Description of problem:
Given a panel with both autohide enabled, and a "Window List"[?] tray[?] with
"Always group windows" selected, after selecting a menu-entry in a grouped
window menu the panel forgets to autohide.
(a menu entry might be from having multiple firefox windows open)
A work around is to wave the mouse over the non-hiding panel.
Still present in FC6/FC7 and also reported upstream in
Okay, let's let this trickle in from upstream.