[Bug 47838] Add a dual-screen Windows VM

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=47838

--- Comment #1 from François Gouget <fgouget at codeweavers.com> ---
With Windows guests adding a multi-head configuration is pretty easy: just
configure it with two QXL graphics video cards. Then tell Windows how you want
those two screens set up. The VM can then be rebooted or powered off and the
two screens will still be there.

Of course the TestBot has been using the basic VGA graphics video card a lot to
minimize the Direct3D errors so switching to QXL may have an impact on the test
results. But it could be argued that it also makes sense to test the QXL driver
as that's what's meant to be used in QEmu's Windows guests. Maybe it will help
improve the QXL driver.

A side-effect of a dual-screen configuration is that it breaks the TestBot
screenshots: all we get is a black screen that says "Guest has not initialized
the display (yet).". Even testing with virt-viewer, taking a screenshot only
captures the screen displayed by that window. Some investigation is necessary
to see if there's a fix for that (we currently ask to capture screen 0:
screenshot($Stream, 0, 0)). Another option would be to do the screenshots on
the client side where we may be better able to deal with multiple screen setups
(see bug 44709).

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