Commits on Apr 30, 2018

1. Fix issue with optimized away clip segments …

   When clip segments were optimized away due to having no intersection
   with the outer screen bounds, they were treated as opaque regions. This
   is due to the fact that an Option is not expressive enough to represent
   the three different kinds of distinct destinies of clip segments.
   
   This change replaces the Option with an enum that is either a
   RenderTaskId, Opaque, or Empty to represent a clip segment that should
   not be rendered.
   
   Fixes #2700.

   

   mrobinson committed Apr 30, 2018

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