kvm-84 -- Cirrus video updates bad on XP

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Running an XP0 guest under kvm-84 with Cirrus VGA, screen updates (notably 
when copying regions of windows around during scrolling) are delayed or 
lost, so that indivudual window contents are occasionally illegible. After 
waiting a while, or moving the mouse around over the window, the updates 
seem to "catch up" and order is restored.

Reverting to kvm-83 removes this behaviour.

I notice quite a few changes to the QEMU VGA interals from -83 to -84,
inluding in the Cirrus-specific bitblitting code.

Any ideas?

XP2 with '-vga std' seems to be fine. So does X on Linux with the cirrus 
driver.

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