MASTER Log in as admin and go to Calendar. Click New event button. On the form, add a title, click Show more and add an image as description. Save and click  New event button again. Click Show more and make sure the field is empty and the content of previous event was not restored. Go to Site administration > Plugins > Text editors > Atto HTML editor > Atto toolbar settings Change editor_atto | autosavefrequency setting to 5 seconds. Go back to Calendar, click New event button, click Show more and add something to description field (wait 5 seconds) Make sure it does not save the draft after that period. Add the event and click to add another one. Make sure it does not restore the draft from your previous event. 3.3 AND 3.2 Log in as admin. Go to Site administration > Plugins > Text editors > Atto HTML editor > Atto toolbar settings Change editor_atto | autosavefrequency setting to 5 seconds. Open calendar/lib.php and search for $editoroptions array (line 180 on 3.3 and line 1975 on 3.2) and add another item to array 'autosave' => false protected $editoroptions = array( 'subdirs' => false, 'forcehttps' => false, 'maxfiles' => -1, 'maxbytes' => null, 'trusttext' => false, 'autosave' => false ); Now on the calendar UI, click New event button and type something on the description field. Make sure it does not save the draft after 5 seconds. You can revert the commit of those branchs and notice the draft will be saved even if you add 'autosave' => false to the array.