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The original coding grouped normal and construction geometries together regardless of the actual order.
If construction geometries where interleaved with normal geometries, all normal would be grouped into a single
list and all construction into another.
This causes a problem that indices referenced in constraints may not match.
This commit fixes this behaviour. While still creating as much geometries together as a list, as many lists as
necessary are created to keep the order of creation.
790e28c5e9