Copy only non-kerning groups explicitly #579
Merged
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ufoProcessor does the same: https://github.com/LettError/ufoProcessor/blob/c23240dc20922fed84b458632041310dea526c2d/Lib/ufoProcessor/__init__.py#L688-L694.
Kerning groups are taken care of by MathKerning.
This should have no user-visible impact but is more a "doing it a bit more correctly" type of change.