Commits on Mar 12, 2016

1. Make the desktop no longer show through when alpha blending is involved …

   for borderless windows on the Mac.
   
   This was because the blend function was
   `GL_SRC_ALPHA`/`GL_ONE_MINUS_SRC_ALPHA` for both RGB and alpha, and that
   was incorrect for alpha, since a destination alpha of 1.0 and a source
   alpha < 1.0 should result in an alpha of 1.0.

   

   pcwalton committed Mar 12, 2016

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