Plasma desktop window uses RGBA

[Martin Graesslin]

Hi all,

I just noticed that Plasma's desktop window uses an RGBA format. This is not 
only completely pointless as it's the bottom most window, it's also destroying 
all optimizations in KWin. KWin always has to go into the blending code path, 
which means rendering from bottom to top instead of rendering from top to 
bottom. And also KWin always has to clear the color buffer before rendering 
the Plasma desktop window.

Anyone an idea how we can change this?

Cheers
Martin
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