rioresize: apply an arrange if changing monitors

patch/riodraw.c

@@ -57,6 +57,7 @@ rioposition(Client *c, int x, int y, int w, int h)
 	if ((m = recttomon(x, y, w, h)) && m != c->mon) {
 		detach(c);
 		detachstack(c);
+		arrange(c->mon);
 		c->mon = m;
 		c->tags = m->tagset[m->seltags];
 		attach(c);