xorg/shadowfb: Damage routines are done completely for shadowfb needed in virtualbox

[Kasberger Andreas]

Hello,

Working with virtualbox I came to some situation were the shadowfb were not updated correctly in all cases.
Simply some routines are missing in shadowfb but done in xdamage part.
So I just done this for shadowfb too.
With this patch I think this bug
https://bugs.freedesktop.org/show_bug.cgi?id=31303
is solved with this patch.
Artefacts during certain draw operations staying on the screen until compete redraw was done. In the fb itself everything was correct e.g making a screenshot.

Signed-off-by: Andreas Kasberger <Kasberger at heidenhain.de<mailto:Kasberger at heidenhain.de>>

Best regards
   Andreas



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