correction bug annotation draft mutlipage

classes/page_editor.php

@@ -252,7 +252,7 @@ class page_editor {
     public static function set_annotations($gradeid, $pageno, $annotations) {
         global $CFG, $DB;
 
-        $annotationsRelease = $DB->get_records(self::BDDTABLEANNOTATION, array(self::GRADEID => $gradeid, self::DRAFLIB => 1));
+        $annotationsRelease = $DB->get_records(self::BDDTABLEANNOTATION, array(self::GRADEID => $gradeid, 'pageno' => $pageno, self::DRAFLIB => 1));
 
         $added = 0;
         if (!$annotationsRelease || sizeof($annotationsRelease) == 0 || $CFG->preserve_student_on_update == 0) {
@@ -302,7 +302,6 @@ class page_editor {
         return $added;
     }
 
-
     /**
      * create an annotation for a draft
      * @param annotation|record $annotationRecord annotation to create