static void zoom(const Arg *arg);

}
void
zoom(const Arg *arg)
{
	unsigned int n = 0;
	Client *c, *sel = selclient();
	if (!sel || !selmon->lt[selmon->sellt]->arrange || sel->isfloating)
		return;
	wl_list_for_each(c, &clients, link)
		if (VISIBLEON(c, selmon) && !c->isfloating) {
			if (++n == 1 && c == sel)
				sel = NULL;
			else if (n == 2) {
				if (!sel)
					sel = c;
				break;
			}
		}
	if (n == 1)
		return;
	wl_list_remove(&sel->link);
	wl_list_insert(&clients, &sel->link);
	focusclient(sel, NULL, 1);
	arrange(selmon);

	{ MODKEY,                    XKB_KEY_Return,     zoom,           {0} },