static Client *xytosurface(double x, double y,
		struct wlr_surface **surface, double *sx, double *sy);

		c = xytosurface(cursor->x, cursor->y, &surface, NULL, NULL);
		if (c)

		if ((c = xytoclient(cursor->x, cursor->y))) {
			surface = wlr_xdg_surface_surface_at(c->xdg_surface,
					cursor->x - c->geom.x - c->bw,
					cursor->y - c->geom.y - c->bw, NULL, NULL);

		}

	c = xytosurface(cursor->x, cursor->y, &surface, &sx, &sy);

	if ((c = xytoclient(cursor->x, cursor->y)))
		surface = wlr_xdg_surface_surface_at(c->xdg_surface,
				cursor->x - c->geom.x - c->bw,
				cursor->y - c->geom.y - c->bw, &sx, &sy);

}
Client *
xytosurface(double x, double y,
		struct wlr_surface **surface, double *sx, double *sy)
{
	Client *c = xytoclient(x, y);
	/*
	 * 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 x and y (in 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.
	 */
	/* XXX set *surface to xdg_surface->surface otherwise?  what should
	 * sx/sy be in that case? */
	if (c)
		*surface = wlr_xdg_surface_surface_at(c->xdg_surface,
				x - c->geom.x - c->bw,
				y - c->geom.y - c->bw, sx, sy);
	return c;