Commits on Jul 9, 2018

1. Split the ClipScrollTree …

   Split the ClipScrollTree into a collection of spatial nodes and a
   collection of clipping nodes. This makes it so that no unnecessary work
   is done or storage is used for clipping nodes. It also allows us to
   simplify certain bits of code that had to deal with both types of nodes.
   
   During display list "flattening," positioning ClipIds are converted to
   SpatialNodeIndices by consulting the ClipNode for their positioning
   node. ClipIds were already converted directly into ClipChainIndices.
   
   Eventually this change should make it to the API, meaning that we expose
   the difference between the different node types. This will make it
   harder to misuse the API and allow us to do away with looking up the
   positioning node of clips during flattening.

   

   mrobinson committed Jul 9, 2018

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