Bug in mergeCoplanarFaces?

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What steps will reproduce the problem?

I am trying to merge coplanar facets by the function 'mergeCoplanarFaces' of 
Carve. The function works when all edges are shared by two facets.

However, for the edges which are shared by more than 2 facets and if two of the 
facets are coplanar, these two facets are also merged. 

What is the expected output? What do you see instead?
I think in this case the coplanar facets can't be merged.

What version of the product are you using? On what operating system?
latest version.

Please provide any additional information below.
Please see the attached files, mergeCoplanarFace0 is the object before merging 
and mergeCoplanarFace is the result.

Original issue reported on code.google.com by [email protected] on 16 Jul 2014 at 2:08

Attachments:

• mergeCoplanarFace0.ply
• mergeCoplanarFace0_bin.ply
• mergeCoplanarFace.ply
• mergeCoplanarFace_bin.ply