[PATCH] 3d look for kwin alt-tab window selector aka tabbox

[Alexander Dymo]

Hi,
I'd like to propose to add some 3d-ness to the default alt-tab window selector 
(tabbox) in kwin. The reason is that the tabbox is indistinguishable visually 
from the topmost window if the window has white background (see "before" 
screenshot). 

And I noticed that almost all apps I use - kdevelop, dolphin, kmail and 
firefox have white backgrounds which make it hard to see the alt-tab selector.

Admitteddly, with desktop effects enabled and window shadow it's a bit better, 
but only a bit (at least for me, - I don't distinguish colors that well).

What would you say about some 3d shape to the window? Please see the patch and 
"after" screenshot attached.

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