Pick best supported alpha composite mode from surface#68
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Previously, the alpha composite mode was always set to auto, which only picks between
OpaqueandInherit,but on Wayland (and possibly other platforms), the surface only supports
OpaqueandPreMultiplied,so transparent windows would never work.
This is very lazy way to query the surface capabilities for the highest supported alpha mode, which will pick the first of, in order,
Inherit,PostMultiplied,PreMultiplied,Opaque, orAuto(according to the enum)