Menu flashes and repeats in case of automatic omission

[aug-sunrise]

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

Version

undefined

Environment

window,chrome86.0.4240.183,vue2.6.11

Reproduction link

Steps to reproduce

When the screen width is changed dynamically, the menu will shrink automatically. At this time, the secondary menu in the contracted primary menu will appear repetition. When the screen length is certain, the menu level 1 will flash

What is expected?

The menu will not flash or repeat when it shrinks automatically

What is actually happening?

The menu will flash and repeat when it is automatically contracted

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When the outer div length of the menu is not enough, the menu will automatically shrink to an ellipsis. At this time, the mouse hovers to display the secondary menu, and when the length is certain, the primary menu will flash

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