FIX: popping of contiguous line-elements was too rigorous #52
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There was one more test I changed in #51 because it gave different results.
Upon better looking, I'd to conclude that #51 was to rigorous.
Current assumption, until its proven wrong: the first and last arc can be contiguous line-elements, in this case only 1 arc is poped. OR all the arcs are contigous in the given geometry and all arcs minus 1 are popped.
Introduced wrong behavior did pop all arcs minus 1 even only 1 arc should be popped.