Show "View as Messages" preview by Alt+Click.

Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp

@@ -1495,6 +1495,8 @@ RowDescriptor InnerWidget::computeChatPreviewRow() const {
 			: 0;
 		if (const auto topic = peer->forumTopicFor(topicId)) {
 			return { topic, FullMsgId() };
+		} else if (peer->isForum() && !result.key.topic()) {
+			return {};
 		}
 	}
 	return { result.key, result.message.fullId };

Telegram/SourceFiles/history/view/history_view_chat_preview.cpp

@@ -22,6 +22,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_list_widget.h"
 #include "history/history.h"
 #include "history/history_item.h"
+#include "history/history_item_components.h"
 #include "info/profile/info_profile_cover.h"
 #include "info/profile/info_profile_values.h"
 #include "lang/lang_keys.h"
@@ -369,7 +370,10 @@ void Item::setupMarkRead() {
 	) | rpl::start_with_next([=] {
 		const auto state = _thread->chatListBadgesState();
 		const auto unread = (state.unreadCounter || state.unread);
-		if (_thread->asTopic() && !unread) {
+		const auto hidden = _thread->asTopic()
+			? (!unread)
+			: _thread->peer()->isForum();
+		if (hidden) {
 			_markRead->hide();
 			return;
 		}
@@ -595,7 +599,11 @@ void Item::listUpdateDateLink(
 }
 
 bool Item::listElementHideReply(not_null<const Element*> view) {
-	return false;
+	if (!view->isTopicRootReply()) {
+		return false;
+	}
+	const auto reply = view->data()->Get<HistoryMessageReply>();
+	return reply && !reply->fields().manualQuote;
 }
 
 bool Item::listElementShownUnread(not_null<const Element*> view) {
@@ -769,10 +777,6 @@ ChatPreview MakeChatPreview(
 	const auto thread = entry->asThread();
 	if (!thread) {
 		return {};
-	} else if (const auto history = entry->asHistory()) {
-		if (history->peer->isForum()) {
-			return {};
-		}
 	}
 
 	auto result = ChatPreview{

Telegram/SourceFiles/history/view/history_view_message.cpp

@@ -1042,7 +1042,9 @@ QSize Message::performCountOptimalSize() {
 
 void Message::refreshTopicButton() {
 	const auto item = data();
-	if (isAttachedToPrevious() || context() != Context::History) {
+	if (isAttachedToPrevious()
+		|| (context() != Context::History
+			&& context() != Context::ChatPreview)) {
 		_topicButton = nullptr;
 	} else if (const auto topic = item->topic()) {
 		if (!_topicButton) {

Telegram/SourceFiles/window/window_chat_preview.cpp

@@ -33,16 +33,21 @@ ChatPreviewManager::ChatPreviewManager(
 
 bool ChatPreviewManager::show(
 		Dialogs::RowDescriptor row,
-		Fn<void(bool shown)> callback) {
+		Fn<void(bool shown)> callback,
+		QPointer<QWidget> parentOverride) {
 	cancelScheduled();
 	_topicLifetime.destroy();
 	if (const auto topic = row.key.topic()) {
 		_topicLifetime = topic->destroyed() | rpl::start_with_next([=] {
 			_menu = nullptr;
 		});
+	} else if (!row.key) {
+		return false;
 	}
 
-	const auto parent = _controller->content();
+	const auto parent = parentOverride
+		? parentOverride
+		: _controller->content();
 	auto preview = HistoryView::MakeChatPreview(parent, row.key.entry());
 	if (!preview.menu) {
 		return false;
@@ -81,10 +86,14 @@ bool ChatPreviewManager::show(
 	}, _menu->lifetime());
 	QObject::connect(_menu.get(), &QObject::destroyed, [=] {
 		_topicLifetime.destroy();
-		callback(false);
+		if (callback) {
+			callback(false);
+		}
 	});
 
-	callback(true);
+	if (callback) {
+		callback(true);
+	}
 	_menu->popup(QCursor::pos());
 
 	return true;
@@ -92,7 +101,8 @@ bool ChatPreviewManager::show(
 
 bool ChatPreviewManager::schedule(
 		Dialogs::RowDescriptor row,
-		Fn<void(bool shown)> callback) {
+		Fn<void(bool shown)> callback,
+		QPointer<QWidget> parentOverride) {
 	cancelScheduled();
 	_topicLifetime.destroy();
 	if (const auto topic = row.key.topic()) {
@@ -100,15 +110,12 @@ bool ChatPreviewManager::schedule(
 			cancelScheduled();
 			_menu = nullptr;
 		});
-	} else if (const auto history = row.key.history()) {
-		if (history->peer->isForum()) {
-			return false;
-		}
 	} else {
 		return false;
 	}
-	_scheduled = row;
+	_scheduled = std::move(row);
 	_scheduledCallback = std::move(callback);
+	_scheduledParentOverride = std::move(parentOverride);
 	_timer.callOnce(kChatPreviewDelay);
 	return true;
 }

Telegram/SourceFiles/window/window_chat_preview.h

@@ -25,10 +25,12 @@ public:
 
 	bool show(
 		Dialogs::RowDescriptor row,
-		Fn<void(bool shown)> callback = nullptr);
+		Fn<void(bool shown)> callback = nullptr,
+		QPointer<QWidget> parentOverride = nullptr);
 	bool schedule(
 		Dialogs::RowDescriptor row,
-		Fn<void(bool shown)> callback = nullptr);
+		Fn<void(bool shown)> callback = nullptr,
+		QPointer<QWidget> parentOverride = nullptr);
 	void cancelScheduled();
 
 private:
@@ -37,6 +39,7 @@ private:
 	const not_null<SessionController*> _controller;
 	Dialogs::RowDescriptor _scheduled;
 	Fn<void(bool)> _scheduledCallback;
+	QPointer<QWidget> _scheduledParentOverride;
 	base::Timer _timer;
 
 	rpl::lifetime _topicLifetime;

Telegram/SourceFiles/window/window_peer_menu.cpp

@@ -20,6 +20,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "base/random.h"
 #include "base/options.h"
 #include "base/unixtime.h"
+#include "base/qt/qt_key_modifiers.h"
 #include "boxes/delete_messages_box.h"
 #include "boxes/max_invite_box.h"
 #include "boxes/moderate_messages_box.h"
@@ -94,7 +95,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "styles/style_menu_icons.h"
 
 #include <QAction>
-#include <QtGui/QGuiApplication>
+#include <QtWidgets/QApplication>
 
 namespace Window {
 namespace {
@@ -1239,12 +1240,36 @@ void Filler::addViewAsMessages() {
 	}
 	const auto peer = _peer;
 	const auto controller = _controller;
-	_addAction(tr::lng_forum_view_as_messages(tr::now), [=] {
+	const auto parentHideRequests = std::make_shared<rpl::event_stream<>>();
+	const auto filterOutChatPreview = [=] {
+		if (base::IsAltPressed()) {
+			const auto callback = [=](bool shown) {
+				if (!shown) {
+					parentHideRequests->fire({});
+				}
+			};
+			controller->showChatPreview({
+				peer->owner().history(peer),
+				FullMsgId(),
+			}, callback, QApplication::activePopupWidget());
+			return true;
+		}
+		return false;
+	};
+	const auto open = [=] {
 		if (const auto forum = peer->forum()) {
 			peer->owner().saveViewAsMessages(forum, true);
 		}
 		controller->showPeerHistory(peer->id);
-	}, &st::menuIconAsMessages);
+	};
+	auto to_instant = rpl::map_to(anim::type::instant);
+	_addAction({
+		.text = tr::lng_forum_view_as_messages(tr::now),
+		.handler = open,
+		.icon = &st::menuIconAsMessages,
+		.triggerFilter = filterOutChatPreview,
+		.hideRequests = parentHideRequests->events() | to_instant
+	});
 }
 
 void Filler::addViewAsTopics() {

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -2978,16 +2978,22 @@ QString SessionController::premiumRef() const {
 
 bool SessionController::showChatPreview(
 		Dialogs::RowDescriptor row,
-		Fn<void(bool shown)> callback) {
+		Fn<void(bool shown)> callback,
-	return _chatPreviewManager->show(std::move(row), std::move(callback));
+		QPointer<QWidget> parentOverride) {
+	return _chatPreviewManager->show(
+		std::move(row),
+		std::move(callback),
+		std::move(parentOverride));
 }
 
 bool SessionController::scheduleChatPreview(
 		Dialogs::RowDescriptor row,
-		Fn<void(bool shown)> callback) {
+		Fn<void(bool shown)> callback,
+		QPointer<QWidget> parentOverride) {
 	return _chatPreviewManager->schedule(
 		std::move(row),
-		std::move(callback));
+		std::move(callback),
+		std::move(parentOverride));
 }
 
 void SessionController::cancelScheduledPreview() {

Telegram/SourceFiles/window/window_session_controller.h

@@ -603,10 +603,12 @@ public:
 
 	bool showChatPreview(
 		Dialogs::RowDescriptor row,
-		Fn<void(bool shown)> callback = nullptr);
+		Fn<void(bool shown)> callback = nullptr,
+		QPointer<QWidget> parentOverride = nullptr);
 	bool scheduleChatPreview(
 		Dialogs::RowDescriptor row,
-		Fn<void(bool shown)> callback = nullptr);
+		Fn<void(bool shown)> callback = nullptr,
+		QPointer<QWidget> parentOverride = nullptr);
 	void cancelScheduledPreview();
 
 	[[nodiscard]] bool contentOverlapped(QWidget *w, QPaintEvent *e) const;

Telegram/lib_ui

@@ -1 +1 @@
-Subproject commit 33aac93b160d4cd30119c8859de722e28512902b
+Subproject commit d0514b2b022043b3777b06d6068232aa4cda7e80