Task 7 extended JobStock.Quantity = -1 (unlimited) to catalog-sourced
rows, but the post-pack classification step in CutListPackingService
only ever treated a catalog-sourced bin as "in stock" when its tracked
quantity was a positive finite number. An unlimited catalog row fell
through to "to be purchased" even though IsInStock=true just means the
bin is catalog-sourced, not a quantity check.
This made the classification effectively unreachable for the most
common path users take to stock a job: the "Import from Inventory"
modal defaults every candidate's quantity to -1, so every resulting
bin was mislabeled "to be purchased" on the Results tab, and the
"everything is available in stock" message could never appear for
jobs stocked that way.
Track unlimited catalog-sourced lengths in a separate set and check it
first; finite catalog quantities keep the existing decrementing-counter
behavior, and custom-length stock (any quantity) is unaffected.
aj
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