next

pub fn next(it: *ParentIterator) ?*const WidgetData {
        const ret = it.wd;

        if (it.wd) |wd| {
            if (wd.isRoot()) {
                it.wd = null;
            } else {
                it.wd = wd.parent.data();
            }
        }

        return ret;
    }