When select is searchable and the number of options is 9 or 10, the drop-down box cannot be scrolled after searching

[tracy2zhang]

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

Version

3.0.0-alpha.13

Environment

vue3.2.16, chrome 95.0.4638.69，macos12.0.1

Reproduction link

Steps to reproduce

1.设置select可搜索（多选或单选showSearch为true）
2.options数量设置9或者10
3.在输入框中搜索选项（确保是能搜到的，搜到空的话不会复现）
4.选中一项或点击其他区域收起下拉弹框
5.再次点开下拉弹框

What is expected?

再次点开下拉弹框后，下拉弹框仍然可以滚动

What is actually happening?

再次点开下拉弹框后，下拉弹框无法滚动

---

1. 如果options数量大于10，则不会出现上面的问题，但是会有另外一个小问题，就是下拉弹框在filter后即使只有一条，右边的滚动条也会显示
2. 滚动条的高度所体现的滚动比例也比较奇怪，比如有9条options的时候也就是其实只有最后一条超出了显示范围，但此时滚动条的高度只有下拉弹框高度的一半，让人感觉下面还有很多东西没看到

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