⏫ Forwardport of #12786 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/12786.patch (created by @aschrammel) based on commit(s):
  1. 935dd8d
  2. deffe81

app/code/Magento/Widget/Model/Widget/Instance.php

@@ -34,7 +34,12 @@ class Instance extends \Magento\Framework\Model\AbstractModel
 
     const PRODUCT_LAYOUT_HANDLE = 'catalog_product_view';
 
-    const SINGLE_PRODUCT_LAYOUT_HANLDE = 'catalog_product_view_id_{{ID}}';
+    /**
+     * @deprecated see self::SINGLE_PRODUCT_LAYOUT_HANDLE
+     */
+    const SINGLE_PRODUCT_LAYOUT_HANLDE = self::SINGLE_PRODUCT_LAYOUT_HANDLE;
+
+    const SINGLE_PRODUCT_LAYOUT_HANDLE = 'catalog_product_view_id_{{ID}}';
 
     const PRODUCT_TYPE_LAYOUT_HANDLE = 'catalog_product_view_type_{{TYPE}}';
 
@@ -188,12 +193,12 @@ protected function _construct()
         $this->_specificEntitiesLayoutHandles = [
             'anchor_categories' => self::SINGLE_CATEGORY_LAYOUT_HANDLE,
             'notanchor_categories' => self::SINGLE_CATEGORY_LAYOUT_HANDLE,
-            'all_products' => self::SINGLE_PRODUCT_LAYOUT_HANLDE,
+            'all_products' => self::SINGLE_PRODUCT_LAYOUT_HANDLE,
         ];
         foreach (array_keys($this->_productType->getTypes()) as $typeId) {
             $layoutHandle = str_replace('{{TYPE}}', $typeId, self::PRODUCT_TYPE_LAYOUT_HANDLE);
             $this->_layoutHandles[$typeId . '_products'] = $layoutHandle;
-            $this->_specificEntitiesLayoutHandles[$typeId . '_products'] = self::SINGLE_PRODUCT_LAYOUT_HANLDE;
+            $this->_specificEntitiesLayoutHandles[$typeId . '_products'] = self::SINGLE_PRODUCT_LAYOUT_HANDLE;
         }
     }