MC-3484: z-index issues with MC-1416

- Added another case

Author: nathanjosiah

app/code/Magento/PageBuilder/view/base/pagebuilder/content_type/text.xml

@@ -52,6 +52,7 @@
                     <item name="parentSelectorsToUnderlay" xsi:type="array">
                         <item name="0" xsi:type="string">.tabs-content</item>
                         <item name="1" xsi:type="string">.column-container</item>
+                        <item name="2" xsi:type="string">.row-container</item>
                     </item>
                 </item>
             </additional_data>