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Dion Moult 83d97d7e95 Fix #7616 . Make regenerate array an operator instead of an array preference

Sync children was a bit odd because it's not actually an "array
parameter" per se, just a way to regenerate. It's now an operator.

There was a deeper issue I encountered where the way arrays work is that
they duplicate the parent element. (first encountered in e51d2d )
However, the duplication code has special array handling too. To avoid
issues with this cyclical coupling the previous solution was to
reimplement object duplication (with all sorts of pitfalls that has).
Now, I've tried to decouple it further by clearing all array psets prior
to any change, and readding the pset after everything has been
regenerated.

This can be improved upon but I don't feel confident until there is more
comprehensive test coverage for the duplicate operator.

2026-01-30 17:18:02 +11:00