Version 4.7 When activating the compositor and checking "shadow under dock windows" the panel has no shadow.
Weird. This only happens when I set a rgba colormap on the panel-window. Olivier? Looks like a xfwm4 bug? gtk_widget_set_colormap (GTK_WIDGET (toplevel), rgba_colormap) breaks this behaviour.
This is normal, argb window are by definition transparent/translucent/shaped so there is no sense in adding a shadow (a "swuare" shadow under a shaped/transparent window looks awful). No bug here.