Keyboard navigation in closed topics.

Fixes #27319.
Fixes #28288.

Telegram/SourceFiles/history/view/history_view_chat_preview.cpp

@@ -480,6 +480,11 @@ void Item::setupHistory() {
 	using Type = Ui::ElasticScroll::OverscrollType;
 	_scroll->setOverscrollTypes(Type::Real, Type::Real);
 
+	_inner->scrollKeyEvents(
+	) | rpl::start_with_next([=](not_null<QKeyEvent*> e) {
+		_scroll->keyPressEvent(e);
+	}, lifetime());
+
 	_scroll->events() | rpl::start_with_next([=](not_null<QEvent*> e) {
 		if (e->type() == QEvent::MouseButtonDblClick) {
 			const auto button = static_cast<QMouseEvent*>(e.get())->button();

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -2604,7 +2604,11 @@ auto ListWidget::countScrollState() const -> ScrollTopState {
 }
 
 void ListWidget::keyPressEvent(QKeyEvent *e) {
-	if (e->key() == Qt::Key_Escape || e->key() == Qt::Key_Back) {
+	const auto key = e->key();
+	const auto hasModifiers = (Qt::NoModifier !=
+		(e->modifiers()
+			& ~(Qt::KeypadModifier | Qt::GroupSwitchModifier)));
+	if (key == Qt::Key_Escape || key == Qt::Key_Back) {
 		if (hasSelectedText() || hasSelectedItems()) {
 			cancelSelection();
 		} else {
@@ -2616,22 +2620,33 @@ void ListWidget::keyPressEvent(QKeyEvent *e) {
 		&& !hasCopyRestrictionForSelected()) {
 		TextUtilities::SetClipboardText(getSelectedText());
 #ifdef Q_OS_MAC
-	} else if (e->key() == Qt::Key_E
+	} else if (key == Qt::Key_E
 		&& e->modifiers().testFlag(Qt::ControlModifier)
 		&& !showCopyRestriction()
 		&& !hasCopyRestrictionForSelected()) {
 		TextUtilities::SetClipboardText(getSelectedText(), QClipboard::FindBuffer);
 #endif // Q_OS_MAC
-	} else if (e == QKeySequence::Delete || e->key() == Qt::Key_Backspace) {
+	} else if (e == QKeySequence::Delete || key == Qt::Key_Backspace) {
 		_delegate->listDeleteRequest();
+	} else if (!hasModifiers
+		&& ((key == Qt::Key_Up)
+			|| (key == Qt::Key_Down)
+			|| (key == Qt::Key_PageUp)
+			|| (key == Qt::Key_PageDown))) {
+		_scrollKeyEvents.fire(std::move(e));
 	} else if (!(e->modifiers() & ~Qt::ShiftModifier)
-		&& e->key() != Qt::Key_Shift) {
+		&& key != Qt::Key_Shift) {
 		_delegate->listTryProcessKeyInput(e);
 	} else {
 		e->ignore();
 	}
 }
 
+auto ListWidget::scrollKeyEvents() const
+-> rpl::producer<not_null<QKeyEvent*>> {
+	return _scrollKeyEvents.events();
+}
+
 void ListWidget::mouseDoubleClickEvent(QMouseEvent *e) {
 	mouseActionStart(e->globalPos(), e->button());
 	trySwitchToWordSelection();

Telegram/SourceFiles/history/view/history_view_list_widget.h

@@ -382,6 +382,10 @@ public:
 		const TextState &reactionState) const;
 	void toggleFavoriteReaction(not_null<Element*> view) const;
 
+
+	[[nodiscard]] auto scrollKeyEvents() const
+		-> rpl::producer<not_null<QKeyEvent*>>;
+
 	// ElementDelegate interface.
 	Context elementContext() override;
 	bool elementUnderCursor(not_null<const Element*> view) override;
@@ -851,6 +855,7 @@ private:
 	rpl::event_stream<ReplyToMessageRequest> _requestedToReplyToMessage;
 	rpl::event_stream<FullMsgId> _requestedToReadMessage;
 	rpl::event_stream<FullMsgId> _requestedToShowMessage;
+	rpl::event_stream<not_null<QKeyEvent*>> _scrollKeyEvents;
 
 	rpl::lifetime _viewerLifetime;
 

Telegram/SourceFiles/history/view/history_view_replies_section.cpp

@@ -797,7 +797,9 @@ void RepliesWidget::setupComposeControls() {
 		}
 	}, lifetime());
 
-	_composeControls->scrollKeyEvents(
+	rpl::merge(
+		_composeControls->scrollKeyEvents(),
+		_inner->scrollKeyEvents()
 	) | rpl::start_with_next([=](not_null<QKeyEvent*> e) {
 		_scroll->keyPressEvent(e);
 	}, lifetime());

Telegram/SourceFiles/history/view/history_view_scheduled_section.cpp

@@ -378,7 +378,9 @@ void ScheduledWidget::setupComposeControls() {
 		}
 	}, lifetime());
 
-	_composeControls->scrollKeyEvents(
+	rpl::merge(
+		_composeControls->scrollKeyEvents(),
+		_inner->scrollKeyEvents()
 	) | rpl::start_with_next([=](not_null<QKeyEvent*> e) {
 		_scroll->keyPressEvent(e);
 	}, lifetime());

Telegram/SourceFiles/settings/business/settings_shortcut_messages.cpp

@@ -715,7 +715,9 @@ void ShortcutMessages::setupComposeControls() {
 		}
 	}, lifetime());
 
-	_composeControls->scrollKeyEvents(
+	rpl::merge(
+		_composeControls->scrollKeyEvents(),
+		_inner->scrollKeyEvents()
 	) | rpl::start_with_next([=](not_null<QKeyEvent*> e) {
 		_scroll->keyPressEvent(e);
 	}, lifetime());

Telegram/lib_ui

@@ -1 +1 @@
-Subproject commit 6ce5ec6e43a28678ca89fd89b2fa90164e5bcef1
+Subproject commit 4ae0ffe56efb20f795062713780c79e79cd39879