Stock status not coming back after qty update

[orozcodiaz]

Preconditions

1. Magento Version: 2.1.3
2. PHP: 7.0.14-2a
3. MySQL: 5.6.33
4. Automatically Return Credit Memo Item to Stock (this is what I try to achieve) - ON (Stores - Configuration - Catalog - Inventory)

Steps to reproduce

1. Set simple product qty to zero (and you will see it will turns to Out of Stock) & hit Save
2. Set same product qty to 1 and save

Expected result

After insert qty more than zero - changed new stock status In Stock

Actual result

Still Out of Stock

[LucScu]

Same issue when with a credit memo you return to stock a product correclty went out of stock with qty 0.
It increases its qty, but it remains in out of stock state, so i have to cron a script all night that put in stock all products out of stock with qty > 0.
Absolutly crazy.

[RomanKrut]

@oroskodias Thanks for reporting this issue, internal ticket was created MAGETWO-70370.

[ragboyjr]

It looks like the specific code is right here:

magento2/app/code/Magento/CatalogInventory/Model/Stock/StockItemRepository.php

Lines 165 to 167 in 9c14af7

	if ($stockItem->getManageStock() && !$isInStock) {
	$stockItem->setIsInStock(false)->setStockStatusChangedAutomaticallyFlag(true);
	}

I think the easiest way to fix is if we added another if statement below like:

if ($stockItem->getManageStock() && $isInStock && !$stockItem->getIsInStock()) { 
    $stockItem->setIsInStock(true)->setStockStatusChangedAutomaticallyFlag(true);
}