API for showing window system menu

void ShowWindowMenu(QWindow *window, const QPoint &point) {
	const auto handle = HWND(window->winId());
	const auto mapped = point * window->devicePixelRatio();
	POINT p{ mapped.x(), mapped.y() };
	ClientToScreen(handle, &p);
	SendMessage(
		handle,
		0x313 /* WM_POPUPSYSTEMMENU */,
		0,
		MAKELPARAM(p.x, p.y));
}

void ShowWindowMenu(QWindow *window, const QPoint &point) {
	const auto native = qApp->nativeInterface<QWaylandApplication>();
	const auto nativeWindow = window->nativeInterface<QWaylandWindow>();
	xdg_toplevel_show_window_menu(
		nativeWindow->surfaceRole<xdg_toplevel>(),
		native->lastInputSeat(),
		native->lastInputSerial(),
		point.x(),
		point.y());
}

void ShowWindowMenu(QWindow *window, const QPoint &point) {
	const auto connection = base::Platform::XCB::GetConnectionFromQt();
	if (!connection) {
		return;
	}

	const auto root = base::Platform::XCB::GetRootWindow(connection);
	if (!root.has_value()) {
		return;
	}

	const auto showWindowMenuAtom = base::Platform::XCB::GetAtom(
		connection,
		"_GTK_SHOW_WINDOW_MENU");

	if (!showWindowMenuAtom.has_value()) {
		return;
	}

	const auto windowGeometry = XCBWindowGeometry(window->winId());
	if (windowGeometry.isNull()) {
		return;
	}

	const auto globalPos = point
		* window->devicePixelRatio()
		+ windowGeometry.topLeft();

	xcb_client_message_event_t xev;
	xev.response_type = XCB_CLIENT_MESSAGE;
	xev.type = *showWindowMenuAtom;
	xev.sequence = 0;
	xev.window = window->winId();
	xev.format = 32;
	xev.data.data32[0] = 0;
	xev.data.data32[1] = globalPos.x();
	xev.data.data32[2] = globalPos.y();
	xev.data.data32[3] = 0;
	xev.data.data32[4] = 0;

	xcb_ungrab_pointer(connection, XCB_CURRENT_TIME);
	xcb_send_event(
		connection,
		false,
		*root,
		XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT
			| XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY,
		reinterpret_cast<const char*>(&xev));
}