Fix stl reader for multiple patches
This builds upon and subsumes the work done in !89 (closed).
Mainly, it adds a test for the STL reader, including a test for the use case cited in !89 (closed).
This builds upon and subsumes the work done in !89 (closed).
Mainly, it adds a test for the STL reader, including a test for the use case cited in !89 (closed).