Add configuration to allow not replacing the 'Content' field to enabl…

…e backwards compatibility with older content blocks modules.

src/Extensions/ElementalAreasExtension.php

@@ -71,6 +71,14 @@ class ElementalAreasExtension extends DataExtension
      */
     private static $sort_types_alphabetically = true;
 
+    /**
+     * Whether or not to replace the default SiteTree content field
+     *
+     * @var boolean
+     * @config
+     */
+    private static $replace_content_field = true;
+
     /**
      * Get the available element types for this page type,
      *
@@ -170,7 +178,9 @@ public function updateCMSFields(FieldList $fields)
 
         // add an empty holder for content as some module explicitly use insert
         // after content.
-        $fields->replaceField('Content', new LiteralField('Content', ''));
+        if (Config::inst()->get(ElementalAreasExtension::class, 'replace_content_field')) {
+            $fields->replaceField('Content', new LiteralField('Content', ''));
+        }
         $elementalAreaRelations = $this->owner->getElementalRelations();
 
         foreach ($elementalAreaRelations as $eaRelationship) {