在使用 VLayout 后，当 RecyclerView 滚动到底部时，调用 canScrollVertically 返回的值不正确

After using VLayout, when the RecyclerView scrolls to the bottom and then pulls up again, the pull-up loading more will check whether the View can scroll vertically. The method ``View.canScrollVertically(1);`` will be called. In a RecyclerView without VLayout, this method will return false. The return value using VLayout is uncertain.