How to reproduce:
- turn on intelligently hide panel (and keep one panel downwards only)
- turn on a full-screen application (and that should be the only app running)
- use alt+tab
Other quirks:
- Somehow, the "always show panel" button nullifies that effect, with the tradeoff of freezing for half a second.
- Moreover, the desklet of clock@schorschii appeared on top, like, even after I opened anything, the desklet didn't keep itself confined to the desktop.
I'll be more than happy to share my inxi details.