[Bug Report] select option 名字很长的时候，竟然全部显示出来了，太丑了，难看
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- Dominant language
- Vue
- Stars
- 54k
- Forks
- 14.4k
- PR merge metrics
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Description
### Element UI version
2.13.2
### OS/Browsers version
chrome
### Vue version
3.0.2
### Reproduction Link
https://codepen.io/pen/?&editable=true=https%3A%2F%2Felement.eleme.io%2F
### Steps to reproduce
select多选，option label 设置的长一些
### What is Expected?
select多选，option label 太长，需要隐藏
### What is actually happening?
没有隐藏，全部显示出来了
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