[Bug Report] The menu will flash after setting this 'unique-opened'
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stale
- Dominant language
- Vue
- Stars
- 54k
- Forks
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Description
### Element UI version
2.13.0
### OS/Browsers version
windows 10 chrome版本 79.0.3945.88（正式版本） （64 位）
### Vue version
2.6.11
### Reproduction Link
https://codepen.io/EmperorOfEuropa/pen/MWYERNy
### Steps to reproduce
Please click on the first one named 'click me'.
### What is Expected?
It won't flash white
### What is actually happening?
It will flash white
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Assessment
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