Method grow

lv2export/includes/rack.hpp:346–351

        return Rect(Vec(), size);
    }
    Rect grow(Vec delta) const {
        Rect r;
        r.pos = pos.minus(delta);
        r.size = size.plus(delta.mult(2.f));
        return r;
    }
    Rect shrink(Vec delta) const {
        Rect r;
        r.pos = pos.plus(delta);