MDL-52954 assign: Rebuild the assignment single grade page.

mod/assign/feedbackplugin.php

@@ -167,6 +167,15 @@ abstract class assign_feedback_plugin extends assign_plugin {
         return '';
     }
 
+    /**
+     * Supports injecting content into the review panel of the grading app.
+     *
+     * @return bool True if this plugin will add content to the review panel of the grading app.
+     */
+    public function supports_review_panel() {
+        return false;
+    }
+
     /**
      * Show a batch operations form
      *