struct wlr_surface **surface, double *sx, double *sy);
static bool xytosurface(Client *c, double lx, double ly,

		if (xytosurface(c, lx, ly, surface, sx, sy)) {

		/*
		 * XDG toplevels may have nested surfaces, such as popup windows
		 * for context menus or tooltips. This function tests if any of
		 * those are underneath the coordinates lx and ly (in output
		 * Layout Coordinates). If so, it sets the surface pointer to
		 * that wlr_surface and the sx and sy coordinates to the
		 * coordinates relative to that surface's top-left corner.
		 */
		double _sx, _sy;
		struct wlr_surface *_surface = NULL;
		_surface = wlr_xdg_surface_surface_at(c->xdg_surface,
				lx - c->x, ly - c->y, &_sx, &_sy);
		if (_surface != NULL) {
			*sx = _sx;
			*sy = _sy;
			*surface = _surface;

bool
xytosurface(Client *c, double lx, double ly,
		struct wlr_surface **surface, double *sx, double *sy)
{
	/*
	 * XDG toplevels may have nested surfaces, such as popup windows for context
	 * menus or tooltips. This function tests if any of those are underneath the
	 * coordinates lx and ly (in output Layout Coordinates). If so, it sets the
	 * surface pointer to that wlr_surface and the sx and sy coordinates to the
	 * coordinates relative to that surface's top-left corner.
	 */
	double client_sx = lx - c->x;
	double client_sy = ly - c->y;
	struct wlr_surface_state *state = &c->xdg_surface->surface->current;
	double _sx, _sy;
	struct wlr_surface *_surface = NULL;
	_surface = wlr_xdg_surface_surface_at(
			c->xdg_surface, client_sx, client_sy, &_sx, &_sy);
	if (_surface != NULL) {
		*sx = _sx;
		*sy = _sy;
		*surface = _surface;
		return true;
	}
	return false;
}