Render issue: dropdown list briefly shows up before jumping to correct position [Win, chrome/firefox)

[silenzium]

Hi, great component!

I recently discovered a new bug, which has not been there in previous versions. When clicking on a superselect field, the dropdown list blinks up on the left edge or left top corner of the page before it gets correctly rendered below the select field.

This can be seen in Example 4 as well. (link not accessable directly, go here and select Options Grouping)

Can we perhaps hide it with opacity:0 before it gets positioned by script?

[THMKAE]

Might be related to https://github.com/callemall/material-ui/issues/8040

[Sharlaan]

exact.