- don't apply this patch
- login to the Admin Console
- enable to DBG_REDIRECT in the /system/debug.php (assuming, that Debug Mode is enabled as well)
- press the Logout link in the top frame
- confirm, this SQL is present in the Debugger Report:
DELETE FROM UserSessionData WHERE SessionId = '' AND VariableName = 'priority_deleted';
- click on the link, that DBG_REDIRECT shown instead of a page content
- click on the link, that DBG_REDIRECT shown instead of a page content
- confirm, that the Admin Login page is displayed
- apply the patch
- login to the Admin Console (click on the any DBG_REDIRECT shown links as needed)
- press the Logout link in the top frame
- confirm, that SQL, that removes the priority_deleted session variable has disappeared