Comment 28 for bug 91786

@ Travis Watkins
"The panel is always on top of everything except another panel"
The panel as well as the active window are both a candidate for user interaction, hence none of them should be covered by *anything*. with a big enough shadow this becomes a usability problem. metacity proves it can be done, see third screenshot above.
(i know that technically the panel was always on top, but it didn't feel this way until we had shadows, and it shouln't feel this way)