MC-2370: Implement full width layout for product

- Use result page plugin to apply default class

Author: davemacaulay

app/code/Magento/PageBuilder/Plugin/Result/Page.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\PageBuilder\Plugin\Result;
+
+use Magento\Framework\App\ResponseInterface;
+use Magento\Framework\View\Element\Context;
+use Magento\Framework\View\Result\Page as ResultPage;
+
+class Page
+{
+    /**
+     * @var \Magento\Framework\View\Element\Context
+     */
+    private $context;
+
+    /**
+     * @param Context $context
+     */
+    public function __construct(
+        Context $context
+    ) {
+        $this->context = $context;
+    }
+
+    /**
+     * @param ResultPage $subject
+     * @param ResponseInterface $response
+     * @return array
+     */
+    public function beforeRenderResult(
+        ResultPage $subject,
+        ResponseInterface $response
+    ) {
+        // Apply the updated layout handles classes to the body when using our full width variants
+        if ($subject->getConfig()->getPageLayout() == 'product-full-width') {
+            $subject->getConfig()->addBodyClass('page-layout-1column');
+        }
+
+        return [$response];
+    }
+}

app/code/Magento/PageBuilder/etc/frontend/di.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <type name="Magento\Framework\View\Result\Page">
+        <plugin name="pageLayoutDefaultClass" type="Magento\PageBuilder\Plugin\Result\Page"/>
+    </type>
+</config>

app/code/Magento/PageBuilder/view/frontend/page_layout/product-full-width.xml

@@ -8,9 +8,6 @@
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_layout.xsd">
     <update handle="1column" />
 
-    <!-- Ensure the 1column page layout class is present in the DOM -->
-    <referenceContainer name="page.wrapper" htmlClass="page-wrapper page-layout-1column"/>
-
     <referenceContainer name="page.wrapper">
         <!-- Create new product details wrapper under main.content for tabs section -->
         <container name="product.info.details.wrapper" after="main.content" htmlTag="div" htmlClass="page-main page-main-details">