ENGCOM-2064: [Forwardport] Variant product image in sidebar wishlist block #15698

 - Merge Pull Request #15698 from dmytro-ch/magento2:2.3-develop-PR-port-15477
 - Merged commits:
   1. eea948d
   2. fb913ad

Author: magento-engcom-team

app/code/Magento/Wishlist/CustomerData/Wishlist.php

@@ -149,6 +149,14 @@ protected function getItemData(\Magento\Wishlist\Model\Item $wishlistItem)
      */
     protected function getImageData($product)
     {
+        /*Set variant product if it is configurable product.
+        It will show variant product image in sidebar instead of configurable product image.*/
+        $simpleOption = $product->getCustomOption('simple_product');
+        if ($simpleOption !== null) {
+            $optionProduct = $simpleOption->getProduct();
+            $product = $optionProduct;
+        }
+
         /** @var \Magento\Catalog\Helper\Image $helper */
         $helper = $this->imageHelperFactory->create()
             ->init($product, 'wishlist_sidebar_block');