TYPO3 Core

If you are editing content within the alt_doc.php page, and then you go away from your computer and lost your session, when you came back and want to save your work, on the button save click, the system ask you to login. That's correct for the moment because we lost the session.
Then you log in, the login window get closed, you press the save button, and here, it asks you to log in a new time !
It means that the new session is not detected.
To sum up, when you save, the window tells "Want to log in ?" you must say YES for the first time, then click once again on the save button, same question "Want to log in ?", then now you have to say NO to continue the normal process.

(issue imported from #M2523)