Drop shadows

[Herve Guillemet]

Hello,

On my system (Gentoo AMD64 nvidia XFCE 4.2.3.2), drop shadows do not work
correctly: if I have a small window on top of a larger one, then click
on the title bar of the large window to move it on top, the
small window goes behind but its drop shadow is still visible.

I guess it's not an XFCE bug, but then it would be nice to desactivate
the drop shwdows from XFCE, but still keep the transparency. Is this 
possible ?

Thx,