d6e49385cf
The code added to postprocess the manifold result to remove extra vertices introduced on edges had a logic bug in it. It would sometimes dissolve a vertex from a triangle. I thought that would be very rare and just repeated a vertex to fill out the triangle, but that leads to a mesh that doesn't validate. Anyway, my logic to prevent a single vertex from being dissolved from a triangle was wrong (if the triangle was seen second while looking). I fixed that, and then the even rarer case of two vertices being dissolved from a quad showed up. I have prevented all such cases by a loop that disables all vertex dissolving in faces where it would leave less than three vertices. Also added an assert (so, debug-mode only) that the mesh produced by manifold boolean is valid.
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