Icons in menu and tasklist: why are they displayed differently?

[Paul Barnfather <plb clanger9 demon co uk>]

On an 8 bit display, icons display just fine in the Menu, but are all
screwed up in the Tasklist.

Is there any particular reason why this should happen? Tasklist seems
you use gdk_pixbuf_render_to_drawable_alpha(), whereas the Menu uses
gdk_pixbuf_render_pixmap_and_mask() as far as I can tell.

Is this where the problem lies?
Is one method correct/incorrect, and (more importantly) why does one
seem to work better than the other?

If this is a clueless newbie question, then I apologise ;-)

-- 
 ~~~~~~~~~~~~~~~~~~~~~~~~ Paul Barnfather ~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
|  plb@clanger9.demon.co.uk  paul.barnfather@northern-electric.co.uk |
|      __           http://www.clanger9.demon.co.uk    .             |
     o--o-... 75TS                                    o'~o... 750SS