[Table] 虚拟滚动不同高的行展示会有空隙

[kreja]

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

Version

Component

Table

Environment

chrome

Reproduction link

https://riddle.alibaba-inc.com/riddles/7a35fd87

Steps to reproduce

如果一开始就渲染出不同行高的话是没问题的，但是数据变化后才变成不同行高，底部就会有空隙。