Panel in hiding mode flickers when opening application menu
## Submitted by Yousuf Philips `@philipzae` Assigned to **Xfce Bug Triage** **[Link to original bug (#16765)](https://bugzilla.xfce.org/show_bug.cgi?id=16765)** ## Description Steps: 1. add classic application menu to panel 2. set panel to always hide 3. click to open application menu 4. notice flicker in the menu https://youtu.be/wVJVixbF5hQ (flicker appears at 00:29) Version: Unspecified
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