This code is nonsensical. You end up creating a screen-sized pixmap
that's totally detached from everything else, which you then listen for
damage on, which means you'll never hear any damage, which means your
shadow update hooks will never get called. Any driver using this would
be sorely disappointed.
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
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