930d645b4c
When the cage mesh is the output of a modifier that supports deforming BMesh directly, it will be a mesh wrapper and `MR_EXTRACT_BMESH` will be used. Otherwise the cage mesh will be a `Mesh` and its own normals should be drawn instead of the the original normals. Thought this seems deceivingly simple, it works with no modifiers, BMesh-deforming modifiers with cage enabled and disabled, and topology changing modifiers, which should be all the possible cases here.
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