpl::single(qsl("Telegram Desktop")));
+	setTitle(rpl::single(u"Telegram Desktop"_q));
 
 	addButton(tr::lng_close(), [this] { closeBox(); });
 
@@ -94,19 +94,19 @@ void AboutBox::resizeEvent(QResizeEvent *e) {
 
 void AboutBox::showVersionHistory() {
 	if (cRealAlphaVersion()) {
-		auto url = qsl("https://tdesktop.com/");
+		auto url = u"https://tdesktop.com/"_q;
 		if (Platform::IsWindows32Bit()) {
-			url += qsl("win/%1.zip");
+			url += u"win/%1.zip"_q;
 		} else if (Platform::IsWindows64Bit()) {
-			url += qsl("win64/%1.zip");
+			url += u"win64/%1.zip"_q;
 		} else if (Platform::IsMac()) {
-			url += qsl("mac/%1.zip");
+			url += u"mac/%1.zip"_q;
 		} else if (Platform::IsLinux()) {
-			url += qsl("linux/%1.tar.xz");
+			url += u"linux/%1.tar.xz"_q;
 		} else {
 			Unexpected("Platform value.");
 		}
-		url = url.arg(qsl("talpha%1_%2").arg(cRealAlphaVersion()).arg(Core::countAlphaVersionSignature(cRealAlphaVersion())));
+		url = url.arg(u"talpha%1_%2"_q.arg(cRealAlphaVersion()).arg(Core::countAlphaVersionSignature(cRealAlphaVersion())));
 
 		QGuiApplication::clipboard()->setText(url);
 
@@ -129,7 +129,7 @@ void AboutBox::keyPressEvent(QKeyEvent *e) {
 }
 
 QString telegramFaqLink() {
-	const auto result = qsl("https://telegram.org/faq");
+	const auto result = u"https://telegram.org/faq"_q;
 	const auto langpacked = [&](const char *language) {
 		return result + '/' + language;
 	};
@@ -139,7 +139,7 @@ QString telegramFaqLink() {
 			return langpacked(language);
 		}
 	}
-	if (current.startsWith(qstr("pt-br"))) {
+	if (current.startsWith(u"pt-br"_q)) {
 		return langpacked("br");
 	}
 	return result;
@@ -148,7 +148,7 @@ QString telegramFaqLink() {
 QString currentVersionText() {
 	auto result = QString::fromLatin1(AppVersionStr);
 	if (cAlphaVersion()) {
-		result += qsl(" alpha %1").arg(cAlphaVersion() % 1000);
+		result += u" alpha %1"_q.arg(cAlphaVersion() % 1000);
 	} else if (AppBetaVersion) {
 		result += " beta";
 	}
diff --git a/Telegram/SourceFiles/boxes/change_phone_box.cpp b/Telegram/SourceFiles/boxes/change_phone_box.cpp
index ed83a6408..81179c6b5 100644
--- a/Telegram/SourceFiles/boxes/change_phone_box.cpp
+++ b/Telegram/SourceFiles/boxes/change_phone_box.cpp
@@ -270,11 +270,11 @@ void ChangePhone::EnterPhone::sendPhoneFail(
 		const QString &phoneNumber) {
 	if (MTP::IsFloodError(error)) {
 		showError(tr::lng_flood_error(tr::now));
-	} else if (error.type() == qstr("PHONE_NUMBER_INVALID")) {
+	} else if (error.type() == u"PHONE_NUMBER_INVALID"_q) {
 		showError(tr::lng_bad_phone(tr::now));
-	} else if (error.type() == qstr("PHONE_NUMBER_BANNED")) {
+	} else if (error.type() == u"PHONE_NUMBER_BANNED"_q) {
 		Ui::ShowPhoneBannedError(&_controller->window(), phoneNumber);
-	} else if (error.type() == qstr("PHONE_NUMBER_OCCUPIED")) {
+	} else if (error.type() == u"PHONE_NUMBER_OCCUPIED"_q) {
 		_controller->show(
 			Ui::MakeInformBox(
 				tr::lng_change_phone_occupied(
@@ -428,13 +428,13 @@ void ChangePhone::EnterCode::showError(const QString &text) {
 void ChangePhone::EnterCode::sendCodeFail(const MTP::Error &error) {
 	if (MTP::IsFloodError(error)) {
 		showError(tr::lng_flood_error(tr::now));
-	} else if (error.type() == qstr("PHONE_CODE_EMPTY")
-		|| error.type() == qstr("PHONE_CODE_INVALID")) {
+	} else if (error.type() == u"PHONE_CODE_EMPTY"_q
+		|| error.type() == u"PHONE_CODE_INVALID"_q) {
 		showError(tr::lng_bad_code(tr::now));
-	} else if (error.type() == qstr("PHONE_CODE_EXPIRED")
-		|| error.type() == qstr("PHONE_NUMBER_BANNED")) {
+	} else if (error.type() == u"PHONE_CODE_EXPIRED"_q
+		|| error.type() == u"PHONE_NUMBER_BANNED"_q) {
 		closeBox(); // Go back to phone input.
-	} else if (error.type() == qstr("PHONE_NUMBER_INVALID")) {
+	} else if (error.type() == u"PHONE_NUMBER_INVALID"_q) {
 		showError(tr::lng_bad_phone(tr::now));
 	} else {
 		showError(Lang::Hard::ServerError());
diff --git a/Telegram/SourceFiles/boxes/delete_messages_box.cpp b/Telegram/SourceFiles/boxes/delete_messages_box.cpp
index 33f1a0e4e..cfddd2adc 100644
--- a/Telegram/SourceFiles/boxes/delete_messages_box.cpp
+++ b/Telegram/SourceFiles/boxes/delete_messages_box.cpp
@@ -79,7 +79,7 @@ DeleteMessagesBox::DeleteMessagesBox(
 void DeleteMessagesBox::prepare() {
 	auto details = TextWithEntities();
 	const auto appendDetails = [&](TextWithEntities &&text) {
-		details.append(qstr("\n\n")).append(std::move(text));
+		details.append(u"\n\n"_q).append(std::move(text));
 	};
 	auto deleteText = lifetime().make_state<rpl::variable<QString>>();
 	*deleteText = tr::lng_box_delete();
diff --git a/Telegram/SourceFiles/boxes/download_path_box.cpp b/Telegram/SourceFiles/boxes/download_path_box.cpp
index a484225e0..16d4d843a 100644
--- a/Telegram/SourceFiles/boxes/download_path_box.cpp
+++ b/Telegram/SourceFiles/boxes/download_path_box.cpp
@@ -91,7 +91,7 @@ void DownloadPathBox::radioChanged(Directory value) {
 void DownloadPathBox::editPath() {
 	const auto initialPath = [] {
 		const auto path = Core::App().settings().downloadPath();
-		if (!path.isEmpty() && path != qstr("tmp")) {
+		if (!path.isEmpty() && path != u"tmp"_q) {
 			return path.left(path.size() - (path.endsWith('/') ? 1 : 0));
 		}
 		return QString();
diff --git a/Telegram/SourceFiles/boxes/passcode_box.cpp b/Telegram/SourceFiles/boxes/passcode_box.cpp
index dc71155f3..5ec269aac 100644
--- a/Telegram/SourceFiles/boxes/passcode_box.cpp
+++ b/Telegram/SourceFiles/boxes/passcode_box.cpp
@@ -495,19 +495,19 @@ void PasscodeBox::setPasswordFail(const QString &type) {
 
 	closeReplacedBy();
 	_setRequest = 0;
-	if (type == qstr("PASSWORD_HASH_INVALID")
-		|| type == qstr("SRP_PASSWORD_CHANGED")) {
+	if (type == u"PASSWORD_HASH_INVALID"_q
+		|| type == u"SRP_PASSWORD_CHANGED"_q) {
 		if (_oldPasscode->isHidden()) {
 			_passwordReloadNeeded.fire({});
 			closeBox();
 		} else {
 			badOldPasscode();
 		}
-	} else if (type == qstr("SRP_ID_INVALID")) {
+	} else if (type == u"SRP_ID_INVALID"_q) {
 		handleSrpIdInvalid();
-	//} else if (type == qstr("NEW_PASSWORD_BAD")) {
-	//} else if (type == qstr("NEW_SALT_INVALID")) {
-	} else if (type == qstr("EMAIL_INVALID")) {
+	//} else if (type == u"NEW_PASSWORD_BAD"_q) {
+	//} else if (type == u"NEW_SALT_INVALID"_q) {
+	} else if (type == u"EMAIL_INVALID"_q) {
 		_emailError = tr::lng_cloud_password_bad_email(tr::now);
 		_recoverEmail->setFocus();
 		_recoverEmail->showError();
@@ -519,7 +519,7 @@ void PasscodeBox::setPasswordFail(
 		const QByteArray &newPasswordBytes,
 		const QString &email,
 		const MTP::Error &error) {
-	const auto prefix = qstr("EMAIL_UNCONFIRMED_");
+	const auto prefix = u"EMAIL_UNCONFIRMED_"_q;
 	if (error.type().startsWith(prefix)) {
 		const auto codeLength = base::StringViewMid(error.type(), prefix.size()).toInt();
 
@@ -552,9 +552,9 @@ void PasscodeBox::validateEmail(
 			_setRequest = 0;
 			if (MTP::IsFloodError(error)) {
 				errors->fire(tr::lng_flood_error(tr::now));
-			} else if (error.type() == qstr("CODE_INVALID")) {
+			} else if (error.type() == u"CODE_INVALID"_q) {
 				errors->fire(tr::lng_signin_wrong_code(tr::now));
-			} else if (error.type() == qstr("EMAIL_HASH_EXPIRED")) {
+			} else if (error.type() == u"EMAIL_HASH_EXPIRED"_q) {
 				const auto weak = Ui::MakeWeak(this);
 				_clearUnconfirmedPassword.fire({});
 				if (weak) {
@@ -801,9 +801,9 @@ bool PasscodeBox::handleCustomCheckError(const MTP::Error &error) {
 
 bool PasscodeBox::handleCustomCheckError(const QString &type) {
 	if (MTP::IsFloodError(type)
-		|| type == qstr("PASSWORD_HASH_INVALID")
-		|| type == qstr("SRP_PASSWORD_CHANGED")
-		|| type == qstr("SRP_ID_INVALID")) {
+		|| type == u"PASSWORD_HASH_INVALID"_q
+		|| type == u"SRP_PASSWORD_CHANGED"_q
+		|| type == u"SRP_ID_INVALID"_q) {
 		setPasswordFail(type);
 		return true;
 	}
@@ -979,7 +979,7 @@ void PasscodeBox::resetSecret(
 		});
 	}).fail([=](const MTP::Error &error) {
 		_setRequest = 0;
-		if (error.type() == qstr("SRP_ID_INVALID")) {
+		if (error.type() == u"SRP_ID_INVALID"_q) {
 			handleSrpIdInvalid();
 		}
 	}).send();
@@ -1330,17 +1330,17 @@ void RecoverBox::checkSubmitFail(const MTP::Error &error) {
 	_submitRequest = 0;
 
 	const QString &err = error.type();
-	if (err == qstr("PASSWORD_EMPTY")) {
+	if (err == u"PASSWORD_EMPTY"_q) {
 		_newPasswordSet.fire(QByteArray());
 		getDelegate()->show(
 			Ui::MakeInformBox(tr::lng_cloud_password_removed()),
 			Ui::LayerOption::CloseOther);
-	} else if (err == qstr("PASSWORD_RECOVERY_NA")) {
+	} else if (err == u"PASSWORD_RECOVERY_NA"_q) {
 		closeBox();
-	} else if (err == qstr("PASSWORD_RECOVERY_EXPIRED")) {
+	} else if (err == u"PASSWORD_RECOVERY_EXPIRED"_q) {
 		_recoveryExpired.fire({});
 		closeBox();
-	} else if (err == qstr("CODE_INVALID")) {
+	} else if (err == u"CODE_INVALID"_q) {
 		setError(tr::lng_signin_wrong_code(tr::now));
 		_recoverCode->selectAll();
 		_recoverCode->setFocus();
@@ -1381,9 +1381,9 @@ RecoveryEmailValidation ConfirmRecoveryEmail(
 			*requestId = 0;
 			if (MTP::IsFloodError(error)) {
 				errors->fire(tr::lng_flood_error(tr::now));
-			} else if (error.type() == qstr("CODE_INVALID")) {
+			} else if (error.type() == u"CODE_INVALID"_q) {
 				errors->fire(tr::lng_signin_wrong_code(tr::now));
-			} else if (error.type() == qstr("EMAIL_HASH_EXPIRED")) {
+			} else if (error.type() == u"EMAIL_HASH_EXPIRED"_q) {
 				cancels->fire({});
 				if (*weak) {
 					auto box = Ui::MakeInformBox(
diff --git a/Telegram/SourceFiles/boxes/peers/edit_participant_box.cpp b/Telegram/SourceFiles/boxes/peers/edit_participant_box.cpp
index 5d3e3b69b..79db150c8 100644
--- a/Telegram/SourceFiles/boxes/peers/edit_participant_box.cpp
+++ b/Telegram/SourceFiles/boxes/peers/edit_participant_box.cpp
@@ -647,15 +647,15 @@ void EditAdminBox::sendTransferRequestFrom(
 
 		const auto &type = error.type();
 		const auto problem = [&] {
-			if (type == qstr("CHANNELS_ADMIN_PUBLIC_TOO_MUCH")) {
+			if (type == u"CHANNELS_ADMIN_PUBLIC_TOO_MUCH"_q) {
 				return tr::lng_channels_too_much_public_other(tr::now);
-			} else if (type == qstr("CHANNELS_ADMIN_LOCATED_TOO_MUCH")) {
+			} else if (type == u"CHANNELS_ADMIN_LOCATED_TOO_MUCH"_q) {
 				return tr::lng_channels_too_much_located_other(tr::now);
-			} else if (type == qstr("ADMINS_TOO_MUCH")) {
+			} else if (type == u"ADMINS_TOO_MUCH"_q) {
 				return (channel->isBroadcast()
 					? tr::lng_error_admin_limit_channel
 					: tr::lng_error_admin_limit)(tr::now);
-			} else if (type == qstr("CHANNEL_INVALID")) {
+			} else if (type == u"CHANNEL_INVALID"_q) {
 				return (channel->isBroadcast()
 					? tr::lng_channel_not_accessible
 					: tr::lng_group_not_accessible)(tr::now);
@@ -663,9 +663,9 @@ void EditAdminBox::sendTransferRequestFrom(
 			return Lang::Hard::ServerError();
 		}();
 		const auto recoverable = [&] {
-			return (type == qstr("PASSWORD_MISSING"))
-				|| (type == qstr("PASSWORD_TOO_FRESH_XXX"))
-				|| (type == qstr("SESSION_TOO_FRESH_XXX"));
+			return (type == u"PASSWORD_MISSING"_q)
+				|| (type == u"PASSWORD_TOO_FRESH_XXX"_q)
+				|| (type == u"SESSION_TOO_FRESH_XXX"_q);
 		}();
 		const auto weak = Ui::MakeWeak(this);
 		getDelegate()->show(Ui::MakeInformBox(problem));
diff --git a/Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp b/Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp
index 45f2d33f2..44a12939b 100644
--- a/Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp
+++ b/Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp
@@ -112,7 +112,7 @@ void SaveChatAdmin(
 		const auto &type = error.type();
 		if (retryOnNotParticipant
 			&& isAdmin
-			&& (type == qstr("USER_NOT_PARTICIPANT"))) {
+			&& (type == u"USER_NOT_PARTICIPANT"_q)) {
 			AddChatParticipant(chat, user, [=] {
 				SaveChatAdmin(chat, user, isAdmin, onDone, onFail, false);
 			}, onFail);
diff --git a/Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp b/Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp
index add63faa7..bc541f9ed 100644
--- a/Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp
+++ b/Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp
@@ -154,7 +154,7 @@ void SaveDefaultRestrictions(
 		done();
 	}).fail([=](const MTP::Error &error) {
 		api->clearModifyRequest(key);
-		if (error.type() != qstr("CHAT_NOT_MODIFIED")) {
+		if (error.type() != u"CHAT_NOT_MODIFIED"_q) {
 			return;
 		}
 		if (const auto chat = peer->asChat()) {
@@ -187,7 +187,7 @@ void SaveSlowmodeSeconds(
 		done();
 	}).fail([=](const MTP::Error &error) {
 		api->clearModifyRequest(key);
-		if (error.type() != qstr("CHAT_NOT_MODIFIED")) {
+		if (error.type() != u"CHAT_NOT_MODIFIED"_q) {
 			return;
 		}
 		channel->setSlowmodeSeconds(seconds);
@@ -1568,7 +1568,7 @@ void Controller::saveUsername() {
 		continueSave();
 	}).fail([=](const MTP::Error &error) {
 		const auto &type = error.type();
-		if (type == qstr("USERNAME_NOT_MODIFIED")) {
+		if (type == u"USERNAME_NOT_MODIFIED"_q) {
 			channel->setName(
 				TextUtilities::SingleLine(channel->name()),
 				TextUtilities::SingleLine(*_savingData.username));
@@ -1578,10 +1578,10 @@ void Controller::saveUsername() {
 
 		// Very rare case.
 		showEditPeerTypeBox([&] {
-			if (type == qstr("USERNAME_INVALID")) {
+			if (type == u"USERNAME_INVALID"_q) {
 				return tr::lng_create_channel_link_invalid();
-			} else if (type == qstr("USERNAME_OCCUPIED")
-				|| type == qstr("USERNAMES_UNAVAILABLE")) {
+			} else if (type == u"USERNAME_OCCUPIED"_q
+				|| type == u"USERNAMES_UNAVAILABLE"_q) {
 				return tr::lng_create_channel_link_occupied();
 			}
 			return tr::lng_create_channel_link_invalid();
@@ -1635,8 +1635,8 @@ void Controller::saveTitle() {
 	};
 	const auto onFail = [=](const MTP::Error &error) {
 		const auto &type = error.type();
-		if (type == qstr("CHAT_NOT_MODIFIED")
-			|| type == qstr("CHAT_TITLE_NOT_MODIFIED")) {
+		if (type == u"CHAT_NOT_MODIFIED"_q
+			|| type == u"CHAT_TITLE_NOT_MODIFIED"_q) {
 			if (const auto channel = _peer->asChannel()) {
 				channel->setName(
 					*_savingData.title,
@@ -1648,7 +1648,7 @@ void Controller::saveTitle() {
 			return;
 		}
 		_controls.title->showError();
-		if (type == qstr("NO_CHAT_TITLE")) {
+		if (type == u"NO_CHAT_TITLE"_q) {
 			_box->scrollToWidget(_controls.title);
 		}
 		cancelSave();
@@ -1689,7 +1689,7 @@ void Controller::saveDescription() {
 		successCallback();
 	}).fail([=](const MTP::Error &error) {
 		const auto &type = error.type();
-		if (type == qstr("CHAT_ABOUT_NOT_MODIFIED")) {
+		if (type == u"CHAT_ABOUT_NOT_MODIFIED"_q) {
 			successCallback();
 			return;
 		}
@@ -1746,7 +1746,7 @@ void Controller::togglePreHistoryHidden(
 		channel->session().api().applyUpdates(result);
 		apply();
 	}).fail([=](const MTP::Error &error) {
-		if (error.type() == qstr("CHAT_NOT_MODIFIED")) {
+		if (error.type() == u"CHAT_NOT_MODIFIED"_q) {
 			apply();
 		} else {
 			fail();
@@ -1779,7 +1779,7 @@ void Controller::saveForum() {
 		channel->session().api().applyUpdates(result);
 		continueSave();
 	}).fail([=](const MTP::Error &error) {
-		if (error.type() == qstr("CHAT_NOT_MODIFIED")) {
+		if (error.type() == u"CHAT_NOT_MODIFIED"_q) {
 			continueSave();
 		} else {
 			cancelSave();
@@ -1801,7 +1801,7 @@ void Controller::saveSignatures() {
 		channel->session().api().applyUpdates(result);
 		continueSave();
 	}).fail([=](const MTP::Error &error) {
-		if (error.type() == qstr("CHAT_NOT_MODIFIED")) {
+		if (error.type() == u"CHAT_NOT_MODIFIED"_q) {
 			continueSave();
 		} else {
 			cancelSave();
@@ -1821,7 +1821,7 @@ void Controller::saveForwards() {
 		_peer->session().api().applyUpdates(result);
 		continueSave();
 	}).fail([=](const MTP::Error &error) {
-		if (error.type() == qstr("CHAT_NOT_MODIFIED")) {
+		if (error.type() == u"CHAT_NOT_MODIFIED"_q) {
 			continueSave();
 		} else {
 			cancelSave();
@@ -1843,7 +1843,7 @@ void Controller::saveJoinToWrite() {
 		_peer->session().api().applyUpdates(result);
 		continueSave();
 	}).fail([=](const MTP::Error &error) {
-		if (error.type() == qstr("CHAT_NOT_MODIFIED")) {
+		if (error.type() == u"CHAT_NOT_MODIFIED"_q) {
 			continueSave();
 		} else {
 			cancelSave();
@@ -1865,7 +1865,7 @@ void Controller::saveRequestToJoin() {
 		_peer->session().api().applyUpdates(result);
 		continueSave();
 	}).fail([=](const MTP::Error &error) {
-		if (error.type() == qstr("CHAT_NOT_MODIFIED")) {
+		if (error.type() == u"CHAT_NOT_MODIFIED"_q) {
 			continueSave();
 		} else {
 			cancelSave();
@@ -1921,7 +1921,7 @@ void Controller::deleteChannel() {
 	)).done([=](const MTPUpdates &result) {
 		session->api().applyUpdates(result);
 	//}).fail([=](const MTP::Error &error) {
-	//	if (error.type() == qstr("CHANNEL_TOO_LARGE")) {
+	//	if (error.type() == u"CHANNEL_TOO_LARGE"_q) {
 	//		Ui::show(Box<Ui::InformBox>(tr::lng_cant_delete_channel(tr::now)));
 	//	}
 	}).send();
diff --git a/Telegram/SourceFiles/boxes/peers/edit_peer_invite_link.cpp b/Telegram/SourceFiles/boxes/peers/edit_peer_invite_link.cpp
index 17df8b965..6064d9208 100644
--- a/Telegram/SourceFiles/boxes/peers/edit_peer_invite_link.cpp
+++ b/Telegram/SourceFiles/boxes/peers/edit_peer_invite_link.cpp
@@ -409,7 +409,7 @@ void Controller::addHeaderBlock(not_null<Ui::VerticalLayout*> container) {
 		return result;
 	};
 
-	const auto prefix = qstr("https://");
+	const auto prefix = u"https://"_q;
 	const auto label = container->lifetime().make_state<Ui::InviteLinkLabel>(
 		container,
 		rpl::single(link.startsWith(prefix)
@@ -982,7 +982,7 @@ void AddPermanentLinkBlock(
 
 	auto link = value->value(
 	) | rpl::map([=](const LinkData &data) {
-		const auto prefix = qstr("https://");
+		const auto prefix = u"https://"_q;
 		return data.link.startsWith(prefix)
 			? data.link.mid(prefix.size())
 			: data.link;
diff --git a/Telegram/SourceFiles/boxes/peers/edit_peer_invite_links.cpp b/Telegram/SourceFiles/boxes/peers/edit_peer_invite_links.cpp
index 4b3f3b7b5..96fd20789 100644
--- a/Telegram/SourceFiles/boxes/peers/edit_peer_invite_links.cpp
+++ b/Telegram/SourceFiles/boxes/peers/edit_peer_invite_links.cpp
@@ -312,13 +312,13 @@ QString Row::generateName() {
 	}
 	auto result = _data.link;
 	return result.replace(
-		qstr("https://"),
+		u"https://"_q,
 		QString()
 	).replace(
-		qstr("t.me/+"),
+		u"t.me/+"_q,
 		QString()
 	).replace(
-		qstr("t.me/joinchat/"),
+		u"t.me/joinchat/"_q,
 		QString()
 	);
 }
diff --git a/Telegram/SourceFiles/boxes/peers/edit_peer_reactions.cpp b/Telegram/SourceFiles/boxes/peers/edit_peer_reactions.cpp
index 190c49a1c..5a09a25d9 100644
--- a/Telegram/SourceFiles/boxes/peers/edit_peer_reactions.cpp
+++ b/Telegram/SourceFiles/boxes/peers/edit_peer_reactions.cpp
@@ -282,7 +282,7 @@ void SaveAllowedReactions(
 			Unexpected("Invalid peer type in SaveAllowedReactions.");
 		}
 	}).fail([=](const MTP::Error &error) {
-		if (error.type() == qstr("REACTION_INVALID")) {
+		if (error.type() == u"REACTION_INVALID"_q) {
 			peer->updateFullForced();
 			peer->owner().reactions().refreshDefault();
 		}
diff --git a/Telegram/SourceFiles/boxes/peers/edit_peer_type_box.cpp b/Telegram/SourceFiles/boxes/peers/edit_peer_type_box.cpp
index 049cc9e5b..7b53ba217 100644
--- a/Telegram/SourceFiles/boxes/peers/edit_peer_type_box.cpp
+++ b/Telegram/SourceFiles/boxes/peers/edit_peer_type_box.cpp
@@ -538,7 +538,7 @@ void Controller::checkUsernameAvailability() {
 	}
 	const auto initial = (_controls.privacy->value() != Privacy::HasUsername);
 	const auto checking = initial
-		? qsl(".bad.")
+		? u".bad."_q
 		: getUsernameInput();
 	if (checking.size() < Ui::EditPeer::kMinUsernameLength) {
 		return;
@@ -565,10 +565,10 @@ void Controller::checkUsernameAvailability() {
 		_checkUsernameRequestId = 0;
 		const auto &type = error.type();
 		_usernameState = UsernameState::Normal;
-		if (type == qstr("CHANNEL_PUBLIC_GROUP_NA")) {
+		if (type == u"CHANNEL_PUBLIC_GROUP_NA"_q) {
 			_usernameState = UsernameState::NotAvailable;
 			_controls.privacy->setValue(Privacy::NoUsername);
-		} else if (type == qstr("CHANNELS_ADMIN_PUBLIC_TOO_MUCH")) {
+		} else if (type == u"CHANNELS_ADMIN_PUBLIC_TOO_MUCH"_q) {
 			_usernameState = UsernameState::TooMany;
 			if (_controls.privacy->value() == Privacy::HasUsername) {
 				askUsernameRevoke();
@@ -578,10 +578,9 @@ void Controller::checkUsernameAvailability() {
 				_controls.usernameResult = nullptr;
 				setFocusUsername();
 			}
-		} else if (type == qstr("USERNAME_INVALID")) {
+		} else if (type == u"USERNAME_INVALID"_q) {
 			showUsernameError(tr::lng_create_channel_link_invalid());
-		} else if (type == qstr("USERNAME_OCCUPIED")
-			&& checking != username) {
+		} else if (type == u"USERNAME_OCCUPIED"_q && checking != username) {
 			showUsernameError(tr::lng_create_channel_link_occupied());
 		}
 	}).send();
diff --git a/Telegram/SourceFiles/boxes/stickers_box.cpp b/Telegram/SourceFiles/boxes/stickers_box.cpp
index 2a01f8be8..8ce42517d 100644
--- a/Telegram/SourceFiles/boxes/stickers_box.cpp
+++ b/Telegram/SourceFiles/boxes/stickers_box.cpp
@@ -1993,15 +1993,15 @@ void StickersBox::Inner::AddressField::correctValue(
 	auto newText = now;
 	auto newCursor = nowCursor;
 	auto removeFromBeginning = {
-		qstr("http://"),
-		qstr("https://"),
-		qstr("www.t.me/"),
-		qstr("www.telegram.me/"),
-		qstr("www.telegram.dog/"),
-		qstr("t.me/"),
-		qstr("telegram.me/"),
-		qstr("telegram.dog/"),
-		qstr("addstickers/"),
+		u"http://"_q,
+		u"https://"_q,
+		u"www.t.me/"_q,
+		u"www.telegram.me/"_q,
+		u"www.telegram.dog/"_q,
+		u"t.me/"_q,
+		u"telegram.me/"_q,
+		u"telegram.dog/"_q,
+		u"addstickers/"_q,
 	};
 	for (auto &removePhrase : removeFromBeginning) {
 		if (newText.startsWith(removePhrase)) {
diff --git a/Telegram/SourceFiles/boxes/username_box.cpp b/Telegram/SourceFiles/boxes/username_box.cpp
index 3b8f3ed35..24ddba564 100644
--- a/Telegram/SourceFiles/boxes/username_box.cpp
+++ b/Telegram/SourceFiles/boxes/username_box.cpp
@@ -93,7 +93,7 @@ UsernameEditor::UsernameEditor(
 , _username(
 	this,
 	st::defaultInputField,
-	rpl::single(qsl("@username")),
+	rpl::single(u"@username"_q),
 	session->user()->editableUsername(),
 	QString())
 , _checkTimer([=] { check(); }) {
@@ -260,7 +260,7 @@ void UsernameEditor::checkInfoPurchaseAvailable() {
 
 void UsernameEditor::updateFail(const QString &error) {
 	const auto self = _session->user();
-	if ((error == qstr("USERNAME_NOT_MODIFIED"))
+	if ((error == u"USERNAME_NOT_MODIFIED"_q)
 		|| (_sentUsername == self->editableUsername())) {
 		self->setName(
 			TextUtilities::SingleLine(self->firstName),
@@ -268,18 +268,18 @@ void UsernameEditor::updateFail(const QString &error) {
 			TextUtilities::SingleLine(self->nameOrPhone),
 			TextUtilities::SingleLine(_sentUsername));
 		_saved.fire_done();
-	} else if (error == qstr("USERNAME_INVALID")) {
+	} else if (error == u"USERNAME_INVALID"_q) {
 		_username->setFocus();
 		_username->showError();
 		_errorText = tr::lng_username_invalid(tr::now);
 		checkInfoChange();
-	} else if ((error == qstr("USERNAME_OCCUPIED"))
-		|| (error == qstr("USERNAMES_UNAVAILABLE"))) {
+	} else if ((error == u"USERNAME_OCCUPIED"_q)
+		|| (error == u"USERNAMES_UNAVAILABLE"_q)) {
 		_username->setFocus();
 		_username->showError();
 		_errorText = tr::lng_username_occupied(tr::now);
 		checkInfoChange();
-	} else if (error == qstr("USERNAME_PURCHASE_AVAILABLE")) {
+	} else if (error == u"USERNAME_PURCHASE_AVAILABLE"_q) {
 		checkInfoPurchaseAvailable();
 	} else {
 		_username->setFocus();
@@ -287,14 +287,14 @@ void UsernameEditor::updateFail(const QString &error) {
 }
 
 void UsernameEditor::checkFail(const QString &error) {
-	if (error == qstr("USERNAME_INVALID")) {
+	if (error == u"USERNAME_INVALID"_q) {
 		_errorText = tr::lng_username_invalid(tr::now);
 		checkInfoChange();
-	} else if ((error == qstr("USERNAME_OCCUPIED"))
+	} else if ((error == u"USERNAME_OCCUPIED"_q)
 		&& (_checkUsername != _session->user()->editableUsername())) {
 		_errorText = tr::lng_username_occupied(tr::now);
 		checkInfoChange();
-	} else if (error == qstr("USERNAME_PURCHASE_AVAILABLE")) {
+	} else if (error == u"USERNAME_PURCHASE_AVAILABLE"_q) {
 		checkInfoPurchaseAvailable();
 	} else {
 		_goodText = QString();
diff --git a/Telegram/SourceFiles/chat_helpers/emoji_keywords.cpp b/Telegram/SourceFiles/chat_helpers/emoji_keywords.cpp
index 982556729..fcb8bd8f7 100644
--- a/Telegram/SourceFiles/chat_helpers/emoji_keywords.cpp
+++ b/Telegram/SourceFiles/chat_helpers/emoji_keywords.cpp
@@ -55,19 +55,19 @@ struct LangPackData {
 		const QString &word) {
 	if ((word.size() == 1) && !word[0].isLetter()) {
 		return true;
-	} else if (word == qstr("10")) {
+	} else if (word == u"10"_q) {
 		return true;
-	} else if (language != qstr("en")) {
+	} else if (language != u"en"_q) {
 		return false;
 	} else if ((word.size() == 1)
 		&& (word[0] != '$')
 		&& (word[0].unicode() != 8364)) { // Euro.
 		return true;
 	} else if ((word.size() == 2)
-		&& (word != qstr("us"))
-		&& (word != qstr("uk"))
-		&& (word != qstr("hi"))
-		&& (word != qstr("ok"))) {
+		&& (word != u"us"_q)
+		&& (word != u"uk"_q)
+		&& (word != u"hi"_q)
+		&& (word != u"ok"_q)) {
 		return true;
 	}
 	return false;
@@ -80,7 +80,7 @@ struct LangPackData {
 }
 
 void CreateCacheFilePath() {
-	QDir().mkpath(internal::CacheFileFolder() + qstr("/keywords"));
+	QDir().mkpath(internal::CacheFileFolder() + u"/keywords"_q);
 }
 
 [[nodiscard]] QString CacheFilePath(QString id) {
@@ -89,7 +89,7 @@ void CreateCacheFilePath() {
 	if (id.isEmpty()) {
 		return QString();
 	}
-	return internal::CacheFileFolder() + qstr("/keywords/") + id;
+	return internal::CacheFileFolder() + u"/keywords/"_q + id;
 }
 
 [[nodiscard]] LangPackData ReadLocalCache(const QString &id) {
diff --git a/Telegram/SourceFiles/chat_helpers/emoji_sets_manager.cpp b/Telegram/SourceFiles/chat_helpers/emoji_sets_manager.cpp
index 831a9ca96..1b3f24d36 100644
--- a/Telegram/SourceFiles/chat_helpers/emoji_sets_manager.cpp
+++ b/Telegram/SourceFiles/chat_helpers/emoji_sets_manager.cpp
@@ -153,9 +153,8 @@ QString StateDescription(const SetState &state) {
 }
 
 bool GoodSetPartName(const QString &name) {
-	return (name == qstr("config.json"))
-		|| (name.startsWith(qstr("emoji_"))
-			&& name.endsWith(qstr(".webp")));
+	return (name == u"config.json"_q)
+		|| (name.startsWith(u"emoji_"_q) && name.endsWith(u".webp"_q));
 }
 
 bool UnpackSet(const QString &path, const QString &folder) {
diff --git a/Telegram/SourceFiles/chat_helpers/message_field.cpp b/Telegram/SourceFiles/chat_helpers/message_field.cpp
index 30ee76754..f5c21ae72 100644
--- a/Telegram/SourceFiles/chat_helpers/message_field.cpp
+++ b/Telegram/SourceFiles/chat_helpers/message_field.cpp
@@ -435,7 +435,7 @@ InlineBotQuery ParseInlineBotQuery(
 		auto inlineUsernameEqualsText = (inlineUsernameEnd == textLength);
 		auto validInlineUsername = false;
 		if (inlineUsernameEqualsText) {
-			validInlineUsername = text.endsWith(qstr("bot"));
+			validInlineUsername = text.endsWith(u"bot"_q);
 		} else if (inlineUsernameEnd < textLength && inlineUsernameLength) {
 			validInlineUsername = text[inlineUsernameEnd].isSpace();
 		}
diff --git a/Telegram/SourceFiles/core/application.cpp b/Telegram/SourceFiles/core/application.cpp
index 06652a540..4719a6870 100644
--- a/Telegram/SourceFiles/core/application.cpp
+++ b/Telegram/SourceFiles/core/application.cpp
@@ -570,7 +570,7 @@ bool Application::eventFilter(QObject *object, QEvent *e) {
 			const auto event = static_cast<QFileOpenEvent*>(e);
 			const auto url = QString::fromUtf8(
 				event->url().toEncoded().trimmed());
-			if (url.startsWith(qstr("tg://"), Qt::CaseInsensitive)) {
+			if (url.startsWith(u"tg://"_q, Qt::CaseInsensitive)) {
 				cSetStartUrl(url.mid(0, 8192));
 				checkStartUrl();
 			}
diff --git a/Telegram/SourceFiles/core/click_handler_types.cpp b/Telegram/SourceFiles/core/click_handler_types.cpp
index abfecd48d..906d11b03 100644
--- a/Telegram/SourceFiles/core/click_handler_types.cpp
+++ b/Telegram/SourceFiles/core/click_handler_types.cpp
@@ -77,17 +77,17 @@ bool UrlRequiresConfirmation(const QUrl &url) {
 }
 
 QString HiddenUrlClickHandler::copyToClipboardText() const {
-	return url().startsWith(qstr("internal:url:"))
-		? url().mid(qstr("internal:url:").size())
+	return url().startsWith(u"internal:url:"_q)
+		? url().mid(u"internal:url:"_q.size())
 		: url();
 }
 
 QString HiddenUrlClickHandler::copyToClipboardContextItemText() const {
 	return url().isEmpty()
 		? QString()
-		: !url().startsWith(qstr("internal:"))
+		: !url().startsWith(u"internal:"_q)
 		? UrlClickHandler::copyToClipboardContextItemText()
-		: url().startsWith(qstr("internal:url:"))
+		: url().startsWith(u"internal:url:"_q)
 		? UrlClickHandler::copyToClipboardContextItemText()
 		: QString();
 }
@@ -105,8 +105,8 @@ void HiddenUrlClickHandler::Open(QString url, QVariant context) {
 	const auto open = [=] {
 		UrlClickHandler::Open(url, context);
 	};
-	if (url.startsWith(qstr("tg://"), Qt::CaseInsensitive)
-		|| url.startsWith(qstr("internal:"), Qt::CaseInsensitive)) {
+	if (url.startsWith(u"tg://"_q, Qt::CaseInsensitive)
+		|| url.startsWith(u"internal:"_q, Qt::CaseInsensitive)) {
 		open();
 	} else {
 		const auto parsedUrl = QUrl::fromUserInput(url);
@@ -158,7 +158,7 @@ void BotGameUrlClickHandler::onClick(ClickContext context) const {
 	const auto open = [=] {
 		UrlClickHandler::Open(url, context.other);
 	};
-	if (url.startsWith(qstr("tg://"), Qt::CaseInsensitive)) {
+	if (url.startsWith(u"tg://"_q, Qt::CaseInsensitive)) {
 		open();
 	} else if (!_bot
 		|| _bot->isVerified()
diff --git a/Telegram/SourceFiles/core/file_utilities.cpp b/Telegram/SourceFiles/core/file_utilities.cpp
index f90b7ed28..a5bfd3038 100644
--- a/Telegram/SourceFiles/core/file_utilities.cpp
+++ b/Telegram/SourceFiles/core/file_utilities.cpp
@@ -210,7 +210,7 @@ void UnsafeOpenUrlDefault(const QString &url) {
 }
 
 void UnsafeOpenEmailLinkDefault(const QString &email) {
-	auto url = QUrl(qstr("mailto:") + email);
+	auto url = QUrl(u"mailto:"_q + email);
 	QDesktopServices::openUrl(url);
 }
 
diff --git a/Telegram/SourceFiles/core/launcher.cpp b/Telegram/SourceFiles/core/launcher.cpp
index 337d55955..4f611d805 100644
--- a/Telegram/SourceFiles/core/launcher.cpp
+++ b/Telegram/SourceFiles/core/launcher.cpp
@@ -228,7 +228,7 @@ bool CheckPortableVersionFolder() {
 		Assert(*AlphaPrivateKey != 0);
 
 		cForceWorkingDir(portable + '/');
-		QDir().mkpath(cWorkingDir() + qstr("tdata"));
+		QDir().mkpath(cWorkingDir() + u"tdata"_q);
 		cSetAlphaPrivateKey(QByteArray(AlphaPrivateKey));
 		if (!key.open(QIODevice::WriteOnly)) {
 			LOG(("FATAL: Could not open '%1' for writing private key!"
diff --git a/Telegram/SourceFiles/core/mime_type.cpp b/Telegram/SourceFiles/core/mime_type.cpp
index 0f4bfc202..c93ffb871 100644
--- a/Telegram/SourceFiles/core/mime_type.cpp
+++ b/Telegram/SourceFiles/core/mime_type.cpp
@@ -57,18 +57,18 @@ QString MimeType::name() const {
 }
 
 MimeType MimeTypeForName(const QString &mime) {
-	if (mime == qstr("image/webp")) {
+	if (mime == u"image/webp"_q) {
 		return MimeType(MimeType::Known::WebP);
-	} else if (mime == qstr("application/x-tgsticker")) {
+	} else if (mime == u"application/x-tgsticker"_q) {
 		return MimeType(MimeType::Known::Tgs);
-	} else if (mime == qstr("application/x-tgwallpattern")) {
+	} else if (mime == u"application/x-tgwallpattern"_q) {
 		return MimeType(MimeType::Known::Tgv);
-	} else if (mime == qstr("application/x-tdesktop-theme")
-		|| mime == qstr("application/x-tgtheme-tdesktop")) {
+	} else if (mime == u"application/x-tdesktop-theme"_q
+		|| mime == u"application/x-tgtheme-tdesktop"_q) {
 		return MimeType(MimeType::Known::TDesktopTheme);
-	} else if (mime == qstr("application/x-tdesktop-palette")) {
+	} else if (mime == u"application/x-tdesktop-palette"_q) {
 		return MimeType(MimeType::Known::TDesktopPalette);
-	} else if (mime == qstr("audio/mpeg3")) {
+	} else if (mime == u"audio/mpeg3"_q) {
 		return MimeType(QMimeDatabase().mimeTypeForName("audio/mp3"));
 	}
 	return MimeType(QMimeDatabase().mimeTypeForName(mime));
@@ -76,15 +76,15 @@ MimeType MimeTypeForName(const QString &mime) {
 
 MimeType MimeTypeForFile(const QFileInfo &file) {
 	QString path = file.absoluteFilePath();
-	if (path.endsWith(qstr(".webp"), Qt::CaseInsensitive)) {
+	if (path.endsWith(u".webp"_q, Qt::CaseInsensitive)) {
 		return MimeType(MimeType::Known::WebP);
-	} else if (path.endsWith(qstr(".tgs"), Qt::CaseInsensitive)) {
+	} else if (path.endsWith(u".tgs"_q, Qt::CaseInsensitive)) {
 		return MimeType(MimeType::Known::Tgs);
-	} else if (path.endsWith(qstr(".tgv"))) {
+	} else if (path.endsWith(u".tgv"_q)) {
 		return MimeType(MimeType::Known::Tgv);
-	} else if (path.endsWith(qstr(".tdesktop-theme"), Qt::CaseInsensitive)) {
+	} else if (path.endsWith(u".tdesktop-theme"_q, Qt::CaseInsensitive)) {
 		return MimeType(MimeType::Known::TDesktopTheme);
-	} else if (path.endsWith(qstr(".tdesktop-palette"), Qt::CaseInsensitive)) {
+	} else if (path.endsWith(u".tdesktop-palette"_q, Qt::CaseInsensitive)) {
 		return MimeType(MimeType::Known::TDesktopPalette);
 	}
 
@@ -138,18 +138,18 @@ bool IsMimeAcceptedForPhotoVideoAlbum(const QString &mime) {
 
 bool FileIsImage(const QString &name, const QString &mime) {
 	QString lowermime = mime.toLower(), namelower = name.toLower();
-	if (lowermime.startsWith(qstr("image/"))) {
+	if (lowermime.startsWith(u"image/"_q)) {
 		return true;
-	} else if (namelower.endsWith(qstr(".bmp"))
-		|| namelower.endsWith(qstr(".jpg"))
-		|| namelower.endsWith(qstr(".jpeg"))
-		|| namelower.endsWith(qstr(".gif"))
-		|| namelower.endsWith(qstr(".webp"))
-		|| namelower.endsWith(qstr(".tga"))
-		|| namelower.endsWith(qstr(".tiff"))
-		|| namelower.endsWith(qstr(".tif"))
-		|| namelower.endsWith(qstr(".psd"))
-		|| namelower.endsWith(qstr(".png"))) {
+	} else if (namelower.endsWith(u".bmp"_q)
+		|| namelower.endsWith(u".jpg"_q)
+		|| namelower.endsWith(u".jpeg"_q)
+		|| namelower.endsWith(u".gif"_q)
+		|| namelower.endsWith(u".webp"_q)
+		|| namelower.endsWith(u".tga"_q)
+		|| namelower.endsWith(u".tiff"_q)
+		|| namelower.endsWith(u".tif"_q)
+		|| namelower.endsWith(u".psd"_q)
+		|| namelower.endsWith(u".png"_q)) {
 		return true;
 	}
 	return false;
diff --git a/Telegram/SourceFiles/core/ui_integration.cpp b/Telegram/SourceFiles/core/ui_integration.cpp
index f205709d4..5b0eef3fa 100644
--- a/Telegram/SourceFiles/core/ui_integration.cpp
+++ b/Telegram/SourceFiles/core/ui_integration.cpp
@@ -226,10 +226,10 @@ bool UiIntegration::handleUrlClick(
 	if (UrlClickHandler::IsEmail(url)) {
 		File::OpenEmailLink(url);
 		return true;
-	} else if (local.startsWith(qstr("tg://"), Qt::CaseInsensitive)) {
+	} else if (local.startsWith(u"tg://"_q, Qt::CaseInsensitive)) {
 		Core::App().openLocalUrl(local, context);
 		return true;
-	} else if (local.startsWith(qstr("internal:"), Qt::CaseInsensitive)) {
+	} else if (local.startsWith(u"internal:"_q, Qt::CaseInsensitive)) {
 		Core::App().openInternalUrl(local, context);
 		return true;
 	}
diff --git a/Telegram/SourceFiles/data/data_cloud_themes.cpp b/Telegram/SourceFiles/data/data_cloud_themes.cpp
index 8d00aba8c..5ac1c2052 100644
--- a/Telegram/SourceFiles/data/data_cloud_themes.cpp
+++ b/Telegram/SourceFiles/data/data_cloud_themes.cpp
@@ -221,7 +221,7 @@ void CloudThemes::resolve(
 	)).done([=](const MTPTheme &result) {
 		showPreview(controller, result);
 	}).fail([=](const MTP::Error &error) {
-		if (error.type() == qstr("THEME_FORMAT_INVALID")) {
+		if (error.type() == u"THEME_FORMAT_INVALID"_q) {
 			controller->show(Ui::MakeInformBox(tr::lng_theme_no_desktop()));
 		}
 	}).send();
diff --git a/Telegram/SourceFiles/data/data_document.cpp b/Telegram/SourceFiles/data/data_document.cpp
index f364bdd9e..7c679fb50 100644
--- a/Telegram/SourceFiles/data/data_document.cpp
+++ b/Telegram/SourceFiles/data/data_document.cpp
@@ -201,7 +201,7 @@ QString FileNameForSave(
 		dir);
 #ifdef Q_OS_WIN
 	const auto lower = result.trimmed().toLower();
-	const auto kBadExtensions = { qstr(".lnk"), qstr(".scf") };
+	const auto kBadExtensions = { u".lnk"_q, u".scf"_q };
 	const auto kMaskExtension = qsl(".download");
 	for (const auto extension : kBadExtensions) {
 		if (lower.endsWith(extension)) {
@@ -227,7 +227,7 @@ QString DocumentFileNameForSave(
 	QStringList p = mimeType.globPatterns();
 	QString pattern = p.isEmpty() ? QString() : p.front();
 	if (data->isVoiceMessage()) {
-		auto mp3 = data->hasMimeType(qstr("audio/mp3"));
+		auto mp3 = data->hasMimeType(u"audio/mp3"_q);
 		name = already.isEmpty() ? (mp3 ? qsl(".mp3") : qsl(".ogg")) : already;
 		filter = mp3 ? qsl("MP3 Audio (*.mp3);;") : qsl("OGG Opus Audio (*.ogg);;");
 		filter += FileDialog::AllFilesFilter();
@@ -430,7 +430,7 @@ void DocumentData::setattributes(
 		type = FileDocument;
 		_additional = nullptr;
 	} else if (type == FileDocument
-		&& hasMimeType(qstr("video/webm"))
+		&& hasMimeType(u"video/webm"_q)
 		&& (size < Storage::kMaxStickerBytesSize)
 		&& GoodStickerDimensions(dimensions.width(), dimensions.height())) {
 		type = StickerDocument;
@@ -444,7 +444,7 @@ void DocumentData::setattributes(
 
 void DocumentData::validateLottieSticker() {
 	if (type == FileDocument
-		&& hasMimeType(qstr("application/x-tgsticker"))) {
+		&& hasMimeType(u"application/x-tgsticker"_q)) {
 		type = StickerDocument;
 		_additional = std::make_unique<StickerData>();
 		sticker()->type = StickerType::Tgs;
@@ -532,11 +532,11 @@ bool DocumentData::isPatternWallPaper() const {
 }
 
 bool DocumentData::isPatternWallPaperPNG() const {
-	return isWallPaper() && hasMimeType(qstr("image/png"));
+	return isWallPaper() && hasMimeType(u"image/png"_q);
 }
 
 bool DocumentData::isPatternWallPaperSVG() const {
-	return isWallPaper() && hasMimeType(qstr("application/x-tgwallpattern"));
+	return isWallPaper() && hasMimeType(u"application/x-tgwallpattern"_q);
 }
 
 bool DocumentData::isPremiumSticker() const {
@@ -736,7 +736,7 @@ bool DocumentData::saveToCache() const {
 			|| isVoiceMessage()
 			|| isWallPaper()
 			|| isTheme()
-			|| (hasMimeType(qstr("image/png"))
+			|| (hasMimeType(u"image/png"_q)
 				&& _filename.startsWith("image_")));
 }
 
@@ -1157,7 +1157,7 @@ void DocumentData::refreshPossibleCoverThumbnail() {
 	if (songData->performer.isEmpty()
 		|| songData->title.isEmpty()
 		// Ignore cover for voice chat records.
-		|| hasMimeType(qstr("audio/ogg"))) {
+		|| hasMimeType(u"audio/ogg"_q)) {
 		return;
 	}
 	const auto size = kDefaultCoverThumbnailSize;
@@ -1375,7 +1375,7 @@ QString DocumentData::mimeString() const {
 	return _mimeString;
 }
 
-bool DocumentData::hasMimeType(QLatin1String mime) const {
+bool DocumentData::hasMimeType(const QString &mime) const {
 	return (_mimeString == mime);
 }
 
@@ -1438,19 +1438,19 @@ bool DocumentData::isVideoMessage() const {
 bool DocumentData::isAnimation() const {
 	return (type == AnimatedDocument)
 		|| isVideoMessage()
-		|| (hasMimeType(qstr("image/gif"))
+		|| (hasMimeType(u"image/gif"_q)
 			&& !(_flags & Flag::StreamingPlaybackFailed));
 }
 
 bool DocumentData::isGifv() const {
 	return (type == AnimatedDocument)
-		&& hasMimeType(qstr("video/mp4"));
+		&& hasMimeType(u"video/mp4"_q);
 }
 
 bool DocumentData::isTheme() const {
-	return hasMimeType(qstr("application/x-tgtheme-tdesktop"))
-		|| _filename.endsWith(qstr(".tdesktop-theme"), Qt::CaseInsensitive)
-		|| _filename.endsWith(qstr(".tdesktop-palette"), Qt::CaseInsensitive);
+	return hasMimeType(u"application/x-tgtheme-tdesktop"_q)
+		|| _filename.endsWith(u".tdesktop-theme"_q, Qt::CaseInsensitive)
+		|| _filename.endsWith(u".tdesktop-palette"_q, Qt::CaseInsensitive);
 }
 
 bool DocumentData::isSong() const {
@@ -1467,15 +1467,15 @@ bool DocumentData::isAudioFile() const {
 	} else if (isSong()) {
 		return true;
 	}
-	const auto prefix = qstr("audio/");
+	const auto prefix = u"audio/"_q;
 	if (!_mimeString.startsWith(prefix, Qt::CaseInsensitive)) {
-		if (_filename.endsWith(qstr(".opus"), Qt::CaseInsensitive)) {
+		if (_filename.endsWith(u".opus"_q, Qt::CaseInsensitive)) {
 			return true;
 		}
 		return false;
 	}
 	const auto left = _mimeString.mid(prefix.size());
-	const auto types = { qstr("x-wav"), qstr("wav"), qstr("mp4") };
+	const auto types = { u"x-wav"_q, u"wav"_q, u"mp4"_q };
 	return ranges::contains(types, left);
 }
 
diff --git a/Telegram/SourceFiles/data/data_document.h b/Telegram/SourceFiles/data/data_document.h
index 11f858251..b6fcd9477 100644
--- a/Telegram/SourceFiles/data/data_document.h
+++ b/Telegram/SourceFiles/data/data_document.h
@@ -249,7 +249,7 @@ public:
 
 	[[nodiscard]] QString filename() const;
 	[[nodiscard]] QString mimeString() const;
-	[[nodiscard]] bool hasMimeType(QLatin1String mime) const;
+	[[nodiscard]] bool hasMimeType(const QString &mime) const;
 	void setMimeString(const QString &mime);
 
 	[[nodiscard]] bool hasAttachedStickers() const;
diff --git a/Telegram/SourceFiles/data/data_histories.cpp b/Telegram/SourceFiles/data/data_histories.cpp
index 7325c4ada..7c80d75ac 100644
--- a/Telegram/SourceFiles/data/data_histories.cpp
+++ b/Telegram/SourceFiles/data/data_histories.cpp
@@ -640,7 +640,7 @@ void Histories::deleteAllMessages(
 			)).done([=](const MTPUpdates &result) {
 				session().api().applyUpdates(result);
 			//}).fail([=](const MTP::Error &error) {
-			//	if (error.type() == qstr("CHANNEL_TOO_LARGE")) {
+			//	if (error.type() == u"CHANNEL_TOO_LARGE"_q) {
 			//		Ui::show(Box<Ui::InformBox>(tr::lng_cant_delete_channel(tr::now)));
 			//	}
 			}).send();
diff --git a/Telegram/SourceFiles/data/data_media_types.cpp b/Telegram/SourceFiles/data/data_media_types.cpp
index d72ef26f5..3bb881583 100644
--- a/Telegram/SourceFiles/data/data_media_types.cpp
+++ b/Telegram/SourceFiles/data/data_media_types.cpp
@@ -283,7 +283,7 @@ TextForMimeData WithCaptionClipboardText(
 		TextForMimeData &&caption) {
 	auto result = TextForMimeData();
 	result.reserve(5 + attachType.size() + caption.expanded.size());
-	result.append(qstr("[ ")).append(attachType).append(qstr(" ]"));
+	result.append(u"[ "_q).append(attachType).append(u" ]"_q);
 	if (!caption.empty()) {
 		result.append('\n').append(std::move(caption));
 	}
@@ -914,7 +914,7 @@ TextForMimeData MediaFile::clipboardText() const {
 	const auto attachType = [&] {
 		const auto name = Ui::Text::FormatSongNameFor(_document).string();
 		const auto addName = !name.isEmpty()
-			? qstr(" : ") + name
+			? u" : "_q + name
 			: QString();
 		if (const auto sticker = _document->sticker()) {
 			if (!_emoji.isEmpty()) {
@@ -1245,7 +1245,7 @@ QString MediaLocation::pinnedTextSubstring() const {
 
 TextForMimeData MediaLocation::clipboardText() const {
 	auto result = TextForMimeData::Simple(
-		qstr("[ ") + tr::lng_maps_point(tr::now) + qstr(" ]\n"));
+		u"[ "_q + tr::lng_maps_point(tr::now) + u" ]\n"_q);
 	auto titleResult = TextUtilities::ParseEntities(
 		_title,
 		Ui::WebpageTextTitleOptions().flags);
@@ -1690,11 +1690,11 @@ QString MediaPoll::pinnedTextSubstring() const {
 }
 
 TextForMimeData MediaPoll::clipboardText() const {
-	const auto text = qstr("[ ")
+	const auto text = u"[ "_q
 		+ tr::lng_in_dlg_poll(tr::now)
-		+ qstr(" : ")
+		+ u" : "_q
 		+ _poll->question
-		+ qstr(" ]")
+		+ u" ]"_q
 		+ ranges::accumulate(
 			ranges::views::all(
 				_poll->answers
diff --git a/Telegram/SourceFiles/data/data_session.cpp b/Telegram/SourceFiles/data/data_session.cpp
index bb0390cdf..a4c4aadb9 100644
--- a/Telegram/SourceFiles/data/data_session.cpp
+++ b/Telegram/SourceFiles/data/data_session.cpp
@@ -140,11 +140,11 @@ std::vector<UnavailableReason> ExtractUnavailableReasons(
 			const auto platform = qs(data.vplatform());
 			return false
 #ifdef OS_MAC_STORE
-				|| (platform == qstr("ios"))
+				|| (platform == u"ios"_q)
 #elif defined OS_WIN_STORE // OS_MAC_STORE
-				|| (platform == qstr("ms"))
+				|| (platform == u"ms"_q)
 #endif // OS_MAC_STORE || OS_WIN_STORE
-				|| (platform == qstr("all"));
+				|| (platform == u"all"_q);
 		});
 	}) | ranges::views::transform([](const MTPRestrictionReason &restriction) {
 		return restriction.match([&](const MTPDrestrictionReason &data) {
@@ -3258,7 +3258,7 @@ void Session::webpageApplyFields(
 	};
 	const auto siteName = qs(data.vsite_name().value_or_empty());
 	auto parseFlags = TextParseLinks | TextParseMultiline;
-	if (siteName == qstr("Twitter") || siteName == qstr("Instagram")) {
+	if (siteName == u"Twitter"_q || siteName == u"Instagram"_q) {
 		parseFlags |= TextParseHashtags | TextParseMentions;
 	}
 	TextUtilities::ParseEntities(description, parseFlags);
diff --git a/Telegram/SourceFiles/data/data_wall_paper.cpp b/Telegram/SourceFiles/data/data_wall_paper.cpp
index 5b4f06781..b2313f169 100644
--- a/Telegram/SourceFiles/data/data_wall_paper.cpp
+++ b/Telegram/SourceFiles/data/data_wall_paper.cpp
@@ -348,7 +348,7 @@ WallPaper WallPaper::withUrlParams(
 	if (auto mode = params.value("mode"); !mode.isEmpty()) {
 		const auto list = mode.replace('+', ' ').split(' ');
 		for (const auto &change : list) {
-			if (change == qstr("blur")) {
+			if (change == u"blur"_q) {
 				result._blurred = true;
 			}
 		}
diff --git a/Telegram/SourceFiles/data/data_web_page.cpp b/Telegram/SourceFiles/data/data_web_page.cpp
index 64957ae02..ecdd9092d 100644
--- a/Telegram/SourceFiles/data/data_web_page.cpp
+++ b/Telegram/SourceFiles/data/data_web_page.cpp
@@ -137,35 +137,35 @@ WebPageType ParseWebPageType(
 		const QString &type,
 		const QString &embedUrl,
 		bool hasIV) {
-	if (type == qstr("video") || !embedUrl.isEmpty()) {
+	if (type == u"video"_q || !embedUrl.isEmpty()) {
 		return WebPageType::Video;
-	} else if (type == qstr("photo")) {
+	} else if (type == u"photo"_q) {
 		return WebPageType::Photo;
-	} else if (type == qstr("profile")) {
+	} else if (type == u"profile"_q) {
 		return WebPageType::Profile;
-	} else if (type == qstr("telegram_background")) {
+	} else if (type == u"telegram_background"_q) {
 		return WebPageType::WallPaper;
-	} else if (type == qstr("telegram_theme")) {
+	} else if (type == u"telegram_theme"_q) {
 		return WebPageType::Theme;
-	} else if (type == qstr("telegram_channel")) {
+	} else if (type == u"telegram_channel"_q) {
 		return WebPageType::Channel;
-	} else if (type == qstr("telegram_channel_request")) {
+	} else if (type == u"telegram_channel_request"_q) {
 		return WebPageType::ChannelWithRequest;
-	} else if (type == qstr("telegram_megagroup")
-		|| type == qstr("telegram_chat")) {
+	} else if (type == u"telegram_megagroup"_q
+		|| type == u"telegram_chat"_q) {
 		return WebPageType::Group;
-	} else if (type == qstr("telegram_megagroup_request")
-		|| type == qstr("telegram_chat_request")) {
+	} else if (type == u"telegram_megagroup_request"_q
+		|| type == u"telegram_chat_request"_q) {
 		return WebPageType::GroupWithRequest;
-	}  else if (type == qstr("telegram_message")) {
+	}  else if (type == u"telegram_message"_q) {
 		return WebPageType::Message;
-	}  else if (type == qstr("telegram_bot")) {
+	}  else if (type == u"telegram_bot"_q) {
 		return WebPageType::Bot;
-	}  else if (type == qstr("telegram_voicechat")) {
+	}  else if (type == u"telegram_voicechat"_q) {
 		return WebPageType::VoiceChat;
-	}  else if (type == qstr("telegram_livestream")) {
+	}  else if (type == u"telegram_livestream"_q) {
 		return WebPageType::Livestream;
-	}  else if (type == qstr("telegram_user")) {
+	}  else if (type == u"telegram_user"_q) {
 		return WebPageType::User;
 	} else if (hasIV) {
 		return WebPageType::ArticleWithIV;
diff --git a/Telegram/SourceFiles/data/stickers/data_stickers.cpp b/Telegram/SourceFiles/data/stickers/data_stickers.cpp
index c9f474931..ea22578a5 100644
--- a/Telegram/SourceFiles/data/stickers/data_stickers.cpp
+++ b/Telegram/SourceFiles/data/stickers/data_stickers.cpp
@@ -1620,7 +1620,8 @@ void Stickers::newSetReceived(const MTPDmessages_stickerSet &set) {
 
 QString Stickers::getSetTitle(const MTPDstickerSet &s) {
 	auto title = qs(s.vtitle());
-	if ((s.vflags().v & MTPDstickerSet::Flag::f_official) && !title.compare(qstr("Great Minds"), Qt::CaseInsensitive)) {
+	if ((s.vflags().v & MTPDstickerSet::Flag::f_official)
+		&& !title.compare(u"Great Minds"_q, Qt::CaseInsensitive)) {
 		return tr::lng_stickers_default_set(tr::now);
 	}
 	return title;
diff --git a/Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp b/Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp
index 11f607751..060d5e62f 100644
--- a/Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp
+++ b/Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp
@@ -2149,7 +2149,7 @@ void InnerWidget::parentGeometryChanged() {
 }
 
 void InnerWidget::applyFilterUpdate(QString newFilter, bool force) {
-	const auto mentionsSearch = (newFilter == qstr("@"));
+	const auto mentionsSearch = (newFilter == u"@"_q);
 	const auto words = mentionsSearch
 		? QStringList(newFilter)
 		: TextUtilities::PrepareSearchWords(newFilter);
diff --git a/Telegram/SourceFiles/dialogs/dialogs_widget.cpp b/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
index 0292dcaf6..3bfe85d80 100644
--- a/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
+++ b/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
@@ -1729,7 +1729,7 @@ void Widget::searchFailed(
 		SearchRequestType type,
 		const MTP::Error &error,
 		mtpRequestId requestId) {
-	if (error.type() == qstr("SEARCH_QUERY_EMPTY")) {
+	if (error.type() == u"SEARCH_QUERY_EMPTY"_q) {
 		searchReceived(
 			type,
 			MTP_messages_messages(
diff --git a/Telegram/SourceFiles/export/data/export_data_types.cpp b/Telegram/SourceFiles/export/data/export_data_types.cpp
index 13bc81aa8..11b9b50fc 100644
--- a/Telegram/SourceFiles/export/data/export_data_types.cpp
+++ b/Telegram/SourceFiles/export/data/export_data_types.cpp
@@ -325,13 +325,13 @@ QString ComputeDocumentName(
 	}
 	const auto mimeString = QString::fromUtf8(data.mime);
 	const auto mimeType = Core::MimeTypeForName(mimeString);
-	const auto hasMimeType = [&](QLatin1String mime) {
+	const auto hasMimeType = [&](const auto &mime) {
 		return !mimeString.compare(mime, Qt::CaseInsensitive);
 	};
 	const auto patterns = mimeType.globPatterns();
 	const auto pattern = patterns.isEmpty() ? QString() : patterns.front();
 	if (data.isVoiceMessage) {
-		const auto isMP3 = hasMimeType(qstr("audio/mp3"));
+		const auto isMP3 = hasMimeType(u"audio/mp3"_q);
 		return qsl("audio_")
 			+ QString::number(++context.audios)
 			+ PrepareFileNameDatePart(date)
diff --git a/Telegram/SourceFiles/export/export_api_wrap.cpp b/Telegram/SourceFiles/export/export_api_wrap.cpp
index 6910955a0..3e31914d4 100644
--- a/Telegram/SourceFiles/export/export_api_wrap.cpp
+++ b/Telegram/SourceFiles/export/export_api_wrap.cpp
@@ -367,7 +367,7 @@ auto ApiWrap::fileRequest(const Data::FileLocation &location, int64 offset) {
 			MTP_int(kFileChunkSize))
 	)).fail([=](const MTP::Error &result) {
 		_fileProcess->requestId = 0;
-		if (result.type() == qstr("TAKEOUT_FILE_EMPTY")
+		if (result.type() == u"TAKEOUT_FILE_EMPTY"_q
 			&& _otherDataProcess != nullptr) {
 			filePartDone(
 				0,
@@ -375,12 +375,12 @@ auto ApiWrap::fileRequest(const Data::FileLocation &location, int64 offset) {
 					MTP_storage_filePartial(),
 					MTP_int(0),
 					MTP_bytes()));
-		} else if (result.type() == qstr("LOCATION_INVALID")
-			|| result.type() == qstr("VERSION_INVALID")
-			|| result.type() == qstr("LOCATION_NOT_AVAILABLE")) {
+		} else if (result.type() == u"LOCATION_INVALID"_q
+			|| result.type() == u"VERSION_INVALID"_q
+			|| result.type() == u"LOCATION_NOT_AVAILABLE"_q) {
 			filePartUnavailable();
 		} else if (result.code() == 400
-			&& result.type().startsWith(qstr("FILE_REFERENCE_"))) {
+			&& result.type().startsWith(u"FILE_REFERENCE_"_q)) {
 			filePartRefreshReference(offset);
 		} else {
 			error(std::move(result));
@@ -1443,7 +1443,7 @@ void ApiWrap::requestChatMessages(
 		)).fail([=](const MTP::Error &error) {
 			Expects(_chatProcess != nullptr);
 
-			if (error.type() == qstr("CHANNEL_PRIVATE")) {
+			if (error.type() == u"CHANNEL_PRIVATE"_q) {
 				if (realPeerInput.type() == mtpc_inputPeerChannel
 					&& !_chatProcess->info.onlyMyMessages) {
 
diff --git a/Telegram/SourceFiles/export/output/export_output_html.cpp b/Telegram/SourceFiles/export/output/export_output_html.cpp
index 020b65c7c..da1619a37 100644
--- a/Telegram/SourceFiles/export/output/export_output_html.cpp
+++ b/Telegram/SourceFiles/export/output/export_output_html.cpp
@@ -44,8 +44,8 @@ using PeersMap = details::PeersMap;
 using MediaData = details::MediaData;
 
 bool IsGlobalLink(const QString &link) {
-	return link.startsWith(qstr("http://"), Qt::CaseInsensitive)
-		|| link.startsWith(qstr("https://"), Qt::CaseInsensitive);
+	return link.startsWith(u"http://"_q, Qt::CaseInsensitive)
+		|| link.startsWith(u"https://"_q, Qt::CaseInsensitive);
 }
 
 QByteArray NoFileDescription(Data::File::SkipReason reason) {
diff --git a/Telegram/SourceFiles/export/view/export_view_panel_controller.cpp b/Telegram/SourceFiles/export/view/export_view_panel_controller.cpp
index c0e5f0043..24293ca84 100644
--- a/Telegram/SourceFiles/export/view/export_view_panel_controller.cpp
+++ b/Telegram/SourceFiles/export/view/export_view_panel_controller.cpp
@@ -220,12 +220,12 @@ void PanelController::showSettings() {
 void PanelController::showError(const ApiErrorState &error) {
 	LOG(("Export Info: API Error '%1'.").arg(error.data.type()));
 
-	if (error.data.type() == qstr("TAKEOUT_INVALID")) {
+	if (error.data.type() == u"TAKEOUT_INVALID"_q) {
 		showError(tr::lng_export_invalid(tr::now));
-	} else if (error.data.type().startsWith(qstr("TAKEOUT_INIT_DELAY_"))) {
+	} else if (error.data.type().startsWith(u"TAKEOUT_INIT_DELAY_"_q)) {
 		const auto seconds = std::max(base::StringViewMid(
 			error.data.type(),
-			qstr("TAKEOUT_INIT_DELAY_").size()).toInt(), 1);
+			u"TAKEOUT_INIT_DELAY_"_q.size()).toInt(), 1);
 		const auto now = QDateTime::currentDateTime();
 		const auto when = now.addSecs(seconds);
 		const auto hours = seconds / 3600;
diff --git a/Telegram/SourceFiles/export/view/export_view_settings.cpp b/Telegram/SourceFiles/export/view/export_view_settings.cpp
index 35c6c5e3a..4ff6c0398 100644
--- a/Telegram/SourceFiles/export/view/export_view_settings.cpp
+++ b/Telegram/SourceFiles/export/view/export_view_settings.cpp
@@ -357,9 +357,9 @@ void SettingsWidget::addFormatAndLocationLabel(
 			st::exportLocationLabel),
 		st::exportLocationPadding);
 	label->overrideLinkClickHandler([=](const QString &url) {
-		if (url == qstr("internal:edit_export_path")) {
+		if (url == u"internal:edit_export_path"_q) {
 			chooseFolder();
-		} else if (url == qstr("internal:edit_format")) {
+		} else if (url == u"internal:edit_format"_q) {
 			chooseFormat();
 		} else {
 			Unexpected("Click handler URL in export limits edit.");
@@ -409,7 +409,7 @@ void SettingsWidget::addLimitsLabel(
 			st::exportLocationLabel),
 		st::exportLimitsPadding);
 	label->overrideLinkClickHandler([=](const QString &url) {
-		if (url == qstr("internal:edit_from")) {
+		if (url == u"internal:edit_from"_q) {
 			const auto done = [=](TimeId limit) {
 				changeData([&](Settings &settings) {
 					settings.singlePeerFrom = limit;
@@ -421,7 +421,7 @@ void SettingsWidget::addLimitsLabel(
 				readData().singlePeerTill,
 				tr::lng_export_from_beginning(),
 				done);
-		} else if (url == qstr("internal:edit_till")) {
+		} else if (url == u"internal:edit_till"_q) {
 			const auto done = [=](TimeId limit) {
 				changeData([&](Settings &settings) {
 					settings.singlePeerTill = limit;
diff --git a/Telegram/SourceFiles/ffmpeg/ffmpeg_utility.cpp b/Telegram/SourceFiles/ffmpeg/ffmpeg_utility.cpp
index 091ab66d8..25b973a6f 100644
--- a/Telegram/SourceFiles/ffmpeg/ffmpeg_utility.cpp
+++ b/Telegram/SourceFiles/ffmpeg/ffmpeg_utility.cpp
@@ -96,7 +96,7 @@ void PremultiplyLine(uchar *dst, const uchar *src, int intsCount) {
 		nullptr,
 		0);
 	if (error || !hwDeviceContext) {
-		LogError(qstr("av_hwdevice_ctx_create"), error);
+		LogError(u"av_hwdevice_ctx_create"_q, error);
 		return false;
 	}
 	DEBUG_LOG(("Video Info: "
@@ -195,7 +195,7 @@ IOPointer MakeIOPointer(
 		int64_t(*seek)(void *opaque, int64_t offset, int whence)) {
 	auto buffer = reinterpret_cast<uchar*>(av_malloc(kAvioBlockSize));
 	if (!buffer) {
-		LogError(qstr("av_malloc"));
+		LogError(u"av_malloc"_q);
 		return {};
 	}
 	auto result = IOPointer(avio_alloc_context(
@@ -208,7 +208,7 @@ IOPointer MakeIOPointer(
 		seek));
 	if (!result) {
 		av_freep(&buffer);
-		LogError(qstr("avio_alloc_context"));
+		LogError(u"avio_alloc_context"_q);
 		return {};
 	}
 	return result;
@@ -232,7 +232,7 @@ FormatPointer MakeFormatPointer(
 	}
 	auto result = avformat_alloc_context();
 	if (!result) {
-		LogError(qstr("avformat_alloc_context"));
+		LogError(u"avformat_alloc_context"_q);
 		return {};
 	}
 	result->pb = io.get();
@@ -247,7 +247,7 @@ FormatPointer MakeFormatPointer(
 		&options));
 	if (error) {
 		// avformat_open_input freed 'result' in case an error happened.
-		LogError(qstr("avformat_open_input"), error);
+		LogError(u"avformat_open_input"_q, error);
 		return {};
 	}
 	result->flags |= AVFMT_FLAG_FAST_SEEK;
@@ -277,13 +277,13 @@ CodecPointer MakeCodecPointer(CodecDescriptor descriptor) {
 	auto result = CodecPointer(avcodec_alloc_context3(nullptr));
 	const auto context = result.get();
 	if (!context) {
-		LogError(qstr("avcodec_alloc_context3"));
+		LogError(u"avcodec_alloc_context3"_q);
 		return {};
 	}
 	const auto stream = descriptor.stream;
 	error = avcodec_parameters_to_context(context, stream->codecpar);
 	if (error) {
-		LogError(qstr("avcodec_parameters_to_context"), error);
+		LogError(u"avcodec_parameters_to_context"_q, error);
 		return {};
 	}
 	context->pkt_timebase = stream->time_base;
@@ -292,7 +292,7 @@ CodecPointer MakeCodecPointer(CodecDescriptor descriptor) {
 
 	const auto codec = FindDecoder(context);
 	if (!codec) {
-		LogError(qstr("avcodec_find_decoder"), context->codec_id);
+		LogError(u"avcodec_find_decoder"_q, context->codec_id);
 		return {};
 	}
 
@@ -305,7 +305,7 @@ CodecPointer MakeCodecPointer(CodecDescriptor descriptor) {
 	}
 
 	if ((error = avcodec_open2(context, codec, nullptr))) {
-		LogError(qstr("avcodec_open2"), error);
+		LogError(u"avcodec_open2"_q, error);
 		return {};
 	}
 	return result;
@@ -356,7 +356,7 @@ SwscalePointer MakeSwscalePointer(
 		}
 	}
 	if (srcFormat <= AV_PIX_FMT_NONE || srcFormat >= AV_PIX_FMT_NB) {
-		LogError(qstr("frame->format"));
+		LogError(u"frame->format"_q);
 		return SwscalePointer();
 	}
 
@@ -373,7 +373,7 @@ SwscalePointer MakeSwscalePointer(
 		nullptr,
 		nullptr);
 	if (!result) {
-		LogError(qstr("sws_getCachedContext"));
+		LogError(u"sws_getCachedContext"_q);
 	}
 	return SwscalePointer(
 		result,
@@ -398,11 +398,11 @@ void SwscaleDeleter::operator()(SwsContext *value) {
 	}
 }
 
-void LogError(QLatin1String method) {
+void LogError(const QString &method) {
 	LOG(("Streaming Error: Error in %1.").arg(method));
 }
 
-void LogError(QLatin1String method, AvErrorWrap error) {
+void LogError(const QString &method, AvErrorWrap error) {
 	LOG(("Streaming Error: Error in %1 (code: %2, text: %3)."
 		).arg(method
 		).arg(error.code()
diff --git a/Telegram/SourceFiles/ffmpeg/ffmpeg_utility.h b/Telegram/SourceFiles/ffmpeg/ffmpeg_utility.h
index dd2f359aa..6e5e2ad50 100644
--- a/Telegram/SourceFiles/ffmpeg/ffmpeg_utility.h
+++ b/Telegram/SourceFiles/ffmpeg/ffmpeg_utility.h
@@ -160,8 +160,8 @@ using SwscalePointer = std::unique_ptr<SwsContext, SwscaleDeleter>;
 	QSize resize,
 	SwscalePointer *existing = nullptr);
 
-void LogError(QLatin1String method);
-void LogError(QLatin1String method, FFmpeg::AvErrorWrap error);
+void LogError(const QString &method);
+void LogError(const QString &method, FFmpeg::AvErrorWrap error);
 
 [[nodiscard]] const AVCodec *FindDecoder(not_null<AVCodecContext*> context);
 [[nodiscard]] crl::time PtsToTime(int64_t pts, AVRational timeBase);
diff --git a/Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp b/Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp
index f54836a6a..e88bf30b4 100644
--- a/Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp
+++ b/Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp
@@ -530,7 +530,7 @@ void InnerWidget::updateEmptyText() {
 		: _channel->isMegagroup()
 		? tr::lng_admin_log_no_events_text(tr::now)
 		: tr::lng_admin_log_no_events_text_channel(tr::now);
-	text.text.append(qstr("\n\n") + description);
+	text.text.append(u"\n\n"_q + description);
 	_emptyText.setMarkedText(st::defaultTextStyle, text);
 }
 
diff --git a/Telegram/SourceFiles/history/admin_log/history_admin_log_item.cpp b/Telegram/SourceFiles/history/admin_log/history_admin_log_item.cpp
index b0d550729..d4224034f 100644
--- a/Telegram/SourceFiles/history/admin_log/history_admin_log_item.cpp
+++ b/Telegram/SourceFiles/history/admin_log/history_admin_log_item.cpp
@@ -336,13 +336,13 @@ QString InternalInviteLinkUrl(const MTPExportedChatInvite &data) {
 QString GenerateInviteLinkText(const MTPExportedChatInvite &data) {
 	const auto label = ExtractInviteLinkLabel(data);
 	return label.isEmpty() ? ExtractInviteLink(data).replace(
-		qstr("https://"),
+		u"https://"_q,
 		QString()
 	).replace(
-		qstr("t.me/+"),
+		u"t.me/+"_q,
 		QString()
 	).replace(
-		qstr("t.me/joinchat/"),
+		u"t.me/joinchat/"_q,
 		QString()
 	) : label;
 }
diff --git a/Telegram/SourceFiles/history/history_inner_widget.cpp b/Telegram/SourceFiles/history/history_inner_widget.cpp
index d3f2f3925..fbc075a27 100644
--- a/Telegram/SourceFiles/history/history_inner_widget.cpp
+++ b/Telegram/SourceFiles/history/history_inner_widget.cpp
@@ -2798,7 +2798,7 @@ TextForMimeData HistoryInner::getSelectedText() const {
 		return texts.front().second.unwrapped;
 	}
 	auto result = TextForMimeData();
-	const auto sep = qstr("\n\n");
+	const auto sep = u"\n\n"_q;
 	result.reserve(fullSize + (texts.size() - 1) * sep.size());
 	for (auto i = texts.begin(), e = texts.end(); i != e;) {
 		result.append(i->second.name).append(i->second.time);
diff --git a/Telegram/SourceFiles/history/history_item_text.cpp b/Telegram/SourceFiles/history/history_item_text.cpp
index c994edcee..9bcbee704 100644
--- a/Telegram/SourceFiles/history/history_item_text.cpp
+++ b/Telegram/SourceFiles/history/history_item_text.cpp
@@ -44,7 +44,7 @@ TextForMimeData HistoryItemText(not_null<HistoryItem*> item) {
 	if (result.empty()) {
 		result = std::move(logEntryOriginalResult);
 	} else if (!logEntryOriginalResult.empty()) {
-		result.append(qstr("\n\n")).append(std::move(logEntryOriginalResult));
+		result.append(u"\n\n"_q).append(std::move(logEntryOriginalResult));
 	}
 	return result;
 }
@@ -72,7 +72,7 @@ TextForMimeData HistoryGroupText(not_null<const Data::Group*> group) {
 				if (result.empty()) {
 					result = HistoryItemText(item);
 				} else {
-					result.append(qstr("\n\n")).append(HistoryItemText(item));
+					result.append(u"\n\n"_q).append(HistoryItemText(item));
 				}
 			}
 			return result;
diff --git a/Telegram/SourceFiles/history/history_message.cpp b/Telegram/SourceFiles/history/history_message.cpp
index 9a32deecf..44b0df858 100644
--- a/Telegram/SourceFiles/history/history_message.cpp
+++ b/Telegram/SourceFiles/history/history_message.cpp
@@ -120,7 +120,7 @@ QString GetErrorTextForSending(
 		for (const auto &item : *request.forward) {
 			if (const auto media = item->media()) {
 				const auto error = media->errorTextForForward(peer);
-				if (!error.isEmpty() && error != qstr("skip")) {
+				if (!error.isEmpty() && error != u"skip"_q) {
 					return error;
 				}
 			}
diff --git a/Telegram/SourceFiles/history/history_service.cpp b/Telegram/SourceFiles/history/history_service.cpp
index 37b2024bc..5ccde9939 100644
--- a/Telegram/SourceFiles/history/history_service.cpp
+++ b/Telegram/SourceFiles/history/history_service.cpp
@@ -329,7 +329,7 @@ void HistoryService::setMessageByAction(const MTPmessageAction &action) {
 		result.text = tr::lng_action_bot_allowed_from_domain(
 			tr::now,
 			lt_domain,
-			Ui::Text::Link(domain, qstr("http://") + domain),
+			Ui::Text::Link(domain, u"http://"_q + domain),
 			Ui::Text::WithEntities);
 		return result;
 	};
diff --git a/Telegram/SourceFiles/history/history_widget.cpp b/Telegram/SourceFiles/history/history_widget.cpp
index 6382480c7..15f5ffead 100644
--- a/Telegram/SourceFiles/history/history_widget.cpp
+++ b/Telegram/SourceFiles/history/history_widget.cpp
@@ -2986,13 +2986,13 @@ void HistoryWidget::closeCurrent() {
 }
 
 void HistoryWidget::messagesFailed(const MTP::Error &error, int requestId) {
-	if (error.type() == qstr("CHANNEL_PRIVATE")
+	if (error.type() == u"CHANNEL_PRIVATE"_q
 		&& _peer->isChannel()
 		&& _peer->asChannel()->invitePeekExpires()) {
 		_peer->asChannel()->privateErrorReceived();
-	} else if (error.type() == qstr("CHANNEL_PRIVATE")
-		|| error.type() == qstr("CHANNEL_PUBLIC_GROUP_NA")
-		|| error.type() == qstr("USER_BANNED_IN_CHANNEL")) {
+	} else if (error.type() == u"CHANNEL_PRIVATE"_q
+		|| error.type() == u"CHANNEL_PUBLIC_GROUP_NA"_q
+		|| error.type() == u"USER_BANNED_IN_CHANNEL"_q) {
 		auto was = _peer;
 		closeCurrent();
 		if (const auto primary = Core::App().primaryWindow()) {
diff --git a/Telegram/SourceFiles/history/view/history_view_list_widget.cpp b/Telegram/SourceFiles/history/view/history_view_list_widget.cpp
index e5afa5890..1b8c892e7 100644
--- a/Telegram/SourceFiles/history/view/history_view_list_widget.cpp
+++ b/Telegram/SourceFiles/history/view/history_view_list_widget.cpp
@@ -2339,7 +2339,7 @@ TextForMimeData ListWidget::getSelectedText() const {
 	});
 
 	auto result = TextForMimeData();
-	auto sep = qstr("\n\n");
+	auto sep = u"\n\n"_q;
 	result.reserve(fullSize + (texts.size() - 1) * sep.size());
 	for (auto i = begin(texts), e = end(texts); i != e;) {
 		result.append(std::move(i->second));
diff --git a/Telegram/SourceFiles/history/view/history_view_message.cpp b/Telegram/SourceFiles/history/view/history_view_message.cpp
index 4b5bf0038..a822c5067 100644
--- a/Telegram/SourceFiles/history/view/history_view_message.cpp
+++ b/Telegram/SourceFiles/history/view/history_view_message.cpp
@@ -2127,12 +2127,12 @@ TextForMimeData Message::selectedText(TextSelection selection) const {
 	if (result.empty()) {
 		result = std::move(mediaResult);
 	} else if (!mediaResult.empty()) {
-		result.append(qstr("\n\n")).append(std::move(mediaResult));
+		result.append(u"\n\n"_q).append(std::move(mediaResult));
 	}
 	if (result.empty()) {
 		result = std::move(logEntryOriginalResult);
 	} else if (!logEntryOriginalResult.empty()) {
-		result.append(qstr("\n\n")).append(std::move(logEntryOriginalResult));
+		result.append(u"\n\n"_q).append(std::move(logEntryOriginalResult));
 	}
 	return result;
 }
diff --git a/Telegram/SourceFiles/history/view/media/history_view_media.cpp b/Telegram/SourceFiles/history/view/media/history_view_media.cpp
index 166461afe..7ee2c2d51 100644
--- a/Telegram/SourceFiles/history/view/media/history_view_media.cpp
+++ b/Telegram/SourceFiles/history/view/media/history_view_media.cpp
@@ -71,7 +71,7 @@ TimeId DurationForTimestampLinks(not_null<WebPageData*> webpage) {
 	} else if (const auto document = webpage->document) {
 		return DurationForTimestampLinks(document);
 	} else if (webpage->type != WebPageType::Video
-		|| webpage->siteName != qstr("YouTube")) {
+		|| webpage->siteName != u"YouTube"_q) {
 		return TimeId(0);
 	} else if (webpage->duration > 0) {
 		return webpage->duration;
diff --git a/Telegram/SourceFiles/history/view/media/history_view_media_grouped.cpp b/Telegram/SourceFiles/history/view/media/history_view_media_grouped.cpp
index 6bac66bcf..79bf5304c 100644
--- a/Telegram/SourceFiles/history/view/media/history_view_media_grouped.cpp
+++ b/Telegram/SourceFiles/history/view/media/history_view_media_grouped.cpp
@@ -547,7 +547,7 @@ TextForMimeData GroupedMedia::selectedText(
 			if (result.empty()) {
 				result = std::move(text);
 			} else {
-				result.append(qstr("\n\n")).append(std::move(text));
+				result.append(u"\n\n"_q).append(std::move(text));
 			}
 		}
 		selection = part.content->skipSelection(selection);
diff --git a/Telegram/SourceFiles/history/view/media/history_view_web_page.cpp b/Telegram/SourceFiles/history/view/media/history_view_web_page.cpp
index 08bd8aec4..d66e00c1c 100644
--- a/Telegram/SourceFiles/history/view/media/history_view_web_page.cpp
+++ b/Telegram/SourceFiles/history/view/media/history_view_web_page.cpp
@@ -116,7 +116,7 @@ QSize WebPage::countOptimalSize() {
 				if (result.endsWith('/')) {
 					result.chop(1);
 				}
-				const auto prefixes = { qstr("http://"), qstr("https://") };
+				const auto prefixes = { u"http://"_q, u"https://"_q };
 				for (const auto &prefix : prefixes) {
 					if (result.startsWith(prefix)) {
 						result = result.mid(prefix.size());
@@ -166,8 +166,8 @@ QSize WebPage::countOptimalSize() {
 		&& _data->type != WebPageType::Video) {
 		if (_data->type == WebPageType::Profile) {
 			_asArticle = true;
-		} else if (_data->siteName == qstr("Twitter")
-			|| _data->siteName == qstr("Facebook")
+		} else if (_data->siteName == u"Twitter"_q
+			|| _data->siteName == u"Facebook"_q
 			|| _data->type == WebPageType::ArticleWithIV) {
 			_asArticle = false;
 		} else {
@@ -216,9 +216,9 @@ QSize WebPage::countOptimalSize() {
 			.session = &history()->session(),
 			.customEmojiRepaint = [=] { _parent->customEmojiRepaint(); },
 		};
-		if (_data->siteName == qstr("Twitter")) {
+		if (_data->siteName == u"Twitter"_q) {
 			context.type = MarkedTextContext::HashtagMentionType::Twitter;
-		} else if (_data->siteName == qstr("Instagram")) {
+		} else if (_data->siteName == u"Instagram"_q) {
 			context.type = MarkedTextContext::HashtagMentionType::Instagram;
 		}
 		_description.setMarkedText(
@@ -607,7 +607,7 @@ void WebPage::draw(Painter &p, const PaintContext &context) const {
 			&& _data->photo
 			&& !_data->document) {
 			if (_attach->isReadyForOpen()) {
-				if (_data->siteName == qstr("YouTube")) {
+				if (_data->siteName == u"YouTube"_q) {
 					st->youtubeIcon().paint(p, (pixwidth - st::youtubeIcon.width()) / 2, (pixheight - st::youtubeIcon.height()) / 2, width());
 				} else {
 					st->videoIcon().paint(p, (pixwidth - st::videoIcon.width()) / 2, (pixheight - st::videoIcon.height()) / 2, width());
@@ -752,8 +752,8 @@ ClickHandlerPtr WebPage::replaceAttachLink(
 			|| _data->type == WebPageType::Video) {
 			return _openl;
 		} else if (_data->type == WebPageType::Photo
-			|| _data->siteName == qstr("Twitter")
-			|| _data->siteName == qstr("Facebook")) {
+			|| _data->siteName == u"Twitter"_q
+			|| _data->siteName == u"Facebook"_q) {
 			// leave photo link
 		} else {
 			return _openl;
diff --git a/Telegram/SourceFiles/info/profile/info_profile_actions.cpp b/Telegram/SourceFiles/info/profile/info_profile_actions.cpp
index a95a541cb..1c4b278e6 100644
--- a/Telegram/SourceFiles/info/profile/info_profile_actions.cpp
+++ b/Telegram/SourceFiles/info/profile/info_profile_actions.cpp
@@ -458,8 +458,8 @@ object_ptr<Ui::RpWidget> DetailsFiller::setupInfo() {
 			return link.isEmpty()
 				? TextWithEntities()
 				: Ui::Text::Link(
-					(link.startsWith(qstr("https://"))
-						? link.mid(qstr("https://").size())
+					(link.startsWith(u"https://"_q)
+						? link.mid(u"https://"_q.size())
 						: link) + addToLink,
 					link + addToLink);
 		});
diff --git a/Telegram/SourceFiles/inline_bots/bot_attach_web_view.cpp b/Telegram/SourceFiles/inline_bots/bot_attach_web_view.cpp
index 93defc1be..fc2f1c315 100644
--- a/Telegram/SourceFiles/inline_bots/bot_attach_web_view.cpp
+++ b/Telegram/SourceFiles/inline_bots/bot_attach_web_view.cpp
@@ -816,8 +816,8 @@ void AttachWebView::show(
 	const auto handleLocalUri = [close](QString uri) {
 		const auto local = Core::TryConvertUrlToLocal(uri);
 		if (uri == local || Core::InternalPassportLink(local)) {
-			return local.startsWith(qstr("tg://"));
-		} else if (!local.startsWith(qstr("tg://"), Qt::CaseInsensitive)) {
+			return local.startsWith(u"tg://"_q);
+		} else if (!local.startsWith(u"tg://"_q, Qt::CaseInsensitive)) {
 			return false;
 		}
 		UrlClickHandler::Open(local, {});
diff --git a/Telegram/SourceFiles/inline_bots/inline_bot_result.cpp b/Telegram/SourceFiles/inline_bots/inline_bot_result.cpp
index fa527a709..fbcd41df2 100644
--- a/Telegram/SourceFiles/inline_bots/inline_bot_result.cpp
+++ b/Telegram/SourceFiles/inline_bots/inline_bot_result.cpp
@@ -474,7 +474,7 @@ MTPVector<MTPDocumentAttribute> Result::adjustAttributes(
 	const auto mime = qs(mimeType);
 	if (_type == Type::Gif) {
 		if (!exists(mtpc_documentAttributeFilename)) {
-			auto filename = (mime == qstr("video/mp4")
+			auto filename = (mime == u"video/mp4"_q
 				? "animation.gif.mp4"
 				: "animation.gif");
 			result.push_back(MTP_documentAttributeFilename(
@@ -487,7 +487,7 @@ MTPVector<MTPDocumentAttribute> Result::adjustAttributes(
 		const auto audio = find(mtpc_documentAttributeAudio);
 		if (audio != result.cend()) {
 			using Flag = MTPDdocumentAttributeAudio::Flag;
-			if (mime == qstr("audio/ogg")) {
+			if (mime == u"audio/ogg"_q) {
 				// We always treat audio/ogg as a voice message.
 				// It was that way before we started to get attributes here.
 				const auto &fields = audio->c_documentAttributeAudio();
diff --git a/Telegram/SourceFiles/intro/intro_code.cpp b/Telegram/SourceFiles/intro/intro_code.cpp
index b09292934..00cb0f93c 100644
--- a/Telegram/SourceFiles/intro/intro_code.cpp
+++ b/Telegram/SourceFiles/intro/intro_code.cpp
@@ -277,13 +277,13 @@ void CodeWidget::codeSubmitFail(const MTP::Error &error) {
 	stopCheck();
 	_sentRequest = 0;
 	auto &err = error.type();
-	if (err == qstr("PHONE_NUMBER_INVALID")
-		|| err == qstr("PHONE_CODE_EXPIRED")
-		|| err == qstr("PHONE_NUMBER_BANNED")) { // show error
+	if (err == u"PHONE_NUMBER_INVALID"_q
+		|| err == u"PHONE_CODE_EXPIRED"_q
+		|| err == u"PHONE_NUMBER_BANNED"_q) { // show error
 		goBack();
-	} else if (err == qstr("PHONE_CODE_EMPTY") || err == qstr("PHONE_CODE_INVALID")) {
+	} else if (err == u"PHONE_CODE_EMPTY"_q || err == u"PHONE_CODE_INVALID"_q) {
 		showCodeError(tr::lng_bad_code());
-	} else if (err == qstr("SESSION_PASSWORD_NEEDED")) {
+	} else if (err == u"SESSION_PASSWORD_NEEDED"_q) {
 		_checkRequestTimer.callEach(1000);
 		_sentRequest = api().request(MTPaccount_GetPassword(
 		)).done([=](const MTPaccount_Password &result) {
diff --git a/Telegram/SourceFiles/intro/intro_password_check.cpp b/Telegram/SourceFiles/intro/intro_password_check.cpp
index 9e95dbb8c..9bd9e2877 100644
--- a/Telegram/SourceFiles/intro/intro_password_check.cpp
+++ b/Telegram/SourceFiles/intro/intro_password_check.cpp
@@ -145,15 +145,15 @@ void PasswordCheckWidget::pwdSubmitFail(const MTP::Error &error) {
 
 	_sentRequest = 0;
 	const auto &type = error.type();
-	if (type == qstr("PASSWORD_HASH_INVALID")
-		|| type == qstr("SRP_PASSWORD_CHANGED")) {
+	if (type == u"PASSWORD_HASH_INVALID"_q
+		|| type == u"SRP_PASSWORD_CHANGED"_q) {
 		showError(tr::lng_signin_bad_password());
 		_pwdField->selectAll();
 		_pwdField->showError();
-	} else if (type == qstr("PASSWORD_EMPTY")
-		|| type == qstr("AUTH_KEY_UNREGISTERED")) {
+	} else if (type == u"PASSWORD_EMPTY"_q
+		|| type == u"AUTH_KEY_UNREGISTERED"_q) {
 		goBack();
-	} else if (type == qstr("SRP_ID_INVALID")) {
+	} else if (type == u"SRP_ID_INVALID"_q) {
 		handleSrpIdInvalid();
 	} else {
 		if (Logs::DebugEnabled()) { // internal server error
@@ -251,15 +251,15 @@ void PasswordCheckWidget::codeSubmitFail(const MTP::Error &error) {
 
 	_sentRequest = 0;
 	const auto &type = error.type();
-	if (type == qstr("PASSWORD_EMPTY")
-		|| type == qstr("AUTH_KEY_UNREGISTERED")) {
+	if (type == u"PASSWORD_EMPTY"_q
+		|| type == u"AUTH_KEY_UNREGISTERED"_q) {
 		goBack();
-	} else if (type == qstr("PASSWORD_RECOVERY_NA")) {
+	} else if (type == u"PASSWORD_RECOVERY_NA"_q) {
 		recoverStartFail(error);
-	} else if (type == qstr("PASSWORD_RECOVERY_EXPIRED")) {
+	} else if (type == u"PASSWORD_RECOVERY_EXPIRED"_q) {
 		_emailPattern = QString();
 		toPassword();
-	} else if (type == qstr("CODE_INVALID")) {
+	} else if (type == u"CODE_INVALID"_q) {
 		showError(tr::lng_signin_wrong_code());
 		_codeField->selectAll();
 		_codeField->showError();
diff --git a/Telegram/SourceFiles/intro/intro_phone.cpp b/Telegram/SourceFiles/intro/intro_phone.cpp
index 53dee06f3..137312bca 100644
--- a/Telegram/SourceFiles/intro/intro_phone.cpp
+++ b/Telegram/SourceFiles/intro/intro_phone.cpp
@@ -243,11 +243,11 @@ void PhoneWidget::phoneSubmitFail(const MTP::Error &error) {
 	stopCheck();
 	_sentRequest = 0;
 	auto &err = error.type();
-	if (err == qstr("PHONE_NUMBER_FLOOD")) {
+	if (err == u"PHONE_NUMBER_FLOOD"_q) {
 		Ui::show(Ui::MakeInformBox(tr::lng_error_phone_flood()));
-	} else if (err == qstr("PHONE_NUMBER_INVALID")) { // show error
+	} else if (err == u"PHONE_NUMBER_INVALID"_q) { // show error
 		showPhoneError(tr::lng_bad_phone());
-	} else if (err == qstr("PHONE_NUMBER_BANNED")) {
+	} else if (err == u"PHONE_NUMBER_BANNED"_q) {
 		Ui::ShowPhoneBannedError(getData()->controller, _sentPhone);
 	} else if (Logs::DebugEnabled()) { // internal server error
 		showPhoneError(rpl::single(err + ": " + error.description()));
diff --git a/Telegram/SourceFiles/intro/intro_qr.cpp b/Telegram/SourceFiles/intro/intro_qr.cpp
index cee175755..1d22015aa 100644
--- a/Telegram/SourceFiles/intro/intro_qr.cpp
+++ b/Telegram/SourceFiles/intro/intro_qr.cpp
@@ -347,7 +347,7 @@ void QrWidget::handleTokenResult(const MTPauth_LoginToken &result) {
 
 void QrWidget::showTokenError(const MTP::Error &error) {
 	_requestId = 0;
-	if (error.type() == qstr("SESSION_PASSWORD_NEEDED")) {
+	if (error.type() == u"SESSION_PASSWORD_NEEDED"_q) {
 		sendCheckPasswordRequest();
 	} else if (base::take(_forceRefresh)) {
 		refreshCode();
diff --git a/Telegram/SourceFiles/intro/intro_signup.cpp b/Telegram/SourceFiles/intro/intro_signup.cpp
index 1609fdfa3..8fe819d03 100644
--- a/Telegram/SourceFiles/intro/intro_signup.cpp
+++ b/Telegram/SourceFiles/intro/intro_signup.cpp
@@ -129,14 +129,14 @@ void SignupWidget::nameSubmitFail(const MTP::Error &error) {
 	}
 
 	auto &err = error.type();
-	if (err == qstr("PHONE_NUMBER_FLOOD")) {
+	if (err == u"PHONE_NUMBER_FLOOD"_q) {
 		Ui::show(Ui::MakeInformBox(tr::lng_error_phone_flood()));
-	} else if (err == qstr("PHONE_NUMBER_INVALID")
-		|| err == qstr("PHONE_NUMBER_BANNED")
-		|| err == qstr("PHONE_CODE_EXPIRED")
-		|| err == qstr("PHONE_CODE_EMPTY")
-		|| err == qstr("PHONE_CODE_INVALID")
-		|| err == qstr("PHONE_NUMBER_OCCUPIED")) {
+	} else if (err == u"PHONE_NUMBER_INVALID"_q
+		|| err == u"PHONE_NUMBER_BANNED"_q
+		|| err == u"PHONE_CODE_EXPIRED"_q
+		|| err == u"PHONE_CODE_EMPTY"_q
+		|| err == u"PHONE_CODE_INVALID"_q
+		|| err == u"PHONE_NUMBER_OCCUPIED"_q) {
 		goBack();
 	} else if (err == "FIRSTNAME_INVALID") {
 		showError(tr::lng_bad_name());
diff --git a/Telegram/SourceFiles/intro/intro_widget.cpp b/Telegram/SourceFiles/intro/intro_widget.cpp
index 59a620254..a4a95550a 100644
--- a/Telegram/SourceFiles/intro/intro_widget.cpp
+++ b/Telegram/SourceFiles/intro/intro_widget.cpp
@@ -509,10 +509,10 @@ void Widget::resetAccount() {
 			_resetRequest = 0;
 
 			const auto &type = error.type();
-			if (type.startsWith(qstr("2FA_CONFIRM_WAIT_"))) {
+			if (type.startsWith(u"2FA_CONFIRM_WAIT_"_q)) {
 				const auto seconds = base::StringViewMid(
 					type,
-					qstr("2FA_CONFIRM_WAIT_").size()).toInt();
+					u"2FA_CONFIRM_WAIT_"_q.size()).toInt();
 				const auto days = (seconds + 59) / 86400;
 				const auto hours = ((seconds + 59) % 86400) / 3600;
 				const auto minutes = ((seconds + 59) % 3600) / 60;
@@ -552,7 +552,7 @@ void Widget::resetAccount() {
 					Ui::FormatPhone(getData()->phone),
 					lt_when,
 					when)));
-			} else if (type == qstr("2FA_RECENT_CONFIRM")) {
+			} else if (type == u"2FA_RECENT_CONFIRM"_q) {
 				Ui::show(Ui::MakeInformBox(
 					tr::lng_signin_reset_cancelled()));
 			} else {
diff --git a/Telegram/SourceFiles/lang/lang_cloud_manager.cpp b/Telegram/SourceFiles/lang/lang_cloud_manager.cpp
index c64945a47..1b4623db2 100644
--- a/Telegram/SourceFiles/lang/lang_cloud_manager.cpp
+++ b/Telegram/SourceFiles/lang/lang_cloud_manager.cpp
@@ -396,7 +396,7 @@ void CloudManager::applyLangPackData(
 }
 
 bool CloudManager::canApplyWithoutRestart(const QString &id) const {
-	if (id == qstr("#TEST_X") || id == qstr("#TEST_0")) {
+	if (id == u"#TEST_X"_q || id == u"#TEST_0"_q) {
 		return true;
 	}
 	return Core::App().canApplyLangPackWithoutRestart();
@@ -422,7 +422,7 @@ void CloudManager::requestLanguageAndSwitch(
 	if (LanguageIdOrDefault(_langpack.id()) == id) {
 		Ui::show(Ui::MakeInformBox(tr::lng_language_already()));
 		return;
-	} else if (id == qstr("#custom")) {
+	} else if (id == u"#custom"_q) {
 		performSwitchToCustom();
 		return;
 	}
@@ -471,14 +471,14 @@ void CloudManager::sendSwitchingToLanguageRequest() {
 }
 
 void CloudManager::switchToLanguage(const Language &data) {
-	if (_langpack.id() == data.id && data.id != qstr("#custom")) {
+	if (_langpack.id() == data.id && data.id != u"#custom"_q) {
 		return;
 	} else if (!_api) {
 		return;
 	}
 
 	_api->request(base::take(_getKeysForSwitchRequestId)).cancel();
-	if (data.id == qstr("#custom")) {
+	if (data.id == u"#custom"_q) {
 		performSwitchToCustom();
 	} else if (canApplyWithoutRestart(data.id)) {
 		performSwitchAndAddToRecent(data);
@@ -516,8 +516,8 @@ void CloudManager::switchToLanguage(const Language &data) {
 }
 
 void CloudManager::performSwitchToCustom() {
-	auto filter = qsl("Language files (*.strings)");
-	auto title = qsl("Choose language .strings file");
+	auto filter = u"Language files (*.strings)"_q;
+	auto title = u"Choose language .strings file"_q;
 	FileDialog::GetOpenPath(Core::App().getFileDialogParent(), title, filter, [=, weak = base::make_weak(this)](const FileDialog::OpenResult &result) {
 		if (!weak || result.paths.isEmpty()) {
 			return;
@@ -533,7 +533,7 @@ void CloudManager::performSwitchToCustom() {
 					base::take(_switchingToLanguageRequest)
 				).cancel();
 			}
-			if (canApplyWithoutRestart(qsl("#custom"))) {
+			if (canApplyWithoutRestart(u"#custom"_q)) {
 				_langpack.switchToCustomFile(filePath);
 			} else {
 				const auto values = loader.found();
@@ -568,9 +568,9 @@ void CloudManager::performSwitchToCustom() {
 }
 
 void CloudManager::switchToTestLanguage() {
-	const auto testLanguageId = (_langpack.id() == qstr("#TEST_X"))
-		? qsl("#TEST_0")
-		: qsl("#TEST_X");
+	const auto testLanguageId = (_langpack.id() == u"#TEST_X"_q)
+		? u"#TEST_0"_q
+		: u"#TEST_X"_q;
 	performSwitch({ testLanguageId });
 }
 
diff --git a/Telegram/SourceFiles/lang/lang_instance.cpp b/Telegram/SourceFiles/lang/lang_instance.cpp
index 2f328ac8b..e84036060 100644
--- a/Telegram/SourceFiles/lang/lang_instance.cpp
+++ b/Telegram/SourceFiles/lang/lang_instance.cpp
@@ -254,7 +254,7 @@ Instance::Instance(not_null<Instance*> derived, const PrivateTag &)
 
 void Instance::switchToId(const Language &data) {
 	reset(data);
-	if (_id == qstr("#TEST_X") || _id == qstr("#TEST_0")) {
+	if (_id == u"#TEST_X"_q || _id == u"#TEST_0"_q) {
 		for (auto &value : _values) {
 			value = PrepareTestValue(value, _id[5]);
 		}
@@ -365,8 +365,8 @@ QString Instance::id(Pack pack) const {
 
 bool Instance::isCustom() const {
 	return (_id == CustomLanguageId())
-		|| (_id == qstr("#TEST_X"))
-		|| (_id == qstr("#TEST_0"));
+		|| (_id == u"#TEST_X"_q)
+		|| (_id == u"#TEST_0"_q);
 }
 
 int Instance::version(Pack pack) const {
diff --git a/Telegram/SourceFiles/lang/lang_translator.cpp b/Telegram/SourceFiles/lang/lang_translator.cpp
index 90918947e..eeb125101 100644
--- a/Telegram/SourceFiles/lang/lang_translator.cpp
+++ b/Telegram/SourceFiles/lang/lang_translator.cpp
@@ -13,28 +13,28 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 namespace Lang {
 
 QString Translator::translate(const char *context, const char *sourceText, const char *disambiguation, int n) const {
-	if (qstr("QMenuBar") == context) {
-		if (qstr("Services") == sourceText) return tr::lng_mac_menu_services(tr::now);
-		if (qstr("Hide %1") == sourceText) return tr::lng_mac_menu_hide_telegram(tr::now, lt_telegram, qsl("%1"));
-		if (qstr("Hide Others") == sourceText) return tr::lng_mac_menu_hide_others(tr::now);
-		if (qstr("Show All") == sourceText) return tr::lng_mac_menu_show_all(tr::now);
-		if (qstr("Preferences...") == sourceText) return tr::lng_mac_menu_preferences(tr::now);
-		if (qstr("Quit %1") == sourceText) return tr::lng_mac_menu_quit_telegram(tr::now, lt_telegram, qsl("%1"));
-		if (qstr("About %1") == sourceText) return tr::lng_mac_menu_about_telegram(tr::now, lt_telegram, qsl("%1"));
+	if (u"QMenuBar"_q == context) {
+		if (u"Services"_q == sourceText) return tr::lng_mac_menu_services(tr::now);
+		if (u"Hide %1"_q == sourceText) return tr::lng_mac_menu_hide_telegram(tr::now, lt_telegram, u"%1"_q);
+		if (u"Hide Others"_q == sourceText) return tr::lng_mac_menu_hide_others(tr::now);
+		if (u"Show All"_q == sourceText) return tr::lng_mac_menu_show_all(tr::now);
+		if (u"Preferences..."_q == sourceText) return tr::lng_mac_menu_preferences(tr::now);
+		if (u"Quit %1"_q == sourceText) return tr::lng_mac_menu_quit_telegram(tr::now, lt_telegram, u"%1"_q);
+		if (u"About %1"_q == sourceText) return tr::lng_mac_menu_about_telegram(tr::now, lt_telegram, u"%1"_q);
 		return QString();
 	}
-	if (qstr("QWidgetTextControl") == context || qstr("QLineEdit") == context) {
-		if (qstr("&Undo") == sourceText) return Platform::IsWindows() ? tr::lng_wnd_menu_undo(tr::now) : Platform::IsMac() ? tr::lng_mac_menu_undo(tr::now) : tr::lng_linux_menu_undo(tr::now);
-		if (qstr("&Redo") == sourceText) return Platform::IsWindows() ? tr::lng_wnd_menu_redo(tr::now) : Platform::IsMac() ? tr::lng_mac_menu_redo(tr::now) : tr::lng_linux_menu_redo(tr::now);
-		if (qstr("Cu&t") == sourceText) return tr::lng_mac_menu_cut(tr::now);
-		if (qstr("&Copy") == sourceText) return tr::lng_mac_menu_copy(tr::now);
-		if (qstr("&Paste") == sourceText) return tr::lng_mac_menu_paste(tr::now);
-		if (qstr("Delete") == sourceText) return tr::lng_mac_menu_delete(tr::now);
-		if (qstr("Select All") == sourceText) return tr::lng_mac_menu_select_all(tr::now);
+	if (u"QWidgetTextControl"_q == context || u"QLineEdit"_q == context) {
+		if (u"&Undo"_q == sourceText) return Platform::IsWindows() ? tr::lng_wnd_menu_undo(tr::now) : Platform::IsMac() ? tr::lng_mac_menu_undo(tr::now) : tr::lng_linux_menu_undo(tr::now);
+		if (u"&Redo"_q == sourceText) return Platform::IsWindows() ? tr::lng_wnd_menu_redo(tr::now) : Platform::IsMac() ? tr::lng_mac_menu_redo(tr::now) : tr::lng_linux_menu_redo(tr::now);
+		if (u"Cu&t"_q == sourceText) return tr::lng_mac_menu_cut(tr::now);
+		if (u"&Copy"_q == sourceText) return tr::lng_mac_menu_copy(tr::now);
+		if (u"&Paste"_q == sourceText) return tr::lng_mac_menu_paste(tr::now);
+		if (u"Delete"_q == sourceText) return tr::lng_mac_menu_delete(tr::now);
+		if (u"Select All"_q == sourceText) return tr::lng_mac_menu_select_all(tr::now);
 		return QString();
 	}
-	if (qstr("QUnicodeControlCharacterMenu") == context) {
-		if (qstr("Insert Unicode control character") == sourceText) return tr::lng_menu_insert_unicode(tr::now);
+	if (u"QUnicodeControlCharacterMenu"_q == context) {
+		if (u"Insert Unicode control character"_q == sourceText) return tr::lng_menu_insert_unicode(tr::now);
 		return QString();
 	}
 	return QString();
diff --git a/Telegram/SourceFiles/layout/layout_document_generic_preview.cpp b/Telegram/SourceFiles/layout/layout_document_generic_preview.cpp
index 11c961518..d28a5bece 100644
--- a/Telegram/SourceFiles/layout/layout_document_generic_preview.cpp
+++ b/Telegram/SourceFiles/layout/layout_document_generic_preview.cpp
@@ -36,30 +36,30 @@ DocumentGenericPreview DocumentGenericPreview::Create(
 		: tr::lng_message_empty(tr::now)).toLower();
 	auto lastDot = name.lastIndexOf('.');
 	const auto mime = document ? document->mimeString() : QString();
-	if (name.endsWith(qstr(".doc")) ||
-		name.endsWith(qstr(".docx")) ||
-		name.endsWith(qstr(".txt")) ||
-		name.endsWith(qstr(".psd")) ||
-		mime.startsWith(qstr("text/"))) {
+	if (name.endsWith(u".doc"_q) ||
+		name.endsWith(u".docx"_q) ||
+		name.endsWith(u".txt"_q) ||
+		name.endsWith(u".psd"_q) ||
+		mime.startsWith(u"text/"_q)) {
 		colorIndex = 0;
 	} else if (
-		name.endsWith(qstr(".xls")) ||
-		name.endsWith(qstr(".xlsx")) ||
-		name.endsWith(qstr(".csv"))) {
+		name.endsWith(u".xls"_q) ||
+		name.endsWith(u".xlsx"_q) ||
+		name.endsWith(u".csv"_q)) {
 		colorIndex = 1;
 	} else if (
-		name.endsWith(qstr(".pdf")) ||
-		name.endsWith(qstr(".ppt")) ||
-		name.endsWith(qstr(".pptx")) ||
-		name.endsWith(qstr(".key"))) {
+		name.endsWith(u".pdf"_q) ||
+		name.endsWith(u".ppt"_q) ||
+		name.endsWith(u".pptx"_q) ||
+		name.endsWith(u".key"_q)) {
 		colorIndex = 2;
 	} else if (
-		name.endsWith(qstr(".zip")) ||
-		name.endsWith(qstr(".rar")) ||
-		name.endsWith(qstr(".ai")) ||
-		name.endsWith(qstr(".mp3")) ||
-		name.endsWith(qstr(".mov")) ||
-		name.endsWith(qstr(".avi"))) {
+		name.endsWith(u".zip"_q) ||
+		name.endsWith(u".rar"_q) ||
+		name.endsWith(u".ai"_q) ||
+		name.endsWith(u".mp3"_q) ||
+		name.endsWith(u".mov"_q) ||
+		name.endsWith(u".avi"_q)) {
 		colorIndex = 3;
 	} else {
 		auto ch = (lastDot >= 0 && lastDot + 1 < name.size())
diff --git a/Telegram/SourceFiles/logs.cpp b/Telegram/SourceFiles/logs.cpp
index 24497e534..02affba17 100644
--- a/Telegram/SourceFiles/logs.cpp
+++ b/Telegram/SourceFiles/logs.cpp
@@ -52,10 +52,10 @@ QMutex *_logsMutex(LogDataType type, bool clear = false) {
 QString _logsFilePath(LogDataType type, const QString &postfix = QString()) {
 	QString path(cWorkingDir());
 	switch (type) {
-	case LogDataMain: path += qstr("log") + postfix + qstr(".txt"); break;
-	case LogDataDebug: path += qstr("DebugLogs/log") + postfix + qstr(".txt"); break;
-	case LogDataTcp: path += qstr("DebugLogs/tcp") + postfix + qstr(".txt"); break;
-	case LogDataMtp: path += qstr("DebugLogs/mtp") + postfix + qstr(".txt"); break;
+	case LogDataMain: path += u"log"_q + postfix + u".txt"_q; break;
+	case LogDataDebug: path += u"DebugLogs/log"_q + postfix + u".txt"_q; break;
+	case LogDataTcp: path += u"DebugLogs/tcp"_q + postfix + u".txt"_q; break;
+	case LogDataMtp: path += u"DebugLogs/mtp"_q + postfix + u".txt"_q; break;
 	}
 	return path;
 }
@@ -165,8 +165,8 @@ private:
 					QDir working(cWorkingDir()); // delete all other log_startXX.txt that we can
 					QStringList oldlogs = working.entryList(QStringList("log_start*.txt"), QDir::Files);
 					for (QStringList::const_iterator i = oldlogs.cbegin(), e = oldlogs.cend(); i != e; ++i) {
-						QString oldlog = cWorkingDir() + *i, oldlogend = i->mid(qstr("log_start").size());
-						if (oldlogend.size() == 1 + qstr(".txt").size() && oldlogend.at(0).isDigit() && base::StringViewMid(oldlogend, 1) == qstr(".txt")) {
+						QString oldlog = cWorkingDir() + *i, oldlogend = i->mid(u"log_start"_q.size());
+						if (oldlogend.size() == 1 + u".txt"_q.size() && oldlogend.at(0).isDigit() && base::StringViewMid(oldlogend, 1) == u".txt"_q) {
 							bool removed = QFile(oldlog).remove();
 							LOG(("Old start log '%1' found, deleted: %2").arg(*i, Logs::b(removed)));
 						}
@@ -209,7 +209,7 @@ private:
 					files[type]->close();
 				}
 			} else {
-				QDir().mkdir(cWorkingDir() + qstr("DebugLogs"));
+				QDir().mkdir(cWorkingDir() + u"DebugLogs"_q);
 			}
 		}
 		if (files[type]->open(mode)) {
@@ -415,7 +415,7 @@ void start(not_null<Core::Launcher*> launcher) {
 	QDir().setCurrent(cWorkingDir());
 #endif // !Q_OS_WINRT
 
-	QDir().mkpath(cWorkingDir() + qstr("tdata"));
+	QDir().mkpath(cWorkingDir() + u"tdata"_q);
 
 	launcher->workingFolderReady();
 	CrashReports::StartCatching(launcher);
diff --git a/Telegram/SourceFiles/main/main_session.cpp b/Telegram/SourceFiles/main/main_session.cpp
index 4e3acc095..80be9b409 100644
--- a/Telegram/SourceFiles/main/main_session.cpp
+++ b/Telegram/SourceFiles/main/main_session.cpp
@@ -59,8 +59,8 @@ constexpr auto kTmpPasswordReserveTime = TimeId(10);
 	// Like 'https://telegram.me/' or 'https://t.me/'.
 	const auto &domain = session->serverConfig().internalLinksDomain;
 	const auto prefixes = {
-		qstr("https://"),
-		qstr("http://"),
+		u"https://"_q,
+		u"http://"_q,
 	};
 	for (const auto &prefix : prefixes) {
 		if (domain.startsWith(prefix, Qt::CaseInsensitive)) {
@@ -363,8 +363,8 @@ TextWithEntities Session::createInternalLink(
 		const TextWithEntities &query) const {
 	const auto result = createInternalLinkFull(query);
 	const auto prefixes = {
-		qstr("https://"),
-		qstr("http://"),
+		u"https://"_q,
+		u"http://"_q,
 	};
 	for (auto &prefix : prefixes) {
 		if (result.text.startsWith(prefix, Qt::CaseInsensitive)) {
diff --git a/Telegram/SourceFiles/mainwidget.cpp b/Telegram/SourceFiles/mainwidget.cpp
index 5131e21d6..26c2d88a3 100644
--- a/Telegram/SourceFiles/mainwidget.cpp
+++ b/Telegram/SourceFiles/mainwidget.cpp
@@ -2766,7 +2766,7 @@ void MainWidget::activate() {
 	if (_a_show.animating()) {
 		return;
 	} else if (!cSendPaths().isEmpty()) {
-		const auto interpret = qstr("interpret://");
+		const auto interpret = u"interpret://"_q;
 		const auto path = cSendPaths()[0];
 		if (path.startsWith(interpret)) {
 			cSetSendPaths(QStringList());
diff --git a/Telegram/SourceFiles/media/audio/media_audio_capture.cpp b/Telegram/SourceFiles/media/audio/media_audio_capture.cpp
index b1a12dd04..2eff9c98d 100644
--- a/Telegram/SourceFiles/media/audio/media_audio_capture.cpp
+++ b/Telegram/SourceFiles/media/audio/media_audio_capture.cpp
@@ -266,7 +266,7 @@ void Instance::Inner::start(Fn<void(Update)> updated, Fn<void()> error) {
 	const AVOutputFormat *fmt = nullptr;
 	void *i = nullptr;
 	while ((fmt = av_muxer_iterate(&i))) {
-		if (fmt->name == qstr("opus")) {
+		if (fmt->name == u"opus"_q) {
 			break;
 		}
 	}
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_utility.cpp b/Telegram/SourceFiles/media/streaming/media_streaming_utility.cpp
index cb31ee6b0..5e92d7e53 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_utility.cpp
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_utility.cpp
@@ -51,7 +51,7 @@ FFmpeg::AvErrorWrap ProcessPacket(Stream &stream, FFmpeg::Packet &&packet) {
 		stream.codec.get(),
 		native->data ? native : nullptr); // Drain on eof.
 	if (error) {
-		LogError(qstr("avcodec_send_packet"), error);
+		LogError(u"avcodec_send_packet"_q, error);
 		if (error.code() == AVERROR_INVALIDDATA
 			// There is a sample voice message where skipping such packet
 			// results in a crash (read_access to nullptr) in swr_convert().
@@ -119,7 +119,7 @@ bool TransferFrame(
 	const auto error = FFmpeg::AvErrorWrap(
 		av_hwframe_transfer_data(transferredFrame, decodedFrame, 0));
 	if (error) {
-		LogError(qstr("av_hwframe_transfer_data"), error);
+		LogError(u"av_hwframe_transfer_data"_q, error);
 		return false;
 	}
 	FFmpeg::ClearFrameMemory(decodedFrame);
diff --git a/Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp b/Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp
index 630f830e2..993b50543 100644
--- a/Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp
+++ b/Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp
@@ -4523,7 +4523,7 @@ void OverlayWidget::handleMouseRelease(
 	updateOver(position);
 
 	if (const auto activated = ClickHandler::unpressed()) {
-		if (activated->dragText() == qstr("internal:show_saved_message")) {
+		if (activated->dragText() == u"internal:show_saved_message"_q) {
 			showSaveMsgFile();
 			return;
 		}
diff --git a/Telegram/SourceFiles/mtproto/mtp_instance.cpp b/Telegram/SourceFiles/mtproto/mtp_instance.cpp
index 457a60a76..d0f703570 100644
--- a/Telegram/SourceFiles/mtproto/mtp_instance.cpp
+++ b/Telegram/SourceFiles/mtproto/mtp_instance.cpp
@@ -1406,7 +1406,7 @@ bool Instance::Private::onErrorDefault(
 			(dcWithShift < 0) ? -newdcWithShift : newdcWithShift);
 		session->sendPrepared(request);
 		return true;
-	} else if (type == qstr("MSG_WAIT_TIMEOUT") || type == qstr("MSG_WAIT_FAILED")) {
+	} else if (type == u"MSG_WAIT_TIMEOUT"_q || type == u"MSG_WAIT_FAILED"_q) {
 		SerializedRequest request;
 		{
 			QReadLocker locker(&_requestMapLock);
@@ -1477,7 +1477,7 @@ bool Instance::Private::onErrorDefault(
 		checkDelayedRequests();
 
 		return true;
-	} else if ((code == 401 && type != qstr("AUTH_KEY_PERM_EMPTY"))
+	} else if ((code == 401 && type != u"AUTH_KEY_PERM_EMPTY"_q)
 		|| (badGuestDc && _badGuestDcRequests.find(requestId) == _badGuestDcRequests.cend())) {
 		auto dcWithShift = ShiftedDcId(0);
 		if (const auto shiftedDcId = queryRequestByDc(requestId)) {
@@ -1515,8 +1515,8 @@ bool Instance::Private::onErrorDefault(
 		waiters.push_back(requestId);
 		if (badGuestDc) _badGuestDcRequests.insert(requestId);
 		return true;
-	} else if (type == qstr("CONNECTION_NOT_INITED")
-		|| type == qstr("CONNECTION_LAYER_INVALID")) {
+	} else if (type == u"CONNECTION_NOT_INITED"_q
+		|| type == u"CONNECTION_LAYER_INVALID"_q) {
 		SerializedRequest request;
 		{
 			QReadLocker locker(&_requestMapLock);
@@ -1539,7 +1539,7 @@ bool Instance::Private::onErrorDefault(
 		request->needsLayer = true;
 		session->sendPrepared(request);
 		return true;
-	} else if (type == qstr("CONNECTION_LANG_CODE_INVALID")) {
+	} else if (type == u"CONNECTION_LANG_CODE_INVALID"_q) {
 		Lang::CurrentCloudManager().resetToDefault();
 	}
 	if (badGuestDc) _badGuestDcRequests.erase(requestId);
diff --git a/Telegram/SourceFiles/mtproto/mtproto_dc_options.cpp b/Telegram/SourceFiles/mtproto/mtproto_dc_options.cpp
index ec1b4f549..c659f8509 100644
--- a/Telegram/SourceFiles/mtproto/mtproto_dc_options.cpp
+++ b/Telegram/SourceFiles/mtproto/mtproto_dc_options.cpp
@@ -784,9 +784,9 @@ bool DcOptions::loadFromFile(const QString &path) {
 		for (auto &option : components.mid(3)) {
 			if (option.startsWith('#')) {
 				break;
-			} else if (option == qstr("tcpo_only")) {
+			} else if (option == u"tcpo_only"_q) {
 				flags |= Flag::f_tcpo_only;
-			} else if (option == qstr("media_only")) {
+			} else if (option == u"media_only"_q) {
 				flags |= Flag::f_media_only;
 			} else {
 				return error();
diff --git a/Telegram/SourceFiles/mtproto/mtproto_response.h b/Telegram/SourceFiles/mtproto/mtproto_response.h
index 247f1c7db..657546fcc 100644
--- a/Telegram/SourceFiles/mtproto/mtproto_response.h
+++ b/Telegram/SourceFiles/mtproto/mtproto_response.h
@@ -39,7 +39,7 @@ private:
 };
 
 inline bool IsFloodError(const QString &type) {
-	return type.startsWith(qstr("FLOOD_WAIT_"));
+	return type.startsWith(u"FLOOD_WAIT_"_q);
 }
 
 inline bool IsFloodError(const Error &error) {
diff --git a/Telegram/SourceFiles/overview/overview_layout.cpp b/Telegram/SourceFiles/overview/overview_layout.cpp
index 1aa48acf1..4ac13b6ea 100644
--- a/Telegram/SourceFiles/overview/overview_layout.cpp
+++ b/Telegram/SourceFiles/overview/overview_layout.cpp
@@ -1563,8 +1563,8 @@ Link::Link(
 			if (_page->type == WebPageType::Profile || _page->type == WebPageType::Video) {
 				_photol = createHandler(_page->url);
 			} else if (_page->type == WebPageType::Photo
-				|| _page->siteName == qstr("Twitter")
-				|| _page->siteName == qstr("Facebook")) {
+				|| _page->siteName == u"Twitter"_q
+				|| _page->siteName == u"Facebook"_q) {
 				_photol = std::make_shared<PhotoOpenClickHandler>(
 					_page->photo,
 					crl::guard(this, [=](FullMsgId id) {
diff --git a/Telegram/SourceFiles/passport/passport_form_controller.cpp b/Telegram/SourceFiles/passport/passport_form_controller.cpp
index ff27d2159..12f189fee 100644
--- a/Telegram/SourceFiles/passport/passport_form_controller.cpp
+++ b/Telegram/SourceFiles/passport/passport_form_controller.cpp
@@ -44,24 +44,24 @@ constexpr auto kShortPollTimeout = crl::time(3000);
 constexpr auto kRememberCredentialsDelay = crl::time(1800 * 1000);
 
 bool ForwardServiceErrorRequired(const QString &error) {
-	return (error == qstr("BOT_INVALID"))
-		|| (error == qstr("PUBLIC_KEY_REQUIRED"))
-		|| (error == qstr("PUBLIC_KEY_INVALID"))
-		|| (error == qstr("SCOPE_EMPTY"))
-		|| (error == qstr("PAYLOAD_EMPTY"));
+	return (error == u"BOT_INVALID"_q)
+		|| (error == u"PUBLIC_KEY_REQUIRED"_q)
+		|| (error == u"PUBLIC_KEY_INVALID"_q)
+		|| (error == u"SCOPE_EMPTY"_q)
+		|| (error == u"PAYLOAD_EMPTY"_q);
 }
 
 bool SaveErrorRequiresRestart(const QString &error) {
-	return (error == qstr("PASSWORD_REQUIRED"))
-		|| (error == qstr("SECURE_SECRET_REQUIRED"))
-		|| (error == qstr("SECURE_SECRET_INVALID"));
+	return (error == u"PASSWORD_REQUIRED"_q)
+		|| (error == u"SECURE_SECRET_REQUIRED"_q)
+		|| (error == u"SECURE_SECRET_INVALID"_q);
 }
 
 bool AcceptErrorRequiresRestart(const QString &error) {
-	return (error == qstr("PASSWORD_REQUIRED"))
-		|| (error == qstr("SECURE_SECRET_REQUIRED"))
-		|| (error == qstr("SECURE_VALUE_EMPTY"))
-		|| (error == qstr("SECURE_VALUE_HASH_INVALID"));
+	return (error == u"PASSWORD_REQUIRED"_q)
+		|| (error == u"SECURE_SECRET_REQUIRED"_q)
+		|| (error == u"SECURE_VALUE_EMPTY"_q)
+		|| (error == u"SECURE_VALUE_HASH_INVALID"_q);
 }
 
 std::map<QString, QString> GetTexts(const ValueMap &map) {
@@ -884,7 +884,7 @@ void FormController::submitPassword(
 		}
 	}).fail([=](const MTP::Error &error) {
 		_passwordCheckRequestId = 0;
-		if (error.type() == qstr("SRP_ID_INVALID")) {
+		if (error.type() == u"SRP_ID_INVALID"_q) {
 			handleSrpIdInvalid(_passwordCheckRequestId);
 		} else if (submitSaved) {
 			// Force reload and show form.
@@ -892,8 +892,8 @@ void FormController::submitPassword(
 			reloadPassword();
 		} else if (MTP::IsFloodError(error)) {
 			_passwordError.fire(tr::lng_flood_error(tr::now));
-		} else if (error.type() == qstr("PASSWORD_HASH_INVALID")
-			|| error.type() == qstr("SRP_PASSWORD_CHANGED")) {
+		} else if (error.type() == u"PASSWORD_HASH_INVALID"_q
+			|| error.type() == u"SRP_PASSWORD_CHANGED"_q) {
 			_passwordError.fire(tr::lng_passport_password_wrong(tr::now));
 		} else {
 			_passwordError.fire_copy(error.type());
@@ -963,7 +963,7 @@ void FormController::checkSavedPasswordSettings(
 		}
 	}).fail([=](const MTP::Error &error) {
 		_passwordCheckRequestId = 0;
-		if (error.type() != qstr("SRP_ID_INVALID")
+		if (error.type() != u"SRP_ID_INVALID"_q
 			|| !handleSrpIdInvalid(_passwordCheckRequestId)) {
 		} else {
 			session().data().forgetPassportCredentials();
@@ -1126,7 +1126,7 @@ void FormController::resetSecret(
 		generateSecret(password);
 	}).fail([=](const MTP::Error &error) {
 		_saveSecretRequestId = 0;
-		if (error.type() != qstr("SRP_ID_INVALID")
+		if (error.type() != u"SRP_ID_INVALID"_q
 			|| !handleSrpIdInvalid(_saveSecretRequestId)) {
 			formFail(error.type());
 		}
@@ -1709,7 +1709,7 @@ void FormController::verify(
 				clearValueVerification(nonconst);
 			}).fail([=](const MTP::Error &error) {
 				nonconst->verification.requestId = 0;
-				if (error.type() == qstr("PHONE_CODE_INVALID")) {
+				if (error.type() == u"PHONE_CODE_INVALID"_q) {
 					verificationError(
 						nonconst,
 						tr::lng_signin_wrong_code(tr::now));
@@ -1726,7 +1726,7 @@ void FormController::verify(
 				clearValueVerification(nonconst);
 			}).fail([=](const MTP::Error &error) {
 				nonconst->verification.requestId = 0;
-				if (error.type() == qstr("CODE_INVALID")) {
+				if (error.type() == u"CODE_INVALID"_q) {
 					verificationError(
 						nonconst,
 						tr::lng_signin_wrong_code(tr::now));
@@ -2107,24 +2107,24 @@ void FormController::sendSaveRequest(
 		value->saveRequestId = 0;
 		const auto code = error.type();
 		if (handleAppUpdateError(code)) {
-		} else if (code == qstr("PHONE_VERIFICATION_NEEDED")) {
+		} else if (code == u"PHONE_VERIFICATION_NEEDED"_q) {
 			if (value->type == Value::Type::Phone) {
 				startPhoneVerification(value);
 				return;
 			}
-		} else if (code == qstr("PHONE_NUMBER_INVALID")) {
+		} else if (code == u"PHONE_NUMBER_INVALID"_q) {
 			if (value->type == Value::Type::Phone) {
 				value->data.parsedInEdit.fields["value"].error
 					= tr::lng_bad_phone(tr::now);
 				valueSaveFailed(value);
 				return;
 			}
-		} else if (code == qstr("EMAIL_VERIFICATION_NEEDED")) {
+		} else if (code == u"EMAIL_VERIFICATION_NEEDED"_q) {
 			if (value->type == Value::Type::Email) {
 				startEmailVerification(value);
 				return;
 			}
-		} else if (code == qstr("EMAIL_INVALID")) {
+		} else if (code == u"EMAIL_INVALID"_q) {
 			if (value->type == Value::Type::Email) {
 				value->data.parsedInEdit.fields["value"].error
 					= tr::lng_cloud_password_bad_email(tr::now);
@@ -2325,7 +2325,7 @@ void FormController::saveSecret(
 		}
 	}).fail([=](const MTP::Error &error) {
 		_saveSecretRequestId = 0;
-		if (error.type() != qstr("SRP_ID_INVALID")
+		if (error.type() != u"SRP_ID_INVALID"_q
 			|| !handleSrpIdInvalid(_saveSecretRequestId)) {
 			suggestRestart();
 		}
@@ -2608,7 +2608,7 @@ void FormController::formFail(const QString &error) {
 }
 
 bool FormController::handleAppUpdateError(const QString &error) {
-	if (error == qstr("APP_VERSION_OUTDATED")) {
+	if (error == u"APP_VERSION_OUTDATED"_q) {
 		_view->showUpdateAppBox();
 		return true;
 	}
diff --git a/Telegram/SourceFiles/passport/passport_panel_controller.cpp b/Telegram/SourceFiles/passport/passport_panel_controller.cpp
index d4b96b3c6..0e72eef40 100644
--- a/Telegram/SourceFiles/passport/passport_panel_controller.cpp
+++ b/Telegram/SourceFiles/passport/passport_panel_controller.cpp
@@ -128,9 +128,9 @@ EditDocumentScheme GetDocumentScheme(
 		return result.isEmpty() ? value : result;
 	};
 	const auto GenderFormat = [](const QString &value) {
-		if (value == qstr("male")) {
+		if (value == u"male"_q) {
 			return tr::lng_passport_gender_male(tr::now);
-		} else if (value == qstr("female")) {
+		} else if (value == u"female"_q) {
 			return tr::lng_passport_gender_female(tr::now);
 		}
 		return value;
@@ -179,7 +179,7 @@ EditDocumentScheme GetDocumentScheme(
 		return value.isEmpty() || DateValidateBoolean(value);
 	});
 	const auto GenderValidate = FromBoolean([](const QString &value) {
-		return value == qstr("male") || value == qstr("female");
+		return value == u"male"_q || value == u"female"_q;
 	});
 	const auto CountryValidate = FromBoolean([=](const QString &value) {
 		return !CountryFormat(value).isEmpty();
diff --git a/Telegram/SourceFiles/passport/ui/passport_details_row.cpp b/Telegram/SourceFiles/passport/ui/passport_details_row.cpp
index 9c9618055..c567989f0 100644
--- a/Telegram/SourceFiles/passport/ui/passport_details_row.cpp
+++ b/Telegram/SourceFiles/passport/ui/passport_details_row.cpp
@@ -885,9 +885,9 @@ std::unique_ptr<AbstractCheckView> GenderRow::createRadioView(
 
 auto GenderRow::StringToGender(const QString &value)
 -> std::optional<Gender> {
-	if (value == qstr("male")) {
+	if (value == u"male"_q) {
 		return Gender::Male;
-	} else if (value == qstr("female")) {
+	} else if (value == u"female"_q) {
 		return Gender::Female;
 	}
 	return std::nullopt;
diff --git a/Telegram/SourceFiles/platform/linux/file_utilities_linux.cpp b/Telegram/SourceFiles/platform/linux/file_utilities_linux.cpp
index b06d5bae8..b90b70a45 100644
--- a/Telegram/SourceFiles/platform/linux/file_utilities_linux.cpp
+++ b/Telegram/SourceFiles/platform/linux/file_utilities_linux.cpp
@@ -39,7 +39,7 @@ void UnsafeOpenUrl(const QString &url) {
 }
 
 void UnsafeOpenEmailLink(const QString &email) {
-	UnsafeOpenUrl(qstr("mailto:") + email);
+	UnsafeOpenUrl(u"mailto:"_q + email);
 }
 
 bool UnsafeShowOpenWith(const QString &filepath) {
diff --git a/Telegram/SourceFiles/storage/details/storage_settings_scheme.cpp b/Telegram/SourceFiles/storage/details/storage_settings_scheme.cpp
index bba67a1b9..fda6ba02e 100644
--- a/Telegram/SourceFiles/storage/details/storage_settings_scheme.cpp
+++ b/Telegram/SourceFiles/storage/details/storage_settings_scheme.cpp
@@ -936,7 +936,7 @@ bool ReadSetting(
 		stream >> v;
 		if (!CheckStreamStatus(stream)) return false;
 #ifndef OS_WIN_STORE
-		if (!v.isEmpty() && v != qstr("tmp") && !v.endsWith('/')) v += '/';
+		if (!v.isEmpty() && v != u"tmp"_q && !v.endsWith('/')) v += '/';
 		Core::App().settings().setDownloadPathBookmark(QByteArray());
 		Core::App().settings().setDownloadPath(v);
 #endif // OS_WIN_STORE
@@ -950,7 +950,7 @@ bool ReadSetting(
 		if (!CheckStreamStatus(stream)) return false;
 
 #ifndef OS_WIN_STORE
-		if (!v.isEmpty() && v != qstr("tmp") && !v.endsWith('/')) v += '/';
+		if (!v.isEmpty() && v != u"tmp"_q && !v.endsWith('/')) v += '/';
 		Core::App().settings().setDownloadPathBookmark(bookmark);
 		Core::App().settings().setDownloadPath(v);
 		psDownloadPathEnableAccess();
diff --git a/Telegram/SourceFiles/storage/download_manager_mtproto.cpp b/Telegram/SourceFiles/storage/download_manager_mtproto.cpp
index 3cdc14276..d6752e768 100644
--- a/Telegram/SourceFiles/storage/download_manager_mtproto.cpp
+++ b/Telegram/SourceFiles/storage/download_manager_mtproto.cpp
@@ -904,7 +904,7 @@ bool DownloadMtprotoTask::normalPartFailed(
 		return false;
 	}
 	if (error.code() == 400
-		&& error.type().startsWith(qstr("FILE_REFERENCE_"))) {
+		&& error.type().startsWith(u"FILE_REFERENCE_"_q)) {
 		api().refreshFileReference(
 			_origin,
 			this,
@@ -932,8 +932,8 @@ bool DownloadMtprotoTask::cdnPartFailed(
 		return false;
 	}
 
-	if (error.type() == qstr("FILE_TOKEN_INVALID")
-		|| error.type() == qstr("REQUEST_TOKEN_INVALID")) {
+	if (error.type() == u"FILE_TOKEN_INVALID"_q
+		|| error.type() == u"REQUEST_TOKEN_INVALID"_q) {
 		const auto requestData = finishSentRequest(
 			requestId,
 			FinishRequestReason::Redirect);
diff --git a/Telegram/SourceFiles/storage/file_upload.cpp b/Telegram/SourceFiles/storage/file_upload.cpp
index a1098e909..160314022 100644
--- a/Telegram/SourceFiles/storage/file_upload.cpp
+++ b/Telegram/SourceFiles/storage/file_upload.cpp
@@ -455,11 +455,11 @@ void Uploader::sendNext() {
 					: std::vector<MTPInputDocument>();
 				if (uploadingData.type() == SendMediaType::Photo) {
 					auto photoFilename = uploadingData.filename();
-					if (!photoFilename.endsWith(qstr(".jpg"), Qt::CaseInsensitive)) {
+					if (!photoFilename.endsWith(u".jpg"_q, Qt::CaseInsensitive)) {
 						// Server has some extensions checking for inputMediaUploadedPhoto,
 						// so force the extension to be .jpg anyway. It doesn't matter,
 						// because the filename from inputFile is not used anywhere.
-						photoFilename += qstr(".jpg");
+						photoFilename += u".jpg"_q;
 					}
 					const auto md5 = uploadingData.file
 						? uploadingData.file->filemd5
diff --git a/Telegram/SourceFiles/storage/localimageloader.cpp b/Telegram/SourceFiles/storage/localimageloader.cpp
index f15539d58..0060fcf7d 100644
--- a/Telegram/SourceFiles/storage/localimageloader.cpp
+++ b/Telegram/SourceFiles/storage/localimageloader.cpp
@@ -606,21 +606,21 @@ bool FileLoadTask::CheckForSong(
 		const QByteArray &content,
 		std::unique_ptr<Ui::PreparedFileInformation> &result) {
 	static const auto mimes = {
-		qstr("audio/mp3"),
-		qstr("audio/m4a"),
-		qstr("audio/aac"),
-		qstr("audio/ogg"),
-		qstr("audio/flac"),
-		qstr("audio/opus"),
+		u"audio/mp3"_q,
+		u"audio/m4a"_q,
+		u"audio/aac"_q,
+		u"audio/ogg"_q,
+		u"audio/flac"_q,
+		u"audio/opus"_q,
 	};
 	static const auto extensions = {
-		qstr(".mp3"),
-		qstr(".m4a"),
-		qstr(".aac"),
-		qstr(".ogg"),
-		qstr(".flac"),
-		qstr(".opus"),
-		qstr(".oga"),
+		u".mp3"_q,
+		u".m4a"_q,
+		u".aac"_q,
+		u".ogg"_q,
+		u".flac"_q,
+		u".opus"_q,
+		u".oga"_q,
 	};
 	if (!filepath.isEmpty()
 		&& !CheckMimeOrExtensions(
@@ -648,13 +648,13 @@ bool FileLoadTask::CheckForVideo(
 		const QByteArray &content,
 		std::unique_ptr<Ui::PreparedFileInformation> &result) {
 	static const auto mimes = {
-		qstr("video/mp4"),
-		qstr("video/quicktime"),
+		u"video/mp4"_q,
+		u"video/quicktime"_q,
 	};
 	static const auto extensions = {
-		qstr(".mp4"),
-		qstr(".mov"),
-		qstr(".webm"),
+		u".mp4"_q,
+		u".mov"_q,
+		u".webm"_q,
 	};
 	if (!CheckMimeOrExtensions(filepath, result->filemime, mimes, extensions)) {
 		return false;
@@ -672,8 +672,8 @@ bool FileLoadTask::CheckForVideo(
 		return false;
 	}
 
-	if (filepath.endsWith(qstr(".mp4"), Qt::CaseInsensitive)) {
-		result->filemime = qstr("video/mp4");
+	if (filepath.endsWith(u".mp4"_q, Qt::CaseInsensitive)) {
+		result->filemime = u"video/mp4"_q;
 	}
 	result->media = std::move(media);
 	return true;
@@ -684,12 +684,12 @@ bool FileLoadTask::CheckForImage(
 		const QByteArray &content,
 		std::unique_ptr<Ui::PreparedFileInformation> &result) {
 	auto read = [&] {
-		if (filepath.endsWith(qstr(".tgs"), Qt::CaseInsensitive)) {
+		if (filepath.endsWith(u".tgs"_q, Qt::CaseInsensitive)) {
 			auto image = Lottie::ReadThumbnail(
 				Lottie::ReadContent(content, filepath));
 			const auto success = !image.isNull();
 			if (success) {
-				result->filemime = qstr("application/x-tgsticker");
+				result->filemime = u"application/x-tgsticker"_q;
 			}
 			return Images::ReadResult{
 				.image = std::move(image),
@@ -898,8 +898,8 @@ void FileLoadTask::process(Args &&args) {
 				}
 			}
 			thumbnail = PrepareFileThumbnail(std::move(video->thumbnail));
-		} else if (filemime == qstr("application/x-tdesktop-theme")
-			|| filemime == qstr("application/x-tgtheme-tdesktop")) {
+		} else if (filemime == u"application/x-tdesktop-theme"_q
+			|| filemime == u"application/x-tgtheme-tdesktop"_q) {
 			goodThumbnail = Window::Theme::GeneratePreview(_content, _filepath);
 			if (!goodThumbnail.isNull()) {
 				QBuffer buffer(&goodThumbnailBytes);
diff --git a/Telegram/SourceFiles/storage/localstorage.cpp b/Telegram/SourceFiles/storage/localstorage.cpp
index 684833030..f097c1806 100644
--- a/Telegram/SourceFiles/storage/localstorage.cpp
+++ b/Telegram/SourceFiles/storage/localstorage.cpp
@@ -51,7 +51,7 @@ constexpr auto kWallPaperLegacySerializeTagId = int32(-111);
 constexpr auto kWallPaperSerializeTagId = int32(-112);
 constexpr auto kWallPaperSidesLimit = 10'000;
 
-const auto kThemeNewPathRelativeTag = qstr("special://new_tag");
+const auto kThemeNewPathRelativeTag = u"special://new_tag"_q;
 
 using namespace Storage::details;
 using Storage::FileKey;
diff --git a/Telegram/SourceFiles/storage/storage_account.cpp b/Telegram/SourceFiles/storage/storage_account.cpp
index c2fea1afe..fb97de46e 100644
--- a/Telegram/SourceFiles/storage/storage_account.cpp
+++ b/Telegram/SourceFiles/storage/storage_account.cpp
@@ -638,10 +638,10 @@ void Account::reset() {
 
 	crl::async([base = _basePath, temp = _tempPath, names = std::move(names)] {
 		for (const auto &name : names) {
-			if (!name.endsWith(qstr("map0"))
-				&& !name.endsWith(qstr("map1"))
-				&& !name.endsWith(qstr("maps"))
-				&& !name.endsWith(qstr("configs"))) {
+			if (!name.endsWith(u"map0"_q)
+				&& !name.endsWith(u"map1"_q)
+				&& !name.endsWith(u"maps"_q)
+				&& !name.endsWith(u"configs"_q)) {
 				QFile::remove(base + name);
 			}
 		}
diff --git a/Telegram/SourceFiles/support/support_autocomplete.cpp b/Telegram/SourceFiles/support/support_autocomplete.cpp
index 696a8457e..1e7bb00d4 100644
--- a/Telegram/SourceFiles/support/support_autocomplete.cpp
+++ b/Telegram/SourceFiles/support/support_autocomplete.cpp
@@ -129,7 +129,7 @@ void Inner::prepareRow(Row &row) {
 	row.question.setText(st::autocompleteRowTitle, row.data.question);
 	row.keys.setText(
 		st::autocompleteRowKeys,
-		row.data.originalKeys.join(qstr(", ")));
+		row.data.originalKeys.join(u", "_q));
 	row.answer.setText(st::autocompleteRowAnswer, row.data.value);
 }
 
@@ -470,7 +470,7 @@ void Autocomplete::setupContent() {
 }
 
 void Autocomplete::submitValue(const QString &value) {
-	const auto prefix = qstr("contact:");
+	const auto prefix = u"contact:"_q;
 	if (value.startsWith(prefix)) {
 		const auto line = value.indexOf('\n');
 		const auto text = (line > 0) ? value.mid(line + 1) : QString();
diff --git a/Telegram/SourceFiles/support/support_helper.cpp b/Telegram/SourceFiles/support/support_helper.cpp
index 5c4a57160..6a238c40b 100644
--- a/Telegram/SourceFiles/support/support_helper.cpp
+++ b/Telegram/SourceFiles/support/support_helper.cpp
@@ -187,13 +187,13 @@ uint32 ParseOccupationTag(History *history) {
 	auto valid = false;
 	auto result = uint32();
 	for (const auto &part : parts) {
-		if (part.startsWith(qstr("t:"))) {
+		if (part.startsWith(u"t:"_q)) {
 			if (base::StringViewMid(part, 2).toInt() >= base::unixtime::now()) {
 				valid = true;
 			} else {
 				return 0;
 			}
-		} else if (part.startsWith(qstr("u:"))) {
+		} else if (part.startsWith(u"u:"_q)) {
 			result = base::StringViewMid(part, 2).toUInt();
 		}
 	}
@@ -213,13 +213,13 @@ QString ParseOccupationName(History *history) {
 	auto valid = false;
 	auto result = QString();
 	for (const auto &part : parts) {
-		if (part.startsWith(qstr("t:"))) {
+		if (part.startsWith(u"t:"_q)) {
 			if (base::StringViewMid(part, 2).toInt() >= base::unixtime::now()) {
 				valid = true;
 			} else {
 				return 0;
 			}
-		} else if (part.startsWith(qstr("n:"))) {
+		} else if (part.startsWith(u"n:"_q)) {
 			result = base::StringViewMid(part, 2).toString();
 		}
 	}
@@ -239,13 +239,13 @@ TimeId OccupiedBySomeoneTill(History *history) {
 	auto valid = false;
 	auto result = TimeId();
 	for (const auto &part : parts) {
-		if (part.startsWith(qstr("t:"))) {
+		if (part.startsWith(u"t:"_q)) {
 			if (base::StringViewMid(part, 2).toInt() >= base::unixtime::now()) {
 				result = base::StringViewMid(part, 2).toInt();
 			} else {
 				return 0;
 			}
-		} else if (part.startsWith(qstr("u:"))) {
+		} else if (part.startsWith(u"u:"_q)) {
 			if (base::StringViewMid(part, 2).toUInt() != OccupationTag()) {
 				valid = true;
 			} else {
@@ -279,7 +279,7 @@ Helper::Helper(not_null<Main::Session*> session)
 
 std::unique_ptr<Helper> Helper::Create(not_null<Main::Session*> session) {
 	//return std::make_unique<Helper>(session); AssertIsDebug();
-	const auto valid = session->user()->phone().startsWith(qstr("424"));
+	const auto valid = session->user()->phone().startsWith(u"424"_q);
 	return valid ? std::make_unique<Helper>(session) : nullptr;
 }
 
@@ -547,7 +547,7 @@ Templates &Helper::templates() {
 QString ChatOccupiedString(not_null<History*> history) {
 	const auto hand = QString::fromUtf8("\xe2\x9c\x8b\xef\xb8\x8f");
 	const auto name = ParseOccupationName(history);
-	return (name.isEmpty() || name.startsWith(qstr("[rand^")))
+	return (name.isEmpty() || name.startsWith(u"[rand^"_q))
 		? hand + " chat taken"
 		: hand + ' ' + name + " is here";
 }
@@ -566,26 +566,26 @@ QString InterpretSendPath(
 	auto filePath = QString();
 	auto caption = QString();
 	for (const auto &line : lines) {
-		if (line.startsWith(qstr("from: "))) {
+		if (line.startsWith(u"from: "_q)) {
 			if (window->session().userId().bare
 				!= base::StringViewMid(
 					line,
-					qstr("from: ").size()).toULongLong()) {
+					u"from: "_q.size()).toULongLong()) {
 				return "App Error: Wrong current user.";
 			}
-		} else if (line.startsWith(qstr("channel: "))) {
+		} else if (line.startsWith(u"channel: "_q)) {
 			const auto channelId = base::StringViewMid(
 				line,
-				qstr("channel: ").size()).toULongLong();
+				u"channel: "_q.size()).toULongLong();
 			toId = peerFromChannel(channelId);
-		} else if (line.startsWith(qstr("file: "))) {
-			const auto path = line.mid(qstr("file: ").size());
+		} else if (line.startsWith(u"file: "_q)) {
+			const auto path = line.mid(u"file: "_q.size());
 			if (!QFile(path).exists()) {
 				return "App Error: Could not find file with path: " + path;
 			}
 			filePath = path;
-		} else if (line.startsWith(qstr("caption: "))) {
-			caption = line.mid(qstr("caption: ").size());
+		} else if (line.startsWith(u"caption: "_q)) {
+			caption = line.mid(u"caption: "_q.size());
 		} else if (!caption.isEmpty()) {
 			caption += '\n' + line;
 		} else {
diff --git a/Telegram/SourceFiles/support/support_templates.cpp b/Telegram/SourceFiles/support/support_templates.cpp
index d665b3fd4..c06f45566 100644
--- a/Telegram/SourceFiles/support/support_templates.cpp
+++ b/Telegram/SourceFiles/support/support_templates.cpp
@@ -34,8 +34,8 @@ struct Delta {
 };
 
 bool IsTemplatesFile(const QString &file) {
-	return file.startsWith(qstr("tl_"), Qt::CaseInsensitive)
-		&& file.endsWith(qstr(".txt"), Qt::CaseInsensitive);
+	return file.startsWith(u"tl_"_q, Qt::CaseInsensitive)
+		&& file.endsWith(u".txt"_q, Qt::CaseInsensitive);
 }
 
 QString NormalizeQuestion(const QString &question) {
@@ -86,13 +86,13 @@ void ReadByLine(
 				hadKeys = hadValue = false;
 			}
 			const auto newState = [&] {
-				if (token == qstr("VALUE")) {
+				if (token == u"VALUE"_q) {
 					return hadValue ? State::None : State::Value;
-				} else if (token == qstr("KEYS")) {
+				} else if (token == u"KEYS"_q) {
 					return hadKeys ? State::None : State::Keys;
-				} else if (token == qstr("QUESTION")) {
+				} else if (token == u"QUESTION"_q) {
 					return State::Question;
-				} else if (token == qstr("URL")) {
+				} else if (token == u"URL"_q) {
 					return State::Url;
 				} else {
 					return State::None;
@@ -376,7 +376,7 @@ Delta ComputeDelta(const TemplatesFile &was, const TemplatesFile &now) {
 QString FormatUpdateNotification(const QString &path, const Delta &delta) {
 	auto result = qsl("Template file '%1' updated!\n\n").arg(path);
 	if (!delta.added.empty()) {
-		result += qstr("-------- Added --------\n\n");
+		result += u"-------- Added --------\n\n"_q;
 		for (const auto question : delta.added) {
 			result += qsl("Q: %1\nK: %2\nA: %3\n\n").arg(
 				question->question,
@@ -385,7 +385,7 @@ QString FormatUpdateNotification(const QString &path, const Delta &delta) {
 		}
 	}
 	if (!delta.changed.empty()) {
-		result += qstr("-------- Modified --------\n\n");
+		result += u"-------- Modified --------\n\n"_q;
 		for (const auto question : delta.changed) {
 			result += qsl("Q: %1\nA: %2\n\n").arg(
 				question->question,
@@ -393,7 +393,7 @@ QString FormatUpdateNotification(const QString &path, const Delta &delta) {
 		}
 	}
 	if (!delta.removed.empty()) {
-		result += qstr("-------- Removed --------\n\n");
+		result += u"-------- Removed --------\n\n"_q;
 		for (const auto question : delta.removed) {
 			result += qsl("Q: %1\n\n").arg(question->question);
 		}
@@ -408,11 +408,11 @@ QString UpdateFile(
 	const Delta &delta) {
 	auto result = QString();
 	const auto full = cWorkingDir() + "TEMPLATES/" + path;
-	const auto old = full + qstr(".old");
+	const auto old = full + u".old"_q;
 	QFile(old).remove();
 	if (QFile(full).copy(old)) {
 		result += qsl("(old file saved at '%1')"
-		).arg(path + qstr(".old"));
+		).arg(path + u".old"_q);
 
 		QFile f(full);
 		if (f.open(QIODevice::WriteOnly)) {
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_prepare.cpp b/Telegram/SourceFiles/ui/chat/attach/attach_prepare.cpp
index 67d124366..b57b6fb00 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_prepare.cpp
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_prepare.cpp
@@ -148,9 +148,7 @@ bool PreparedList::canAddCaption(bool sendingAlbum, bool compress) const {
 		Assert(files.front().information != nullptr);
 		const auto isSticker = (!compress
 				&& Core::IsMimeSticker(files.front().information->filemime))
-			|| files.front().path.endsWith(
-				qstr(".tgs"),
-				Qt::CaseInsensitive);
+			|| files.front().path.endsWith(u".tgs"_q, Qt::CaseInsensitive);
 		return !isSticker;
 	} else if (!sendingAlbum) {
 		return false;
diff --git a/Telegram/SourceFiles/ui/widgets/fields/special_fields.cpp b/Telegram/SourceFiles/ui/widgets/fields/special_fields.cpp
index a58eff7ac..e9b4a3d43 100644
--- a/Telegram/SourceFiles/ui/widgets/fields/special_fields.cpp
+++ b/Telegram/SourceFiles/ui/widgets/fields/special_fields.cpp
@@ -419,7 +419,7 @@ void PhoneInput::correctValue(
 			plusFound = true;
 		}
 	}
-	if (!plusFound && newText == qstr("+")) {
+	if (!plusFound && newText == u"+"_q) {
 		newText = QString();
 		newPos = 0;
 	}
diff --git a/Telegram/SourceFiles/window/themes/window_theme.cpp b/Telegram/SourceFiles/window/themes/window_theme.cpp
index 0dbde35ff..60def7370 100644
--- a/Telegram/SourceFiles/window/themes/window_theme.cpp
+++ b/Telegram/SourceFiles/window/themes/window_theme.cpp
@@ -1259,7 +1259,7 @@ ChatBackground *Background() {
 }
 
 bool IsEmbeddedTheme(const QString &path) {
-	return path.isEmpty() || path.startsWith(qstr(":/gui/"));
+	return path.isEmpty() || path.startsWith(u":/gui/"_q);
 }
 
 bool Initialize(Saved &&saved) {
diff --git a/Telegram/SourceFiles/window/themes/window_theme_editor_box.cpp b/Telegram/SourceFiles/window/themes/window_theme_editor_box.cpp
index 6e34990b7..f3a3f04d1 100644
--- a/Telegram/SourceFiles/window/themes/window_theme_editor_box.cpp
+++ b/Telegram/SourceFiles/window/themes/window_theme_editor_box.cpp
@@ -612,7 +612,7 @@ Fn<void()> SavePreparedTheme(
 		)).done([=](const MTPTheme &result) {
 			save();
 		}).fail([=](const MTP::Error &error) {
-			if (error.type() == qstr("THEME_FILE_INVALID")) {
+			if (error.type() == u"THEME_FILE_INVALID"_q) {
 				save();
 			} else {
 				fail(SaveErrorType::Other, error.type());
@@ -887,11 +887,11 @@ void SaveThemeBox(
 				const QString &error) {
 			*saving = false;
 			box->showLoading(false);
-			if (error == qstr("THEME_TITLE_INVALID")) {
+			if (error == u"THEME_TITLE_INVALID"_q) {
 				type = SaveErrorType::Name;
-			} else if (error == qstr("THEME_SLUG_INVALID")) {
+			} else if (error == u"THEME_SLUG_INVALID"_q) {
 				type = SaveErrorType::Link;
-			} else if (error == qstr("THEME_SLUG_OCCUPIED")) {
+			} else if (error == u"THEME_SLUG_OCCUPIED"_q) {
 				Ui::Toast::Show(
 					Ui::BoxShow(box).toastParent(),
 					tr::lng_create_channel_link_occupied(tr::now));