select use large memory when dropdownMatchSelectWidth="false"

[qpxtWhite]

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

Version

2.2.8

Environment

vue 3.0

Reproduction link

Steps to reproduce

copy the demo on docs，add :dropdownMatchSelectWidth="false"

What is expected?

show the option dropdown quickly and smoothly

What is actually happening?

page no response

[tangjinzhou]

false will disable virtual scroll

[tangjinzhou]

we will update doc for it

[github-actions]

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