I use this function, it makes a client float and maximize.
void
togglemax(const Arg *arg) {
Client *c;
if(!(c = selmon->sel))
return;
Monitor *m = c->mon;
c->isfloating = !c->isfloating || c->isfixed;
if(c->isfloating)
resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 *
c->bw, True);
arrange(selmon);
}
Bar and Border remain, but if you change
resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 *
c->bw, True);
to
resize(c, m->wx, m->wy, m->ww, m->wh, True);
it should do a fullscreen (not tested).
