CE 2.1.7 Attributes - Display Out of Stock Products

[stroblee]

Preconditions

1. Magento CE 2.1.7
2. Apache 2.4.27
3. PHP 7..0.22
4. Varnish 4.1.8

Steps to reproduce

1. Install Magento 2.1.7 CE Sample Data
2. Admin > Stores > Configuration > Catalog > Inventory > Stock Options > Display Out of Stock Products = Yes.
3. CLI php bin/magento indexer:reindex
4. Admin > Products > Catalog > Breathe-Easy Tank-XS-Puple, Breathe-Easy Tank-XS-White, Breathe-Easy Tank-XS-Orange. Set either Quantity = 0 or Stock Status = Out of Stock.
5. CLI php bin/magento cache:clean

Expected result

1. Frontend product - Breathe-Easy Tank. The swatch attribute Size XS' should display with class disabled (red strike through) for all Simple products part of Configurable product.

Actual result

1. Frontend product - Breathe-Easy Tank. The swatch attribute Size XS not displayed at all.

Other Information

1. If one Simple product from Configurable options, i.e. Breathe-Easy Tank-XS-Puple, Breathe-Easy Tank-XS-White, Breathe-Easy Tank-XS-Orange has either Quantity => 1 or Stock Status = In Stock then the remaining out of stock products will display the swatch attribute 'Size XS' with class disabled (red strike through) for all Simple products part of Configurable product.

[dankocherga]

The issue seems to be in a way how Magento retrieves products for showing as a configurable options.

In the Magento\ConfigurableProduct\Block\Product\View\Type\Configurable:: getAllowProducts method it checks for the getSkipSaleableCheck flag which is false and only set to true during admin checkout.

Since the flag is false, it goes down to the Magento\ConfigurableProduct\Model\Product\Type\Configurable::getSalableUsedProducts where stock status is always validated.

In other words, "Display Out of Stock Products" configuration does not make any difference in building configurable product options.