Bug - Popper - menus sometimes flickering when attached with popper

[nicolethoen]

Menus attached to triggers via a Popper are sometimes flashing in the left corner of the screen before positioning correctly.

It was first reported in this PR comment:
#8868 (comment)

It can be seen in demos such as:
https://patternfly-react-v5.surge.sh/components/search-input/react-demos/#composable-advanced-search