[Bug 65665] Rendering issues are back on gen4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65665

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ugg. My hack strikes back:

commit 5189ba727fe48990f00d5787c53d7b15fa1838a4
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat Jun 22 13:39:47 2013 +0100

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

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