MC-22925: Backport template filter strict mode

Author: nathanjosiah

app/code/Magento/Email/Setup/Patch/Data/FlagLegacyTemplates.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Email\Setup;
+
+use Magento\Framework\Setup\ModuleContextInterface;
+use Magento\Framework\Setup\SchemaSetupInterface;
+use Magento\Framework\Setup\UpgradeSchemaInterface;
+
+/**
+ * Upgrade the DB schema for email templates
+ */
+class UpgradeSchema implements UpgradeSchemaInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function upgrade(SchemaSetupInterface $setup, ModuleContextInterface $context)
+    {
+        if (version_compare($context->getVersion(), '2.0.1', '<')) {
+            $connection = $setup->getConnection();
+            $connection->addColumn(
+                $setup->getTable('email_template'),
+                'is_legacy',
+                [
+                    'type' => \Magento\Framework\DB\Ddl\Table::TYPE_BOOLEAN,
+                    'nullable' => false,
+                    'default' => 0,
+                    'comment' => 'Should the template render in legacy mode',
+                ]
+            );
+            $connection->update($setup->getTable('email_template'), ['is_legacy' => '1']);
+        }
+    }
+}

app/code/Magento/Email/Setup/UpgradeSchema.php

@@ -6,7 +6,7 @@
  */
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
-    <module name="Magento_Email" setup_version="2.0.0">
+    <module name="Magento_Email" setup_version="2.0.1">
         <sequence>
             <module name="Magento_Store"/>
             <module name="Magento_Cms"/>

app/code/Magento/Email/etc/db_schema.xml

@@ -31,6 +31,21 @@ public function upgrade(SchemaSetupInterface $setup, ModuleContextInterface $con
             );
         }
 
+        if (version_compare($context->getVersion(), '2.0.2', '<')) {
+            $connection = $setup->getConnection();
+            $connection->addColumn(
+                $setup->getTable('newsletter_template'),
+                'is_legacy',
+                [
+                    'type' => \Magento\Framework\DB\Ddl\Table::TYPE_BOOLEAN,
+                    'nullable' => false,
+                    'default' => 0,
+                    'comment' => 'Should the template render in legacy mode',
+                ]
+            );
+            $connection->update($setup->getTable('newsletter_template'), ['is_legacy' => '1']);
+        }
+
         $setup->endSetup();
     }
 }