Upload 组件 list-type="picture" 的时候，在 before-upload 回调返回 false 时仍然将已经拒绝的文件加入 file-list

[yf-hk]

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详情见：https://codepen.io/andyhu/pen/NWPZmVN
所以怎样才能阻止不符合规则的文件添加到文件列表？

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