Merge boundary edges filter/method?

I am subdividing part of a mesh by extracting those cells, subdividing, then
using AppendPolyData filter to patch it back in exactly to the hole it left.
However, this leaves boundary edges as shown below in green (even after
CleanPolyData filter), where there is obviously a mismatch in triangulation.

Is there any filter that can merge edges which are on top of eachother (just
as cleanpolydata does for points) ?
<http://vtk.1045678.n5.nabble.com/file/t325404/boundaries.png> 






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