Highlight reply quote in original message.

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp

@@ -579,11 +579,6 @@ bool InnerWidget::elementUnderCursor(
 	return (Element::Hovered() == view);
 }
 
-float64 InnerWidget::elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const {
-	return 0.;
-}
-
 bool InnerWidget::elementInSelectionMode() {
 	return false;
 }

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.h

@@ -93,8 +93,6 @@ public:
 	HistoryView::Context elementContext() override;
 	bool elementUnderCursor(
 		not_null<const HistoryView::Element*> view) override;
-	[[nodiscard]] float64 elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const override;
 	bool elementInSelectionMode() override;
 	bool elementIntersectsRange(
 		not_null<const HistoryView::Element*> view,

Telegram/SourceFiles/history/history_inner_widget.cpp

@@ -202,10 +202,6 @@ public:
 			not_null<const Element*> view) override {
 		return (Element::Moused() == view);
 	}
-	[[nodiscard]] float64 elementHighlightOpacity(
-			not_null<const HistoryItem*> item) const override {
-		return _widget ? _widget->elementHighlightOpacity(item) : 0.;
-	}
 	bool elementInSelectionMode() override {
 		return _widget ? _widget->inSelectionMode() : false;
 	}
@@ -1060,6 +1056,7 @@ void HistoryInner::paintEvent(QPaintEvent *e) {
 	auto clip = e->rect();
 
 	auto context = preparePaintContext(clip);
+	context.highlightPathCache = &_highlightPathCache;
 	_pathGradient->startFrame(
 		0,
 		width(),
@@ -1143,7 +1140,7 @@ void HistoryInner::paintEvent(QPaintEvent *e) {
 			} else if (item->isUnreadMention()
 				&& !item->isUnreadMedia()) {
 				readContents.insert(item);
-				_widget->enqueueMessageHighlight(view);
+				_widget->enqueueMessageHighlight(view, {});
 			}
 		}
 		session().data().reactions().poll(item, context.now);
@@ -1185,6 +1182,7 @@ void HistoryInner::paintEvent(QPaintEvent *e) {
 				view,
 				selfromy - mtop,
 				seltoy - mtop);
+			context.highlight = _widget->itemHighlight(view->data());
 			view->draw(p, context);
 			processPainted(view, top, height);
 
@@ -1219,9 +1217,10 @@ void HistoryInner::paintEvent(QPaintEvent *e) {
 		const auto &sendingAnimation = _controller->sendingAnimation();
 		while (top < drawToY) {
 			const auto height = view->height();
+			const auto item = view->data();
 			if ((context.clip.y() < height)
 				&& (hdrawtop < top + height)
-				&& !sendingAnimation.hasAnimatedMessage(view->data())) {
+				&& !sendingAnimation.hasAnimatedMessage(item)) {
 				context.reactionInfo
 					= _reactionsManager->currentReactionPaintInfo();
 				context.outbg = view->hasOutLayout();
@@ -1229,6 +1228,7 @@ void HistoryInner::paintEvent(QPaintEvent *e) {
 					view,
 					selfromy - htop,
 					seltoy - htop);
+				context.highlight = _widget->itemHighlight(item);
 				view->draw(p, context);
 				processPainted(view, top, height);
 			}
@@ -2410,6 +2410,9 @@ void HistoryInner::showContextMenu(QContextMenuEvent *e, bool showFromTouch) {
 			_menu->addAction(text, [=] {
 				if (canSendReply) {
 					_widget->replyToMessage({ itemId, quote });
+					if (!quote.empty()) {
+						_widget->clearSelected();
+					}
 				} else {
 					HistoryView::Controls::ShowReplyToChatBox(
 						controller->uiShow(),
@@ -3474,11 +3477,6 @@ void HistoryInner::elementStartStickerLoop(
 	_animatedStickersPlayed.emplace(view->data());
 }
 
-float64 HistoryInner::elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const {
-	return _widget->highlightOpacity(item);
-}
-
 void HistoryInner::elementShowPollResults(
 		not_null<PollData*> poll,
 		FullMsgId context) {

Telegram/SourceFiles/history/history_inner_widget.h

@@ -15,6 +15,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/scroll_area.h"
 #include "history/view/history_view_top_bar_widget.h"
 
+#include <QtGui/QPainterPath>
+
 struct ClickContext;
 struct ClickHandlerContext;
 
@@ -136,8 +138,6 @@ public:
 		int from,
 		int till) const;
 	void elementStartStickerLoop(not_null<const Element*> view);
-	[[nodiscard]] float64 elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const;
 	void elementShowPollResults(
 		not_null<PollData*> poll,
 		FullMsgId context);
@@ -462,6 +462,7 @@ private:
 	std::optional<Ui::ReportReason> _chooseForReportReason;
 
 	const std::unique_ptr<Ui::PathShiftGradient> _pathGradient;
+	QPainterPath _highlightPathCache;
 	bool _isChatWide = false;
 
 	base::flat_set<not_null<const HistoryItem*>> _animatedStickersPlayed;

Telegram/SourceFiles/history/history_item_components.cpp

@@ -630,7 +630,10 @@ void HistoryMessageReply::setLinkFrom(
 		}
 	};
 	_link = resolvedMessage
-		? JumpToMessageClickHandler(resolvedMessage.get(), holder->fullId())
+		? JumpToMessageClickHandler(
+			resolvedMessage.get(),
+			holder->fullId(),
+			_fields.quote)
 		: resolvedStory
 		? JumpToStoryClickHandler(resolvedStory.get())
 		: (external && !_fields.messageId)

Telegram/SourceFiles/history/history_item_helpers.cpp

@@ -259,17 +259,20 @@ bool IsItemScheduledUntilOnline(not_null<const HistoryItem*> item) {
 
 ClickHandlerPtr JumpToMessageClickHandler(
 		not_null<HistoryItem*> item,
-		FullMsgId returnToId) {
+		FullMsgId returnToId,
+		TextWithEntities highlightPart) {
 	return JumpToMessageClickHandler(
 		item->history()->peer,
 		item->id,
-		returnToId);
+		returnToId,
+		std::move(highlightPart));
 }
 
 ClickHandlerPtr JumpToMessageClickHandler(
 		not_null<PeerData*> peer,
 		MsgId msgId,
-		FullMsgId returnToId) {
+		FullMsgId returnToId,
+		TextWithEntities highlightPart) {
 	return std::make_shared<LambdaClickHandler>([=] {
 		const auto separate = Core::App().separateWindowForPeer(peer);
 		const auto controller = separate
@@ -279,6 +282,7 @@ ClickHandlerPtr JumpToMessageClickHandler(
 			auto params = Window::SectionShow{
 				Window::SectionShow::Way::Forward
 			};
+			params.highlightPart = highlightPart;
 			params.origin = Window::SectionShow::OriginMessage{
 				returnToId
 			};

Telegram/SourceFiles/history/history_item_helpers.h

@@ -120,10 +120,12 @@ struct SendingErrorRequest {
 [[nodiscard]] ClickHandlerPtr JumpToMessageClickHandler(
 	not_null<PeerData*> peer,
 	MsgId msgId,
-	FullMsgId returnToId = FullMsgId());
+	FullMsgId returnToId = FullMsgId(),
+	TextWithEntities highlightPart = {});
 [[nodiscard]] ClickHandlerPtr JumpToMessageClickHandler(
 	not_null<HistoryItem*> item,
-	FullMsgId returnToId = FullMsgId());
+	FullMsgId returnToId = FullMsgId(),
+	TextWithEntities highlightPart = {});
 [[nodiscard]] ClickHandlerPtr JumpToStoryClickHandler(
 	not_null<Data::Story*> story);
 ClickHandlerPtr JumpToStoryClickHandler(

Telegram/SourceFiles/history/history_view_highlight_manager.cpp

@@ -10,12 +10,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_session.h"
 #include "history/history_item.h"
 #include "history/view/history_view_element.h"
+#include "ui/chat/chat_style.h"
 
 namespace HistoryView {
 
-constexpr auto kAnimationFirstPart = st::activeFadeInDuration
-	/ float64(st::activeFadeInDuration + st::activeFadeOutDuration);
-
 ElementHighlighter::ElementHighlighter(
 	not_null<Data::Session*> data,
 	ViewForItem viewForItem,
@@ -26,14 +24,15 @@ ElementHighlighter::ElementHighlighter(
 , _animation(*this) {
 }
 
-void ElementHighlighter::enqueue(not_null<Element*> view) {
+void ElementHighlighter::enqueue(
+		not_null<Element*> view,
+		TextSelection part) {
 	const auto item = view->data();
-	const auto fullId = item->fullId();
+	const auto data = Highlight{ item->fullId(), part };
 	if (_queue.empty() && !_animation.animating()) {
-		highlight(fullId);
-	} else if (_highlightedMessageId != fullId
-		&& !base::contains(_queue, fullId)) {
-		_queue.push_back(fullId);
+		highlight(data.itemId, data.part);
+	} else if (_highlighted != data && !base::contains(_queue, data)) {
+		_queue.push_back(data);
 		checkNextHighlight();
 	}
 }
@@ -42,47 +41,46 @@ void ElementHighlighter::checkNextHighlight() {
 	if (_animation.animating()) {
 		return;
 	}
-	const auto nextHighlight = [&] {
+	const auto next = [&] {
 		while (!_queue.empty()) {
-			const auto fullId = _queue.front();
+			const auto highlight = _queue.front();
 			_queue.pop_front();
-			if (const auto item = _data->message(fullId)) {
+			if (const auto item = _data->message(highlight.itemId)) {
 				if (_viewForItem(item)) {
-					return fullId;
+					return highlight;
 				}
 			}
 		}
-		return FullMsgId();
+		return Highlight();
 	}();
-	if (!nextHighlight) {
+	if (!next) {
 		return;
 	}
-	highlight(nextHighlight);
+	highlight(next.itemId, next.part);
 }
 
-float64 ElementHighlighter::progress(
+Ui::ChatPaintHighlight ElementHighlighter::state(
 		not_null<const HistoryItem*> item) const {
-	if (item->fullId() == _highlightedMessageId) {
-		const auto progress = _animation.progress();
-		return std::min(progress / kAnimationFirstPart, 1.)
-			- ((progress - kAnimationFirstPart) / (1. - kAnimationFirstPart));
+	if (item->fullId() == _highlighted.itemId) {
+		auto result = _animation.state();
+		result.range = _highlighted.part;
+		return result;
 	}
-	return 0.;
+	return {};
 }
 
-void ElementHighlighter::highlight(FullMsgId itemId) {
+void ElementHighlighter::highlight(FullMsgId itemId, TextSelection part) {
 	if (const auto item = _data->message(itemId)) {
 		if (const auto view = _viewForItem(item)) {
-			if (_highlightedMessageId
-				&& _highlightedMessageId != itemId) {
-				if (const auto was = _data->message(_highlightedMessageId)) {
+			if (_highlighted && _highlighted.itemId != itemId) {
+				if (const auto was = _data->message(_highlighted.itemId)) {
 					if (const auto view = _viewForItem(was)) {
 						repaintHighlightedItem(view);
 					}
 				}
 			}
-			_highlightedMessageId = itemId;
-			_animation.start();
+			_highlighted = { itemId, part };
+			_animation.start(!part.empty());
 
 			repaintHighlightedItem(view);
 		}
@@ -105,7 +103,7 @@ void ElementHighlighter::repaintHighlightedItem(
 }
 
 void ElementHighlighter::updateMessage() {
-	if (const auto item = _data->message(_highlightedMessageId)) {
+	if (const auto item = _data->message(_highlighted.itemId)) {
 		if (const auto view = _viewForItem(item)) {
 			repaintHighlightedItem(view);
 		}
@@ -114,7 +112,7 @@ void ElementHighlighter::updateMessage() {
 
 void ElementHighlighter::clear() {
 	_animation.cancel();
-	_highlightedMessageId = FullMsgId();
+	_highlighted = {};
 	_lastHighlightedMessageId = FullMsgId();
 	_queue.clear();
 }
@@ -125,60 +123,117 @@ ElementHighlighter::AnimationManager::AnimationManager(
 }
 
 bool ElementHighlighter::AnimationManager::animating() const {
-	if (anim::Disabled()) {
-		return (_timer && _timer->isActive());
-	} else {
+	if (_timer && _timer->isActive()) {
+		return true;
+	} else if (!anim::Disabled()) {
 		return _simple.animating();
 	}
+	return false;
 }
 
-float64 ElementHighlighter::AnimationManager::progress() const {
+Ui::ChatPaintHighlight ElementHighlighter::AnimationManager::state() const {
 	if (anim::Disabled()) {
-		return (_timer && _timer->isActive()) ? kAnimationFirstPart : 0.;
-	} else {
-		return _simple.value(0.);
+		return {
+			.opacity = !_timer ? 0. : 1.,
+			.collapsion = !_timer ? 0. : _fadingOut ? 1. : 0.,
+		};
 	}
+	return {
+		.opacity = ((!_fadingOut && _collapsing)
+			? 1.
+			: _simple.value(_fadingOut ? 0. : 1.)),
+		.collapsion = ((!_withTextPart || !_collapsing)
+			? 0.
+			: _fadingOut
+			? 1.
+			: _simple.value(1.)),
+	};
 }
 
 MsgId ElementHighlighter::latestSingleHighlightedMsgId() const {
-	return _highlightedMessageId
-		? _highlightedMessageId.msg
+	return _highlighted.itemId
+		? _highlighted.itemId.msg
 		: _lastHighlightedMessageId.msg;
 }
 
-void ElementHighlighter::AnimationManager::start() {
+void ElementHighlighter::AnimationManager::start(bool withTextPart) {
+	_withTextPart = withTextPart;
 	const auto finish = [=] {
 		cancel();
 		_parent._lastHighlightedMessageId = base::take(
-			_parent._highlightedMessageId);
+			_parent._highlighted.itemId);
 		_parent.checkNextHighlight();
 	};
 	cancel();
 	if (anim::Disabled()) {
 		_timer.emplace([=] {
 			_parent.updateMessage();
-			finish();
+			if (_withTextPart && !_fadingOut) {
+				_fadingOut = true;
+				_timer->callOnce(st::activeFadeOutDuration);
+			} else {
+				finish();
+			}
 		});
-		_timer->callOnce(st::activeFadeOutDuration);
+		_timer->callOnce(_withTextPart
+			? st::activeFadeInDuration
+			: st::activeFadeOutDuration);
 		_parent.updateMessage();
 	} else {
-		const auto to = 1.;
 		_simple.start(
 			[=](float64 value) {
 				_parent.updateMessage();
-				if (value == to) {
-					finish();
+				if (value == 1.) {
+					if (_withTextPart) {
+						_timer.emplace([=] {
+							_parent.updateMessage();
+							if (_collapsing) {
+								_fadingOut = true;
+							} else {
+								_collapsing = true;
+							}
+							_simple.start([=](float64 value) {
+								_parent.updateMessage();
+								if (_fadingOut && value == 0.) {
+									finish();
+								} else if (!_fadingOut && value == 1.) {
+									_timer->callOnce(
+										st::activeFadeOutDuration);
+								}
+							},
+							_fadingOut ? 1. : 0.,
+							_fadingOut ? 0. : 1.,
+							(_fadingOut
+								? st::activeFadeInDuration
+								: st::fadeWrapDuration));
+						});
+						_timer->callOnce(st::activeFadeInDuration);
+					} else {
+						_fadingOut = true;
+						_simple.start([=](float64 value) {
+							_parent.updateMessage();
+							if (value == 0.) {
+								finish();
+							}
+						},
+						1.,
+						0.,
+						st::activeFadeOutDuration);
+					}
 				}
 			},
 			0.,
-			to,
-			st::activeFadeInDuration + st::activeFadeOutDuration);
+			1.,
+			st::activeFadeInDuration);
 	}
 }
 
 void ElementHighlighter::AnimationManager::cancel() {
 	_simple.stop();
 	_timer.reset();
+	_fadingOut = false;
+	_collapsed = false;
+	_collapsing = false;
 }
 
 } // namespace HistoryView

Telegram/SourceFiles/history/history_view_highlight_manager.h

@@ -16,6 +16,10 @@ namespace Data {
 class Session;
 } // namespace Data
 
+namespace Ui {
+struct ChatPaintHighlight;
+} // namespace Ui
+
 namespace HistoryView {
 
 class Element;
@@ -29,40 +33,56 @@ public:
 		ViewForItem viewForItem,
 		RepaintView repaintView);
 
-	void enqueue(not_null<Element*> view);
-	void highlight(FullMsgId itemId);
+	void enqueue(not_null<Element*> view, TextSelection part);
+	void highlight(FullMsgId itemId, TextSelection part);
 	void clear();
 
-	[[nodiscard]] float64 progress(not_null<const HistoryItem*> item) const;
+	[[nodiscard]] Ui::ChatPaintHighlight state(
+		not_null<const HistoryItem*> item) const;
 	[[nodiscard]] MsgId latestSingleHighlightedMsgId() const;
 
 private:
-	void checkNextHighlight();
-	void repaintHighlightedItem(not_null<const Element*> view);
-	void updateMessage();
-
 	class AnimationManager final {
 	public:
 		AnimationManager(ElementHighlighter &parent);
 		[[nodiscard]] bool animating() const;
-		[[nodiscard]] float64 progress() const;
-		void start();
+		[[nodiscard]] Ui::ChatPaintHighlight state() const;
+		void start(bool withTextPart);
 		void cancel();
 
 	private:
 		ElementHighlighter &_parent;
 		Ui::Animations::Simple _simple;
 		std::optional<base::Timer> _timer;
+		bool _withTextPart = false;
+		bool _collapsing = false;
+		bool _collapsed = false;
+		bool _fadingOut = false;
 
 	};
 
+	struct Highlight {
+		FullMsgId itemId;
+		TextSelection part;
+
+		explicit operator bool() const {
+			return itemId.operator bool();
+		}
+		friend inline auto operator<=>(Highlight, Highlight) = default;
+		friend inline bool operator==(Highlight, Highlight) = default;
+	};
+
+	void checkNextHighlight();
+	void repaintHighlightedItem(not_null<const Element*> view);
+	void updateMessage();
+
 	const not_null<Data::Session*> _data;
 	const ViewForItem _viewForItem;
 	const RepaintView _repaintView;
 
-	FullMsgId _highlightedMessageId;
+	Highlight _highlighted;
 	FullMsgId _lastHighlightedMessageId;
-	std::deque<FullMsgId> _queue;
+	std::deque<Highlight> _queue;
 
 	AnimationManager _animation;
 

Telegram/SourceFiles/history/history_widget.cpp

@@ -1072,7 +1072,7 @@ void HistoryWidget::initTabbedSelector() {
 		if (!data.recipientOverride) {
 			return true;
 		} else if (data.recipientOverride != _peer) {
-			showHistory(data.recipientOverride->id, ShowAtTheEndMsgId);
+			showHistory(data.recipientOverride->id, ShowAtTheEndMsgId, {});
 		}
 		return (data.recipientOverride == _peer);
 	}) | rpl::start_with_next([=](ChatHelpers::InlineChosen data) {
@@ -1267,13 +1267,14 @@ void HistoryWidget::scrollToAnimationCallback(
 }
 
 void HistoryWidget::enqueueMessageHighlight(
-		not_null<HistoryView::Element*> view) {
-	_highlighter.enqueue(view);
+		not_null<HistoryView::Element*> view,
+		TextSelection part) {
+	_highlighter.enqueue(view, part);
 }
 
-float64 HistoryWidget::highlightOpacity(
+Ui::ChatPaintHighlight HistoryWidget::itemHighlight(
 		not_null<const HistoryItem*> item) const {
-	return _highlighter.progress(item);
+	return _highlighter.state(item);
 }
 
 int HistoryWidget::itemTopForHighlight(
@@ -1971,9 +1972,10 @@ bool HistoryWidget::insideJumpToEndInsteadOfToUnread() const {
 void HistoryWidget::showHistory(
 		const PeerId &peerId,
 		MsgId showAtMsgId,
-		bool reload) {
+		const TextWithEntities &highlightPart) {
 	_pinnedClickedId = FullMsgId();
 	_minPinnedId = std::nullopt;
+	_showAtMsgHighlightPart = {};
 
 	const auto wasDialogsEntryState = computeDialogsEntryState();
 	const auto startBot = (showAtMsgId == ShowAndStartBotMsgId);
@@ -1985,7 +1987,7 @@ void HistoryWidget::showHistory(
 	controller()->sendingAnimation().clear();
 	_topToast.hide(anim::type::instant);
 	if (_history) {
-		if (_peer->id == peerId && !reload) {
+		if (_peer->id == peerId) {
 			updateForwarding();
 
 			if (showAtMsgId == ShowAtUnreadMsgId
@@ -2021,10 +2023,10 @@ void HistoryWidget::showHistory(
 						).arg(_history->inboxReadTillId().bare
 						).arg(Logs::b(_history->loadedAtBottom())
 						).arg(showAtMsgId.bare));
-					delayedShowAt(showAtMsgId);
+					delayedShowAt(showAtMsgId, highlightPart);
 				} else if (_showAtMsgId != showAtMsgId) {
 					clearAllLoadRequests();
-					setMsgId(showAtMsgId);
+					setMsgId(showAtMsgId, highlightPart);
 					firstLoadMessages();
 					doneShow();
 				}
@@ -2044,7 +2046,7 @@ void HistoryWidget::showHistory(
 					_cornerButtons.skipReplyReturn(skipId);
 				}
 
-				setMsgId(showAtMsgId);
+				setMsgId(showAtMsgId, highlightPart);
 				if (_historyInited) {
 					DEBUG_LOG(("JumpToEnd(%1, %2, %3): "
 						"Showing instant at %4."
@@ -2147,6 +2149,7 @@ void HistoryWidget::showHistory(
 	clearInlineBot();
 
 	_showAtMsgId = showAtMsgId;
+	_showAtMsgHighlightPart = highlightPart;
 	_historyInited = false;
 	_contactStatus = nullptr;
 
@@ -3301,7 +3304,7 @@ void HistoryWidget::messagesReceived(
 		}
 
 		_delayedShowAtRequest = 0;
-		setMsgId(_delayedShowAtMsgId);
+		setMsgId(_delayedShowAtMsgId, _delayedShowAtMsgHighlightPart);
 		historyLoaded();
 	}
 	if (session().supportMode()) {
@@ -3523,9 +3526,16 @@ void HistoryWidget::loadMessagesDown() {
 	});
 }
 
-void HistoryWidget::delayedShowAt(MsgId showAtMsgId) {
-	if (!_history
-		|| (_delayedShowAtRequest && _delayedShowAtMsgId == showAtMsgId)) {
+void HistoryWidget::delayedShowAt(
+		MsgId showAtMsgId,
+		const TextWithEntities &highlightPart) {
+	if (!_history) {
+		return;
+	}
+	if (_delayedShowAtMsgHighlightPart != highlightPart) {
+		_delayedShowAtMsgHighlightPart = highlightPart;
+	}
+	if (_delayedShowAtRequest && _delayedShowAtMsgId == showAtMsgId) {
 		return;
 	}
 
@@ -4102,7 +4112,12 @@ PeerData *HistoryWidget::peer() const {
 }
 
 // Sometimes _showAtMsgId is set directly.
-void HistoryWidget::setMsgId(MsgId showAtMsgId) {
+void HistoryWidget::setMsgId(
+		MsgId showAtMsgId,
+		const TextWithEntities &highlightPart) {
+	if (_showAtMsgHighlightPart != highlightPart) {
+		_showAtMsgHighlightPart = highlightPart;
+	}
 	if (_showAtMsgId != showAtMsgId) {
 		_showAtMsgId = showAtMsgId;
 		if (_history) {
@@ -4223,11 +4238,11 @@ void HistoryWidget::cornerButtonsShowAtPosition(
 			).arg(_history->peer->name()
 			).arg(_history->inboxReadTillId().bare
 			).arg(Logs::b(_history->loadedAtBottom())));
-		showHistory(_peer->id, ShowAtUnreadMsgId);
+		showHistory(_peer->id, ShowAtUnreadMsgId, {});
 	} else if (_peer && position.fullId.peer == _peer->id) {
-		showHistory(_peer->id, position.fullId.msg);
+		showHistory(_peer->id, position.fullId.msg, {});
 	} else if (_migrated && position.fullId.peer == _migrated->peer->id) {
-		showHistory(_peer->id, -position.fullId.msg);
+		showHistory(_peer->id, -position.fullId.msg, {});
 	}
 }
 
@@ -5678,14 +5693,17 @@ int HistoryWidget::countInitialScrollTop() {
 		const auto item = getItemFromHistoryOrMigrated(_showAtMsgId);
 		const auto itemTop = _list->itemTop(item);
 		if (itemTop < 0) {
-			setMsgId(0);
+			setMsgId(ShowAtUnreadMsgId);
 			controller()->showToast(tr::lng_message_not_found(tr::now));
 			return countInitialScrollTop();
 		} else {
 			const auto view = item->mainView();
 			Assert(view != nullptr);
 
-			enqueueMessageHighlight(view);
+			enqueueMessageHighlight(
+				view,
+				view->selectionFromQuote(
+					base::take(_showAtMsgHighlightPart)));
 			const auto result = itemTopForHighlight(view);
 			createUnreadBarIfBelowVisibleArea(result);
 			return result;
@@ -6377,7 +6395,8 @@ void HistoryWidget::handlePeerMigration() {
 	if (_peer != channel) {
 		showHistory(
 			channel->id,
-			(_showAtMsgId > 0) ? (-_showAtMsgId) : _showAtMsgId);
+			(_showAtMsgId > 0) ? (-_showAtMsgId) : _showAtMsgId,
+			{});
 		channel->session().api().chatParticipants().requestCountDelayed(
 			channel);
 	} else {
@@ -6473,7 +6492,7 @@ bool HistoryWidget::showSlowmodeError() {
 			if (const auto item = _history->latestSendingMessage()) {
 				if (const auto view = item->mainView()) {
 					animatedScrollToItem(item->id);
-					enqueueMessageHighlight(view);
+					enqueueMessageHighlight(view, {});
 				}
 				return tr::lng_slowmode_no_many(tr::now);
 			}

Telegram/SourceFiles/history/history_widget.h

@@ -75,6 +75,7 @@ class SpoilerAnimation;
 enum class ReportReason;
 class ChooseThemeController;
 class ContinuousScroll;
+struct ChatPaintHighlight;
 } // namespace Ui
 
 namespace Window {
@@ -146,7 +147,9 @@ public:
 	void loadMessages();
 	void loadMessagesDown();
 	void firstLoadMessages();
-	void delayedShowAt(MsgId showAtMsgId);
+	void delayedShowAt(
+		MsgId showAtMsgId,
+		const TextWithEntities &highlightPart);
 
 	bool updateReplaceMediaButton();
 	void updateFieldPlaceholder();
@@ -160,7 +163,9 @@ public:
 
 	History *history() const;
 	PeerData *peer() const;
-	void setMsgId(MsgId showAtMsgId);
+	void setMsgId(
+		MsgId showAtMsgId,
+		const TextWithEntities &highlightPart = {});
 	MsgId msgId() const;
 
 	bool hasTopBarShadow() const {
@@ -177,8 +182,10 @@ public:
 
 	bool touchScroll(const QPoint &delta);
 
-	void enqueueMessageHighlight(not_null<HistoryView::Element*> view);
-	[[nodiscard]] float64 highlightOpacity(
+	void enqueueMessageHighlight(
+		not_null<HistoryView::Element*> view,
+		TextSelection part);
+	[[nodiscard]] Ui::ChatPaintHighlight itemHighlight(
 		not_null<const HistoryItem*> item) const;
 
 	MessageIdsList getSelectedItems() const;
@@ -218,7 +225,10 @@ public:
 	void fastShowAtEnd(not_null<History*> history);
 	bool applyDraft(
 		FieldHistoryAction fieldHistoryAction = FieldHistoryAction::Clear);
-	void showHistory(const PeerId &peer, MsgId showAtMsgId, bool reload = false);
+	void showHistory(
+		const PeerId &peer,
+		MsgId showAtMsgId,
+		const TextWithEntities &highlightPart);
 	void setChooseReportMessagesDetails(
 		Ui::ReportReason reason,
 		Fn<void(MessageIdsList)> callback);
@@ -684,12 +694,14 @@ private:
 	bool _canSendMessages = false;
 	bool _canSendTexts = false;
 	MsgId _showAtMsgId = ShowAtUnreadMsgId;
+	TextWithEntities _showAtMsgHighlightPart;
 
 	int _firstLoadRequest = 0; // Not real mtpRequestId.
 	int _preloadRequest = 0; // Not real mtpRequestId.
 	int _preloadDownRequest = 0; // Not real mtpRequestId.
 
 	MsgId _delayedShowAtMsgId = -1;
+	TextWithEntities _delayedShowAtMsgHighlightPart;
 	int _delayedShowAtRequest = 0; // Not real mtpRequestId.
 
 	History *_supportPreloadHistory = nullptr;

Telegram/SourceFiles/history/view/history_view_element.cpp

@@ -111,11 +111,6 @@ bool DefaultElementDelegate::elementUnderCursor(
 	return false;
 }
 
-float64 DefaultElementDelegate::elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const {
-	return 0.;
-}
-
 bool DefaultElementDelegate::elementInSelectionMode() {
 	return false;
 }
@@ -605,18 +600,13 @@ void Element::paintCustomHighlight(
 		int y,
 		int height,
 		not_null<const HistoryItem*> item) const {
-	const auto opacity = delegate()->elementHighlightOpacity(item);
+	const auto opacity = context.highlight.opacity;
 	if (opacity == 0.) {
 		return;
 	}
 	const auto o = p.opacity();
 	p.setOpacity(o * opacity);
-	p.fillRect(
-		0,
-		y,
-		width(),
-		height,
-		context.st->msgSelectOverlay());
+	p.fillRect(0, y, width(), height, context.st->msgSelectOverlay());
 	p.setOpacity(o);
 }
 

Telegram/SourceFiles/history/view/history_view_element.h

@@ -69,8 +69,6 @@ class ElementDelegate {
 public:
 	virtual Context elementContext() = 0;
 	virtual bool elementUnderCursor(not_null<const Element*> view) = 0;
-	[[nodiscard]] virtual float64 elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const = 0;
 	virtual bool elementInSelectionMode() = 0;
 	virtual bool elementIntersectsRange(
 		not_null<const Element*> view,
@@ -120,8 +118,6 @@ public:
 class DefaultElementDelegate : public ElementDelegate {
 public:
 	bool elementUnderCursor(not_null<const Element*> view) override;
-	[[nodiscard]] float64 elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const override;
 	bool elementInSelectionMode() override;
 	bool elementIntersectsRange(
 		not_null<const Element*> view,

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -707,8 +707,15 @@ bool ListWidget::isBelowPosition(Data::MessagePosition position) const {
 	return _items.front()->data()->position() > position;
 }
 
-void ListWidget::highlightMessage(FullMsgId itemId) {
-	_highlighter.highlight(itemId);
+void ListWidget::highlightMessage(
+		FullMsgId itemId,
+		const TextWithEntities &highlightPart) {
+	const auto view = !highlightPart.empty()
+		? viewForItem(itemId)
+		: nullptr;
+	_highlighter.highlight(
+		itemId,
+		view ? view->selectionFromQuote(highlightPart) : TextSelection());
 }
 
 void ListWidget::showAroundPosition(
@@ -741,12 +748,12 @@ bool ListWidget::jumpToBottomInsteadOfUnread() const {
 
 void ListWidget::showAtPosition(
 		Data::MessagePosition position,
-		anim::type animated,
+		const Window::SectionShow &params,
 		Fn<void(bool found)> done) {
 	const auto showAtUnread = (position == Data::UnreadMessagePosition);
 
 	if (showAtUnread && jumpToBottomInsteadOfUnread()) {
-		showAtPosition(Data::MaxMessagePosition, animated, std::move(done));
+		showAtPosition(Data::MaxMessagePosition, params, std::move(done));
 		return;
 	}
 
@@ -766,24 +773,24 @@ void ListWidget::showAtPosition(
 				_bar = {};
 			}
 			checkUnreadBarCreation();
-			return showAtPositionNow(position, animated, done);
+			return showAtPositionNow(position, params, done);
 		});
-	} else if (!showAtPositionNow(position, animated, done)) {
+	} else if (!showAtPositionNow(position, params, done)) {
 		showAroundPosition(position, [=] {
-			return showAtPositionNow(position, animated, done);
+			return showAtPositionNow(position, params, done);
 		});
 	}
 }
 
 bool ListWidget::showAtPositionNow(
 		Data::MessagePosition position,
-		anim::type animated,
+		const Window::SectionShow &params,
 		Fn<void(bool found)> done) {
 	if (const auto scrollTop = scrollTopForPosition(position)) {
-		computeScrollTo(*scrollTop, position, animated);
+		computeScrollTo(*scrollTop, position, params.animated);
 		if (position != Data::MaxMessagePosition
 			&& position != Data::UnreadMessagePosition) {
-			highlightMessage(position.fullId);
+			highlightMessage(position.fullId, params.highlightPart);
 		}
 		if (done) {
 			const auto found = !position.fullId.peer
@@ -1655,11 +1662,6 @@ bool ListWidget::elementUnderCursor(
 	return (_overElement == view);
 }
 
-float64 ListWidget::elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const {
-	return _highlighter.progress(item);
-}
-
 bool ListWidget::elementInSelectionMode() {
 	return inSelectionMode();
 }
@@ -2108,6 +2110,7 @@ void ListWidget::paintEvent(QPaintEvent *e) {
 				= _reactionsManager->currentReactionPaintInfo();
 			context.outbg = view->hasOutLayout();
 			context.selection = itemRenderSelection(view);
+			context.highlight = _highlighter.state(item);
 			view->draw(p, context);
 		}
 		if (_translateTracker) {
@@ -2142,7 +2145,7 @@ void ListWidget::paintEvent(QPaintEvent *e) {
 			} else if (item->isUnreadMention()
 				&& !item->isUnreadMedia()) {
 				readContents.insert(item);
-				_highlighter.enqueue(view);
+				_highlighter.enqueue(view, {});
 			}
 		}
 		session->data().reactions().poll(item, context.now);

Telegram/SourceFiles/history/view/history_view_list_widget.h

@@ -48,6 +48,10 @@ struct ChosenReaction;
 struct ButtonParameters;
 } // namespace HistoryView::Reactions
 
+namespace Window {
+struct SectionShow;
+} // namespace Window
+
 namespace HistoryView {
 
 struct TextState;
@@ -227,11 +231,13 @@ public:
 	[[nodiscard]] bool animatedScrolling() const;
 	bool isAbovePosition(Data::MessagePosition position) const;
 	bool isBelowPosition(Data::MessagePosition position) const;
-	void highlightMessage(FullMsgId itemId);
+	void highlightMessage(
+		FullMsgId itemId,
+		const TextWithEntities &highlightPart);
 
 	void showAtPosition(
 		Data::MessagePosition position,
-		anim::type animated = anim::type::normal,
+		const Window::SectionShow &params,
 		Fn<void(bool found)> done = nullptr);
 	void refreshViewer();
 
@@ -292,8 +298,6 @@ public:
 	// ElementDelegate interface.
 	Context elementContext() override;
 	bool elementUnderCursor(not_null<const Element*> view) override;
-	[[nodiscard]] float64 elementHighlightOpacity(
-		not_null<const HistoryItem*> item) const override;
 	bool elementInSelectionMode() override;
 	bool elementIntersectsRange(
 		not_null<const Element*> view,
@@ -430,7 +434,7 @@ private:
 		Fn<bool()> overrideInitialScroll);
 	bool showAtPositionNow(
 		Data::MessagePosition position,
-		anim::type animated,
+		const Window::SectionShow &params,
 		Fn<void(bool found)> done);
 
 	Ui::ChatPaintContext preparePaintContext(const QRect &clip) const;

Telegram/SourceFiles/history/view/history_view_message.cpp

@@ -1018,6 +1018,10 @@ void Message::draw(Painter &p, const PaintContext &context) const {
 		p.translate(-reactionsPosition);
 	}
 
+	if (context.highlightPathCache) {
+		context.highlightInterpolateTo = g;
+		context.highlightPathCache->clear();
+	}
 	if (bubble) {
 		if (displayFromName()
 			&& item->displayFrom()
@@ -1110,6 +1114,7 @@ void Message::draw(Painter &p, const PaintContext &context) const {
 				- (_bottomInfo.height() - st::msgDateFont->height));
 		}
 		auto textSelection = context.selection;
+		auto highlightRange = context.highlight.range;
 		const auto mediaHeight = mediaDisplayed ? media->height() : 0;
 		const auto paintMedia = [&](int top) {
 			if (!mediaDisplayed) {
@@ -1130,6 +1135,10 @@ void Message::draw(Painter &p, const PaintContext &context) const {
 					context.reactionInfo->effectOffset -= add;
 				}
 			}
+			if (context.highlightPathCache
+				&& !context.highlightPathCache->isEmpty()) {
+				context.highlightPathCache->translate(mediaPosition);
+			}
 			p.translate(-mediaPosition);
 		};
 		if (mediaDisplayed && _invertMedia) {
@@ -1141,8 +1150,12 @@ void Message::draw(Painter &p, const PaintContext &context) const {
 				+ mediaHeight
 				+ (mediaOnBottom ? 0 : st::mediaInBubbleSkip));
 			textSelection = media->skipSelection(textSelection);
+			highlightRange = media->skipSelection(highlightRange);
 		}
-		paintText(p, trect, context.withSelection(textSelection));
+		auto copy = context;
+		copy.selection = textSelection;
+		copy.highlight.range = highlightRange;
+		paintText(p, trect, copy);
 		if (mediaDisplayed && !_invertMedia) {
 			paintMedia(trect.y() + trect.height() - mediaHeight);
 			if (context.reactionInfo && !displayInfo && !_reactions) {
@@ -1224,6 +1237,20 @@ void Message::draw(Painter &p, const PaintContext &context) const {
 
 	p.restoreTextPalette();
 
+	if (context.highlightPathCache
+		&& !context.highlightPathCache->isEmpty()) {
+		const auto alpha = int(0.25
+			* context.highlight.collapsion
+			* context.highlight.opacity
+			* 255);
+		if (alpha > 0) {
+			context.highlightPathCache->setFillRule(Qt::WindingFill);
+			auto color = context.messageStyle()->textPalette.linkFg->c;
+			color.setAlpha(alpha);
+			p.fillPath(*context.highlightPathCache, color);
+		}
+	}
+
 	if (roll) {
 		p.restore();
 	}
@@ -1651,6 +1678,7 @@ void Message::paintText(
 			width());
 		trect.setY(trect.y() + botTop->height);
 	}
+	auto highlightRequest = context.computeHighlightCache();
 	text().draw(p, {
 		.position = trect.topLeft(),
 		.availableWidth = trect.width(),
@@ -1663,6 +1691,7 @@ void Message::paintText(
 		.pausedEmoji = context.paused || On(PowerSaving::kEmojiChat),
 		.pausedSpoiler = context.paused || On(PowerSaving::kChatSpoiler),
 		.selection = context.selection,
+		.highlight = highlightRequest ? &*highlightRequest : nullptr,
 	});
 }
 
@@ -2732,10 +2761,13 @@ TextWithEntities Message::selectedQuote(
 
 TextSelection Message::selectionFromQuote(
 		const TextWithEntities &quote) const {
+	if (quote.empty()) {
+		return {};
+	}
 	const auto item = data();
 	const auto &translated = item->translatedText();
 	const auto &original = item->originalText();
-	if (&translated != &original || quote.empty()) {
+	if (&translated != &original) {
 		return {};
 	} else if (hasVisibleText()) {
 		const auto media = this->media();

Telegram/SourceFiles/history/view/history_view_pinned_section.cpp

@@ -262,7 +262,7 @@ void PinnedWidget::showAtPosition(
 		FullMsgId originId) {
 	_inner->showAtPosition(
 		position,
-		anim::type::normal,
+		{},
 		_cornerButtons.doneJumpFrom(position.fullId, originId));
 }
 
@@ -346,7 +346,7 @@ void PinnedWidget::restoreState(not_null<PinnedMemento*> memento) {
 				? FullMsgId(_history->peer->id, highlight)
 				: FullMsgId(_migratedPeer->id, -highlight)),
 			.date = TimeId(0),
-		}, anim::type::instant);
+		}, { Window::SectionShow::Way::Forward, anim::type::instant });
 	}
 }
 

Telegram/SourceFiles/history/view/history_view_replies_section.cpp

@@ -1859,16 +1859,22 @@ void RepliesWidget::finishSending() {
 	refreshTopBarActiveChat();
 }
 
+void RepliesWidget::showAtPosition(
+		Data::MessagePosition position,
+		FullMsgId originItemId) {
+	showAtPosition(position, originItemId, {});
+}
+
 void RepliesWidget::showAtPosition(
 		Data::MessagePosition position,
 		FullMsgId originItemId,
-		anim::type animated) {
+		const Window::SectionShow &params) {
 	_lastShownAt = position.fullId;
 	controller()->setActiveChatEntry(activeChat());
 	const auto ignore = (position.fullId.msg == _rootId);
 	_inner->showAtPosition(
 		position,
-		animated,
+		params,
 		_cornerButtons.doneJumpFrom(position.fullId, originItemId, ignore));
 }
 
@@ -2030,7 +2036,7 @@ bool RepliesWidget::showMessage(
 	const auto originItemId = (_cornerButtons.replyReturn() != originMessage)
 		? originMessage->fullId()
 		: FullMsgId();
-	showAtPosition(message->position(), originItemId);
+	showAtPosition(message->position(), originItemId, params);
 	return true;
 }
 
@@ -2136,7 +2142,7 @@ void RepliesWidget::restoreState(not_null<RepliesMemento*> memento) {
 		showAtPosition(Data::MessagePosition{
 			.fullId = FullMsgId(_history->peer->id, highlight),
 			.date = TimeId(0),
-		}, {}, anim::type::instant);
+		}, {}, { Window::SectionShow::Way::Forward, anim::type::instant });
 	}
 }
 

Telegram/SourceFiles/history/view/history_view_replies_section.h

@@ -208,8 +208,11 @@ private:
 	void showAtEnd();
 	void showAtPosition(
 		Data::MessagePosition position,
-		FullMsgId originItemId = {},
-		anim::type animated = anim::type::normal);
+		FullMsgId originItemId = {});
+	void showAtPosition(
+		Data::MessagePosition position,
+		FullMsgId originItemId,
+		const Window::SectionShow &params);
 	void finishSending();
 
 	void setupComposeControls();

Telegram/SourceFiles/history/view/history_view_scheduled_section.cpp

@@ -858,7 +858,7 @@ void ScheduledWidget::showAtPosition(
 		FullMsgId originId) {
 	_inner->showAtPosition(
 		position,
-		anim::type::normal,
+		{},
 		_cornerButtons.doneJumpFrom(position.fullId, originId));
 }
 

Telegram/SourceFiles/history/view/media/history_view_document.cpp

@@ -744,6 +744,7 @@ void Document::draw(
 	if (const auto captioned = Get<HistoryDocumentCaptioned>()) {
 		p.setPen(stm->historyTextFg);
 		_parent->prepareCustomEmojiPaint(p, context, captioned->caption);
+		auto highlightRequest = context.computeHighlightCache();
 		captioned->caption.draw(p, {
 			.position = { st::msgPadding.left(), captiontop },
 			.availableWidth = captionw,
@@ -756,6 +757,7 @@ void Document::draw(
 			.pausedEmoji = context.paused || On(PowerSaving::kEmojiChat),
 			.pausedSpoiler = context.paused || On(PowerSaving::kChatSpoiler),
 			.selection = selection,
+			.highlight = highlightRequest ? &*highlightRequest : nullptr,
 		});
 	}
 }

Telegram/SourceFiles/history/view/media/history_view_extended_preview.cpp

@@ -229,6 +229,7 @@ void ExtendedPreview::draw(Painter &p, const PaintContext &context) const {
 	if (!_caption.isEmpty()) {
 		p.setPen(stm->historyTextFg);
 		_parent->prepareCustomEmojiPaint(p, context, _caption);
+		auto highlightRequest = context.computeHighlightCache();
 		_caption.draw(p, {
 			.position = QPoint(
 				st::msgPadding.left(),
@@ -243,6 +244,7 @@ void ExtendedPreview::draw(Painter &p, const PaintContext &context) const {
 			.pausedEmoji = context.paused || On(PowerSaving::kEmojiChat),
 			.pausedSpoiler = context.paused || On(PowerSaving::kChatSpoiler),
 			.selection = context.selection,
+			.highlight = highlightRequest ? &*highlightRequest : nullptr,
 		});
 	} else if (!inWebPage) {
 		auto fullRight = paintx + paintw;

Telegram/SourceFiles/history/view/media/history_view_gif.cpp

@@ -716,6 +716,7 @@ void Gif::draw(Painter &p, const PaintContext &context) const {
 				_parent->width());
 			top += botTop->height;
 		}
+		auto highlightRequest = context.computeHighlightCache();
 		_caption.draw(p, {
 			.position = QPoint(st::msgPadding.left(), top),
 			.availableWidth = captionw,
@@ -728,6 +729,7 @@ void Gif::draw(Painter &p, const PaintContext &context) const {
 			.pausedEmoji = context.paused || On(PowerSaving::kEmojiChat),
 			.pausedSpoiler = context.paused || On(PowerSaving::kChatSpoiler),
 			.selection = context.selection,
+			.highlight = highlightRequest ? &*highlightRequest : nullptr,
 		});
 	} else if (!inWebPage && !skipDrawingSurrounding) {
 		auto fullRight = paintx + usex + usew;

Telegram/SourceFiles/history/view/media/history_view_media_grouped.cpp

@@ -325,12 +325,13 @@ void GroupedMedia::draw(Painter &p, const PaintContext &context) const {
 			: IsGroupItemSelection(selection, i)
 			? FullSelection
 			: TextSelection());
+		const auto highlightOpacity = IsGroupItemSelection(
+			context.highlight.range,
+			i
+		) ? context.highlight.opacity : 0.;
 		if (textSelection) {
 			selection = part.content->skipSelection(selection);
 		}
-		const auto highlightOpacity = (_mode == Mode::Grid)
-			? _parent->delegate()->elementHighlightOpacity(part.item)
-			: 0.;
 		if (!part.cache.isNull()) {
 			wasCache = true;
 		}
@@ -361,6 +362,7 @@ void GroupedMedia::draw(Painter &p, const PaintContext &context) const {
 		const auto stm = context.messageStyle();
 		p.setPen(stm->historyTextFg);
 		_parent->prepareCustomEmojiPaint(p, context, _caption);
+		auto highlightRequest = context.computeHighlightCache();
 		_caption.draw(p, {
 			.position = QPoint(
 				st::msgPadding.left(),
@@ -375,6 +377,7 @@ void GroupedMedia::draw(Painter &p, const PaintContext &context) const {
 			.pausedEmoji = context.paused || On(PowerSaving::kEmojiChat),
 			.pausedSpoiler = context.paused || On(PowerSaving::kChatSpoiler),
 			.selection = context.selection,
+			.highlight = highlightRequest ? &*highlightRequest : nullptr,
 		});
 	} else if (_parent->media() == this) {
 		auto fullRight = width();

Telegram/SourceFiles/history/view/media/history_view_photo.cpp

@@ -401,6 +401,7 @@ void Photo::draw(Painter &p, const PaintContext &context) const {
 				_parent->width());
 			top += botTop->height;
 		}
+		auto highlightRequest = context.computeHighlightCache();
 		_caption.draw(p, {
 			.position = QPoint(st::msgPadding.left(), top),
 			.availableWidth = captionw,
@@ -413,6 +414,7 @@ void Photo::draw(Painter &p, const PaintContext &context) const {
 			.pausedEmoji = context.paused || On(PowerSaving::kEmojiChat),
 			.pausedSpoiler = context.paused || On(PowerSaving::kChatSpoiler),
 			.selection = context.selection,
+			.highlight = highlightRequest ? &*highlightRequest : nullptr,
 		});
 	} else if (!inWebPage) {
 		auto fullRight = paintx + paintw;

Telegram/SourceFiles/mainwidget.cpp

@@ -1411,7 +1411,7 @@ void MainWidget::showHistory(
 		&& way != Way::Forward) {
 		clearBotStartToken(_history->peer());
 	}
-	_history->showHistory(peerId, showAtMsgId);
+	_history->showHistory(peerId, showAtMsgId, params.highlightPart);
 	if (alreadyThatPeer && params.reapplyLocalDraft) {
 		_history->applyDraft(HistoryWidget::FieldHistoryAction::NewEntry);
 	}
@@ -1772,7 +1772,7 @@ void MainWidget::showNewSection(
 	} else {
 		_mainSection = std::move(newMainSection);
 		_history->finishAnimating();
-		_history->showHistory(0, 0);
+		_history->showHistory(0, 0, {});
 
 		if (const auto entry = _mainSection->activeChat(); entry.key) {
 			_controller->setActiveChatEntry(entry);

Telegram/SourceFiles/ui/chat/chat_style.h

@@ -142,6 +142,12 @@ struct BackgroundEmojiData {
 		uint8 colorIndexPlusOne);
 };
 
+struct ChatPaintHighlight {
+	float64 opacity = 0.;
+	float64 collapsion = 0.;
+	TextSelection range;
+};
+
 struct ChatPaintContext {
 	not_null<const ChatStyle*> st;
 	const BubblePattern *bubblesPattern = nullptr;
@@ -149,11 +155,15 @@ struct ChatPaintContext {
 	QRect viewport;
 	QRect clip;
 	TextSelection selection;
+	ChatPaintHighlight highlight;
+	QPainterPath *highlightPathCache = nullptr;
+	mutable QRect highlightInterpolateTo;
 	crl::time now = 0;
 
 	void translate(int x, int y) {
 		viewport.translate(x, y);
 		clip.translate(x, y);
+		highlightInterpolateTo.translate(x, y);
 	}
 	void translate(QPoint point) {
 		translate(point.x(), point.y());
@@ -181,6 +191,19 @@ struct ChatPaintContext {
 		result.selection = selection;
 		return result;
 	}
+	[[nodiscard]] auto computeHighlightCache() const
+	-> std::optional<Ui::Text::HighlightInfoRequest> {
+		if (highlight.range.empty() || highlight.collapsion <= 0.) {
+			return {};
+		}
+		return Ui::Text::HighlightInfoRequest{
+			.range = highlight.range,
+			.interpolateTo = highlightInterpolateTo,
+			.interpolateProgress = (1. - highlight.collapsion),
+			.outPath = highlightPathCache,
+		};
+	};
+
 
 	// This is supported only in unwrapped media for now.
 	enum class SkipDrawingParts {

Telegram/SourceFiles/window/window_session_controller.h

@@ -166,6 +166,7 @@ struct SectionShow {
 		return copy;
 	}
 
+	TextWithEntities highlightPart;
 	Way way = Way::Forward;
 	anim::type animated = anim::type::normal;
 	anim::activation activation = anim::activation::normal;

Telegram/lib_ui

@@ -1 +1 @@
-Subproject commit dc8313f6ae6c87572512424818b9e24e7ef2383e
+Subproject commit 6dc93b53a1c4d237dea0a458d2b02c4171529f18