Display a disclaimer about proxy sponsor.

Telegram/Resources/langs/lang.strings

@@ -442,6 +442,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_proxy_credentials_optional" = "Credentials (optional)";
 "lng_proxy_credentials" = "Credentials";
 "lng_proxy_description" = "Your saved proxy list will be here.";
+"lng_proxy_sponsor" = "Proxy sponsor";
+"lng_proxy_sponsor_about" = "This channel is shown by your proxy server.\nTo remove this channel from your chats list,\ndisable the proxy in Telegram Settings.";
 
 "lng_settings_blocked_users" = "Blocked users";
 "lng_settings_last_seen_privacy" = "Last seen privacy";

Telegram/SourceFiles/auth_session.cpp

@@ -288,6 +288,8 @@ AuthSession::AuthSession(UserId userId)
 	subscribe(Global::RefConnectionTypeChanged(), [=] {
 		_api->refreshProxyPromotion();
 	});
+	_api->refreshProxyPromotion();
+
 	Window::Theme::Background()->start();
 }
 

Telegram/SourceFiles/data/data_session.cpp

@@ -1601,13 +1601,21 @@ void Session::setProxyPromoted(PeerData *promoted) {
 		if (const auto history = App::historyLoaded(_proxyPromoted)) {
 			history->cacheProxyPromoted(false);
 		}
-		_proxyPromoted = promoted;
+		const auto old = std::exchange(_proxyPromoted, promoted);
 		if (_proxyPromoted) {
 			const auto history = App::history(_proxyPromoted);
 			history->cacheProxyPromoted(true);
 			if (!history->lastMessageKnown()) {
 				_session->api().requestDialogEntry(history);
 			}
+			Notify::peerUpdatedDelayed(
+				_proxyPromoted,
+				Notify::PeerUpdate::Flag::ChannelPromotedChanged);
+		}
+		if (old) {
+			Notify::peerUpdatedDelayed(
+				old,
+				Notify::PeerUpdate::Flag::ChannelPromotedChanged);
 		}
 	}
 }

Telegram/SourceFiles/dialogs/dialogs_entry.cpp

@@ -58,6 +58,9 @@ void Entry::cacheProxyPromoted(bool promoted) {
 		_isProxyPromoted = promoted;
 		updateChatListSortPosition();
 		updateChatListEntry();
+		if (!_isProxyPromoted) {
+			updateChatListExistence();
+		}
 	}
 }
 

Telegram/SourceFiles/dialogs/dialogs_layout.cpp

@@ -138,7 +138,7 @@ void paintRow(
 
 	const auto promoted = chat.entry()->useProxyPromotion();
 	if (promoted) {
-		const auto text = QString("Proxy sponsor");
+		const auto text = lang(lng_proxy_sponsor);
 		paintRowTopRight(p, text, rectForName, active, selected);
 	} else if (from && !(flags & Flag::FeedSearchResult)) {
 		if (const auto chatTypeIcon = ChatTypeIcon(from, active, selected)) {

Telegram/SourceFiles/history/history.style

@@ -456,3 +456,9 @@ historyGroupWidthMin: minPhotoSize;
 historyGroupSkip: 4px;
 historyGroupRadialSize: 44px;
 historyGroupRadialLine: 3px;
+
+historyAboutProxy: FlatLabel(defaultFlatLabel) {
+	align: align(top);
+	textFg: windowSubTextFg;
+}
+historyAboutProxyPadding: margins(20px, 10px, 20px, 10px);

Telegram/SourceFiles/history/history_widget.cpp

@@ -617,7 +617,8 @@ HistoryWidget::HistoryWidget(
 		| UpdateFlag::MembersChanged
 		| UpdateFlag::UserOnlineChanged
 		| UpdateFlag::NotificationsEnabled
-		| UpdateFlag::ChannelAmIn;
+		| UpdateFlag::ChannelAmIn
+		| UpdateFlag::ChannelPromotedChanged;
 	subscribe(Notify::PeerUpdated(), Notify::PeerUpdatedHandler(changes, [this](const Notify::PeerUpdate &update) {
 		if (update.peer == _peer) {
 			if (update.flags & UpdateFlag::ChannelRightsChanged) {
@@ -652,6 +653,13 @@ HistoryWidget::HistoryWidget(
 					this->update();
 				}
 			}
+			if (update.flags & UpdateFlag::ChannelPromotedChanged) {
+				refreshAboutProxyPromotion();
+				updateHistoryGeometry();
+				updateControlsVisibility();
+				updateControlsGeometry();
+				this->update();
+			}
 			if (update.flags & (UpdateFlag::UserIsBlocked
 				| UpdateFlag::AdminsChanged
 				| UpdateFlag::MembersChanged
@@ -2085,6 +2093,7 @@ void HistoryWidget::updateControlsVisibility() {
 	if (_reportSpamPanel) {
 		_reportSpamPanel->show();
 	}
+	refreshAboutProxyPromotion();
 	if (!editingMessage() && (isBlocked() || isJoinChannel() || isMuteUnmute() || isBotStart())) {
 		if (isBlocked()) {
 			_joinChannel->hide();
@@ -2246,6 +2255,24 @@ void HistoryWidget::updateControlsVisibility() {
 	updateMouseTracking();
 }
 
+void HistoryWidget::refreshAboutProxyPromotion() {
+	if (_history->useProxyPromotion()) {
+		if (!_aboutProxyPromotion) {
+			_aboutProxyPromotion = object_ptr<Ui::PaddingWrap<Ui::FlatLabel>>(
+				this,
+				object_ptr<Ui::FlatLabel>(
+					this,
+					lang(lng_proxy_sponsor_about),
+					Ui::FlatLabel::InitType::Simple,
+					st::historyAboutProxy),
+				st::historyAboutProxyPadding);
+		}
+		_aboutProxyPromotion->show();
+	} else {
+		_aboutProxyPromotion.destroy();
+	}
+}
+
 void HistoryWidget::updateMouseTracking() {
 	bool trackMouse = !_fieldBarCancel->isHidden() || _pinnedBar;
 	setMouseTracking(trackMouse);
@@ -3911,6 +3938,12 @@ void HistoryWidget::moveFieldControls() {
 	_unblock->setGeometry(fullWidthButtonRect);
 	_joinChannel->setGeometry(fullWidthButtonRect);
 	_muteUnmute->setGeometry(fullWidthButtonRect);
+
+	if (_aboutProxyPromotion) {
+		_aboutProxyPromotion->moveToLeft(
+			0,
+			fullWidthButtonRect.y() - _aboutProxyPromotion->height());
+	}
 }
 
 void HistoryWidget::updateTabbedSelectorToggleTooltipGeometry() {
@@ -4729,6 +4762,10 @@ void HistoryWidget::updateHistoryGeometry(bool initial, bool loadedDown, const S
 	auto newScrollHeight = height() - _topBar->height();
 	if (!editingMessage() && (isBlocked() || isBotStart() || isJoinChannel() || isMuteUnmute())) {
 		newScrollHeight -= _unblock->height();
+		if (_aboutProxyPromotion) {
+			_aboutProxyPromotion->resizeToWidth(width());
+			newScrollHeight -= _aboutProxyPromotion->height();
+		}
 	} else {
 		if (editingMessage() || _canSendMessages) {
 			newScrollHeight -= (_field->height() + 2 * st::historySendPadding);
@@ -6663,6 +6700,9 @@ void HistoryWidget::paintEvent(QPaintEvent *e) {
 		} else if (isRestrictedWrite()) {
 			drawRestrictedWrite(p);
 		}
+		if (_aboutProxyPromotion) {
+			p.fillRect(_aboutProxyPromotion->geometry(), st::historyReplyBg);
+		}
 		if (_pinnedBar && !_pinnedBar->cancel->isHidden()) {
 			drawPinnedBar(p);
 		}

Telegram/SourceFiles/history/history_widget.h

@@ -461,6 +461,7 @@ private:
 	void setMembersShowAreaActive(bool active);
 	void forwardItems(MessageIdsList &&items);
 	void handleHistoryChange(not_null<const History*> history);
+	void refreshAboutProxyPromotion();
 
 	void highlightMessage(MsgId universalMessageId);
 	void adjustHighlightedMessageToMigrated();
@@ -783,6 +784,7 @@ private:
 	object_ptr<Ui::FlatButton> _botStart;
 	object_ptr<Ui::FlatButton> _joinChannel;
 	object_ptr<Ui::FlatButton> _muteUnmute;
+	object_ptr<Ui::RpWidget> _aboutProxyPromotion = { nullptr };
 	mtpRequestId _unblockRequest = 0;
 	mtpRequestId _reportSpamRequest = 0;
 	object_ptr<Ui::IconButton> _attachToggle;

Telegram/SourceFiles/observer_peer.h

@@ -64,6 +64,7 @@ struct PeerUpdate {
 		ChannelRightsChanged      = (1 << 17),
 		ChannelStickersChanged    = (1 << 18),
 		ChannelPinnedChanged      = (1 << 19),
+		ChannelPromotedChanged    = (1 << 20),
 	};
 	using Flags = base::flags<Flag>;
 	friend inline constexpr auto is_flag_type(Flag) { return true; }