Merge pull request #6751 from magento-tsg/MC-40738

[Arrows] MC-40738: [MSI] “Add to Compare” function is not available if a Product is unavailable in the “Default Source” or unassigned from it.

Author: zakdma

app/code/Magento/Catalog/ViewModel/Product/Checker/AddToCompareAvailability.php

@@ -7,10 +7,10 @@
 
 namespace Magento\Catalog\ViewModel\Product\Checker;
 
-use Magento\Framework\View\Element\Block\ArgumentInterface;
 use Magento\Catalog\Api\Data\ProductInterface;
-use Magento\CatalogInventory\Api\StockConfigurationInterface;
 use Magento\Catalog\Model\Product\Attribute\Source\Status;
+use Magento\CatalogInventory\Api\StockConfigurationInterface;
+use Magento\Framework\View\Element\Block\ArgumentInterface;
 
 /**
  * Check is available add to compare.
@@ -39,25 +39,9 @@ public function __construct(StockConfigurationInterface $stockConfiguration)
     public function isAvailableForCompare(ProductInterface $product): bool
     {
         if ((int)$product->getStatus() !== Status::STATUS_DISABLED) {
-            return $this->isInStock($product) || $this->stockConfiguration->isShowOutOfStock();
+            return $product->isSalable() || $this->stockConfiguration->isShowOutOfStock();
         }
 
         return false;
     }
-
-    /**
-     * Get is in stock status.
-     *
-     * @param ProductInterface $product
-     * @return bool
-     */
-    private function isInStock(ProductInterface $product): bool
-    {
-        $quantityAndStockStatus = $product->getQuantityAndStockStatus();
-        if (!$quantityAndStockStatus) {
-            return $product->isSalable();
-        }
-
-        return $quantityAndStockStatus['is_in_stock'] ?? false;
-    }
 }