modal中设置auto-size的textarea的高度在首次打开和二次打开modal时不一致

[NoTalk-ly]

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

Version

1.6.5

Environment

chrome: 85.0.4183.121 OS: Mac OS 10.15.2

Reproduction link

Steps to reproduce

codesandbox即可复现

What is expected?

期望无论哪次打开弹窗 textarea高度都一致为3行(当前例子中)

What is actually happening?

点击按钮打开弹窗，textarea 此时高度为3行
点击弹窗cancel按钮关闭弹窗后再打开弹窗，此时textarea高度变成了2行

[NoTalk-ly]

有人能回复下吗？随时可以协助复现该bug。

[John60676]

临时方案：在把 v-if 放到 a-modal 外面
https://codesandbox.io/s/vue-antd-template-textarea-within-modal-bug-forked-ss5sj?file=/src/App.vue

[github-actions]

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