This change allows the chaining function to select edges
from the same contour loop first, thus reduced rouge chain
connections (connected different objects instead of chaining
inside the same object first) and improved chaining quality.
This patch also included the default value change for chain
split threshold (Now don't split by default to make initial
result as smooth as possible)
Reviewed By: Sebastian Parborg (zeddb)
Differential Revision: https://developer.blender.org/D14950
2719869a2a