sna: Refine the self-cow copy hack to reduce collateral damage

Sergio Callegari found a case in LibreOffice that copied cloned pixmaps
onto each other and then modified one of the pair. This was triggering
the hack put in to speed up firefox scrolling, unfortunately.

Reported-by: Sergio Callegari <sergio.callegari@gmail.com>
References: https://bugs.freedesktop.org/show_bug.cgi?id=65665
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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