Hi Folks,

Attached is a test+fix for alpha compositing in BitBlt. It turns out that
when you're using Form>>blend (aka: alpha compositing) the resulting alpha
values are not at all what they should be. VERY problematic for stuff like
anti-aliasing.

[Note to harvesters: Please consider integration ASAP. This presence of this
fix in the appropriate VMs will be critical for Croquet].

Cheers,
  - Andreas
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