Submodel sort different between Windows and Mac

[cybercop23]

With the addition of the new PR... #4370, when you expand a Model with submodels, the submodel order is the eactly the reverse between Windows and Mac. Windoes is correct, but Mac is totally upside down.

Left 2 are the true submodels for the SS Spinner and Flake and on the right is the order of the expanded model on the import dialog.