FIX: Use max_category_nesting when importing categories (PR #13105)

It allowed for a parent category and a sub-category.


I think the condition is inverted - this should be proposed_nesting <= max_category_nesting

No, that is correct. I just tried this again and it is all working as expected.

The idea is to ensure that the parent category (top) is on a maximum level of max_category_nesting - 1.

Oh, the loop is running “while invalid”. OK