Contour selection behavior
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Click-Select a contour also selects the 2 nodes. When selecting the side of a triangle and deleting it (in order to get an open contour), only 1 node remains, instead of 3 nodes and 2 contours.
you need to break it first, 1 extra step :(
see http://www.flickr.com/photos/opto/6230424329/in/photostream/
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command + c --> cutting segments out
alt + del --> breaking contours on the selected points
