select下拉菜单位置问题&max-tag-count设置后显示undefined

[tracy2zhang]

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

Version

2.0.0-beta.12

Environment

vue3.0.2

Reproduction link

https://stackblitz.com/edit/vue-5zzqvx?file=src%2Fcomponents%2FHelloWorld.vue

Steps to reproduce

1. select设置多选，max-tag-count为1，宽度设置100px
2. 选择多项，使选择框的高度因为折行而变化

What is expected?

1. 下拉菜单的位置会随着选择框的高度变化而调整
2. 超出max-tag-count的部分会显示 n

What is actually happening?

1. 下拉菜单的位置不变
2. 超出max-tag-count的部分显示 undefined

[github-actions]

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