Comment 47 for bug 91786

Pretty sure any match for gnome-panel is going to match the clock applet window, In any case, I'd say it is the clock applet that has the bug as it should not mark this window as a dock type window. Metacity implements their hack for drawing shadows like this pretty much the same way we do and they have this exact same issue. Only docks should be marked as docks.

As far as I know only the clock applet and the invest applet have this problem.