inventory Amend "out of stock" logic to account for unfulfilled orders properly

Description (*)

I would like to request that the logic governing how and when a product's source item status is set to out of stock is changed.

I believe this should happen as the saleable qty hits 0, not when the source qty does.

Currently, if an order reserves the last of the stock of a particular SKU, that sku's source item status remains in stock until the order is shipped, and the source qty is reduced to 0. here is an example product from our store. this was ordered, reducing the saleable qty to 0, 3 weeks ago, but remained in stock until today.

In the interim between the order being placed and shipped, the frontend of magento displays this item as in stock, but unpurchaseable. This is further exacerbated by being in a configurable product, where the product will show the overall stock when selected, instead of the individual stock, leading to further confusion and customer service time wasted. this appears to be a genuine bug, and I will log it as such.

If an order is delayed in any way, this can mean a product is in this limbo state for ages, until an admin manually sets it to out of stock, which has further issues if that order is then cancelled rather than shipped/completed. Then the SKU remains out of stock while the source qty and saleable qty are > 0.

even without out of the ordinary delays, if an order can't be dispatched over a long holiday weekend for example, that's up to 4 days that the stock is displaying incorrectly on the store, and causing customer service requests/annoying customers away from the business.

Expected behavior (*)

add a mechanism to the reservation system to check: source quantity - quantity required for order +/- out of stock threshold and if this results in <=0, set souce item status to out of stock

and then add a secondary check for when an order is cancelled/fails to put the source item status back to in stock on the creation of the order place failed or order refunded reservations to avoid the sku staying out of stock while having saleable qty of > 0

Benefits

would make the frontend/customer experience more seamless, and lead to fewer customer service gripes for products that appear to be in stock when they aren't.