MDL-55744 EDITOR_ATTO: Now atto does not autosave for not loggedin user

lib/editor/atto/lib.php

@@ -180,8 +180,8 @@ class atto_texteditor extends texteditor {
         }
         $contentcss     = $PAGE->theme->editor_css_url()->out(false);
 
-        // Autosave disabled for guests.
-        if (isguestuser()) {
+        // Autosave disabled for guests and not logged in users.
+        if (isguestuser() OR !isloggedin()) {
             $autosave = false;
         }
         // Note <> is a safe separator, because it will not appear in the output of s().