With fixed table popover occlusion, z-index cannot be resolved

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

Version

3.0.0-alpha.15

Environment

chrome 95 / 96/ vue3@lasted,vite@2,

Reproduction link

Steps to reproduce

给popover，getpopupcontainer 设置自定义container，同时，该列处于fix状态。 placement为bottom，遮挡，提升z index 无效，
默认是body，不会遮挡，但是表格滚动，pop在未关闭的情况下会错位，所以采用自定义容器。

What is expected?

不遮挡

What is actually happening?

遮挡

[tangjinzhou]

因为是固定列设置了 zindex，bottom 后会被下面的单元格覆盖，你可以通过 tableRef 查找到 table body, 给到getPopupContainer

[github-actions]

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