ec3399efa6882ea5a8fe023092c0918ee7b135d9

First half of the problem is fixed, but the second issue regarding edge/vertex snapping disregarding angle constraints will need some refactoring eventually.
This backtracks an error introduced in r48155 when trying to fix: http://projects.blender.org/tracker/?func=detail&atid=498&aid=31433&group_id=9
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