Commits on Jul 16, 2018

1. Push an empty hit testing clip node for empty ClipNodes …

   Some Gecko display lists produce out-of-sequence ClipIds for ClipNodes
   (#2898) which leads to empty ClipNodes. Previously the HitTester was
   just discarding those nodes. This is an obvious problem because it means
   that subsequent ClipNodeIndices are out-of-sync with the HitTester's
   list of clipping nodes. This change fixes this by also adding empty
   clipping nodes in the HitTester.
   
   Unfortunately, we can't make a test for this until we figure out how and
   why Gecko is producing display lists with out-of-sequence ClipIds.
   Hopefully once we do that, we will no longer need to create empty
   HitTester nodes at all.

   

   mrobinson committed Jul 16, 2018

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