Part: Offset2D: fix save-load instability (bug #2699) #285
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Fixes #2699
It was found out that when direction of normal found by FindPlane
depends on if we are using result of offset directly, or after copying.
The fix (workaround) is to copy offset result inside offset routine, so
that no unstable behavior makes its way to the user.
http://www.freecadweb.org/tracker/view.php?id=2699
http://forum.freecadweb.org/viewtopic.php?f=3&t=17449