Click on root pinned bar throws to replies start.

Telegram/SourceFiles/history/view/history_view_replies_section.cpp

@@ -270,7 +270,7 @@ void RepliesWidget::setupRootView() {
 	raw->resize(raw->width(), st::historyReplyHeight);
 	raw->paintRequest(
 	) | rpl::start_with_next([=](QRect clip) {
-		auto p = Painter(_rootView->entity());
+		auto p = Painter(raw);
 		p.fillRect(clip, st::historyPinnedBg);
 
 		auto top = st::msgReplyPadding.top();
@@ -308,6 +308,25 @@ void RepliesWidget::setupRootView() {
 		}
 	}, raw->lifetime());
 
+	raw->setCursor(style::cur_pointer);
+	const auto pressed = raw->lifetime().make_state<bool>();
+	raw->events(
+	) | rpl::start_with_next([=](not_null<QEvent*> e) {
+		const auto mouse = static_cast<QMouseEvent*>(e.get());
+		if (e->type() == QEvent::MouseButtonPress) {
+			if (mouse->button() == Qt::LeftButton) {
+				*pressed = true;
+			}
+		} else if (e->type() == QEvent::MouseButtonRelease) {
+			if (mouse->button() == Qt::LeftButton) {
+				if (base::take(*pressed)
+					&& raw->rect().contains(mouse->pos())) {
+					showAtStart();
+				}
+			}
+		}
+	}, raw->lifetime());
+
 	_rootView->geometryValue(
 	) | rpl::start_with_next([=](QRect rect) {
 		_rootShadow->moveToLeft(
@@ -1068,6 +1087,10 @@ void RepliesWidget::scrollDownClicked() {
 	}
 }
 
+void RepliesWidget::showAtStart() {
+	showAtPosition(Data::MinMessagePosition);
+}
+
 void RepliesWidget::showAtEnd() {
 	showAtPosition(Data::MaxMessagePosition);
 }

Telegram/SourceFiles/history/view/history_view_replies_section.h

@@ -141,6 +141,7 @@ private:
 	void updateAdaptiveLayout();
 	void saveState(not_null<RepliesMemento*> memento);
 	void restoreState(not_null<RepliesMemento*> memento);
+	void showAtStart();
 	void showAtEnd();
 	void showAtPosition(
 		Data::MessagePosition position,