when set getPopupContainer. after search no data. when click search icon again. the dropdown style is wrong

[xilanhuaweidapao]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.7.7

Environment

vue2.6

Reproduction link

Steps to reproduce

1.设置表格组件 :getPopupContainer="triggerNode => triggerNode.parentNode"
2.添加搜索配置，搜索不存在的数据，然后再点击搜索图标

What is expected?

期望下拉框样式正确

What is actually happening?

下拉框位置错乱

[tangjinzhou]

自定义调整 z-index 层级

[github-actions]

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