Issue with configurable products in widgets, not added to cart

[jcourtei]

Preconditions (*)

Version 2.2.6 (Community Edition).

Steps to reproduce (*)

1. Create a product attribute, for example Size with several values (S, M and L). This attribute must have property "use in product listing" set to Yes.
2. Create a product that uses this attribute with a configuration setting. Define different quantities for each values. Set this product as new for the current month.
3. Create a block with a widget for new products (choose the grid template) and add this block at any page.
4. On this page click on Add to cart (from a computer, not smartphone) for this new product.

Expected result (*)

User should see the product page with the message "You need to choose options for your item."

Actual result (*)

User is redirected to the cart page and the product is not added to the cart.

I think the issue is in vendor/magento/module-catalog/view/frontend/templates/product/widget/new/content/new_grid.phtml.
I replaced :
<?php if ($_item->getTypeInstance()->hasRequiredOptions($_item)): ?>
with :
<?php if (!$_item->getTypeInstance()->isPossibleBuyFromList($_item)): ?>
This way it is consistent with Magento\Catalog\Block\Product\AbstractProduct->getAddToCartUrl(), since this method uses isPossibleBuyFromList() to choose the url.

Several templates are concerned with this issue :

• vendor/magento/module-catalog-widget/view/frontend/templates/product/widget/content/grid.phtml (for the widget "Catalog Products List")
• vendor/magento/module-catalog/view/frontend/templates/product/widget/new/content/new_grid.phtml (for the widget "Catalog New Products List" with "New Products Grid Template")
• vendor/magento/module-catalog/view/frontend/templates/product/widget/new/content/new_list.phtml (for the widget "Catalog New Products List" with "New Products List Template")
• vendor/magento/module-catalog/view/frontend/templates/product/widget/new/column/new_default_list.phtml (for the widget "Catalog New Products List" with "New Products Images and Names Template")

[magento-engcom-team]

Hi @jcourtei. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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@jcourtei do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[orlangur]

@jcourtei suggested code changes can be provided directly as pull request. Thanks for bug report!

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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[magento-engcom-team]

@engcom-backlog-nazar Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-96575, MAGETWO-96576 were created