Klipper: fix popup hiding below keep-above windows
This fixes the Meta+V menu appearing below windows set to keep above other windows. This might not strictly be an AppletPopup, but the role does what we want and there isn't anything more specific we can use instead.
BUG: 462181 FIXED-IN: 6.0.4
(cherry picked from commit c38e85b7)
79fb91cd Klipper: fix popup hiding below keep-above windows