Magento2: Admin classes being used on the frontend

[BenSpace48]

The recently viewed widgets template contains admin classes that render on the front-end, no admin classes should be used on the front-end as they're intended to be admin specific.

Preconditions

1. Magento 2.2.3 EE

Steps to reproduce

1. Create a static block
2. Include a widget to render the recently viewed products. The code generated for me is {{widget type="Magento\Catalog\Block\Widget\RecentlyViewed" uiComponent="widget_recently_viewed" page_size="6" show_attributes="image" show_buttons="add_to_cart" template="product/widget/viewed/grid.phtml"}}
3. Call this static block anywhere, I added the following code to default.xml:

<block class="Magento\Cms\Block\Block" name="recently.viewed.widget">
    <arguments>
        <argument name="block_id" xsi:type="string">recently-viewed</argument>
    </arguments>
</block>

1. Once rendered on the front-end you'll see the classes admin__data-grid-outer-wrap and admin__data-grid-loading-mask as they're hardcoded inside vendor/magento/module-ui/view/base/ui_component/templates/listing/default.xhtml:9

Expected result

1. Elements should use classes consistent with the rest of the front-end

Actual result

1. Classes contain references to the admin

[ghost]

HI @BenSpace48 thank you for your report. Please follow these guidelines for proper tracking of your issue. You can report Commerce-related issues in one of two ways:
You can use the Support portal associated with your account
or
If you are a Partner reporting on behalf of a merchant, use the Partner portal.

GitHub is intended for Magento Open Source users to report on issues related to Open Source only. There are no account management services associated with GitHub.

[BenSpace48]

I believe this is a bug hence why I am raising it here, when users create a recently viewed widget there should not be admin files loading on the front-end. Recently viewed is also available in open source isn't it?

[BenSpace48]

@engcom-backlog-nazar if you refuse to resolve the issue can you at least explain why admin files are loading on the front-end?

[ghost]

@BenSpace48 ok. Its reproduce on Ce version, but remove EE lable and set the CE
thank you for your report.
We've acknowledged the issue and added to our backlog.

[CompactCodeEU]

Can we have the push request here please? So we can fix this in earlier versions?

[CompactCodeEU]

For those wondering... If you just fill in the template with the same path it will take the frontend html
Example for a frontend checkbox arguments :

            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="formElement" xsi:type="string">checkbox</item>
                    <item name="source" xsi:type="string">your_source</item>
                    <item name="default" xsi:type="number">1</item>
                    <item name="template" xsi:type="string">ui/form/element/checkbox</item>
                </item>
            </argument>

This will also not break on the update when they fix what is causing it taking the base template instead of the frontend template

[luukschakenraad]

@engcom-backlog-nazar Any progress on this issue? It's still a problem in Magento 2.3.2