user32: Track the number of GL surfaces for a window rather than the pixel format.

[Stefan Dösinger]

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Am 2014-05-07 22:50, schrieb Ken Thomases:
> Beyond that, although I'm not aware of a case where an app uses two
>  D3D devices to target the same window, I'm also not seeing
> anything in the docs which says it's not allowed.
There are applications that use two devices, even if they don't render
from both. Sins of a Solar Empire (the relatively new game on Steam) is
such a case. I also remember seeing this in ddraw, but I can't think
of any specific game right now.

My general impression of such applications is that they fail to
release the old device rather than deliberately use two different devices.
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