Blender Git Loki

Fix Bevel artifacts bug T37053

In the case that there are two beveled edges with one unbeveled
one in between, and the widths don't allow them to magically
line up, it is better to slide along unbeveled edge.

Sometimes bevel widths are uneven (this was the case before)
and it is a followup TODO to do a width cleanup pass afterwards
to even the edges up as much as possible.