ping @fabpot Let me be more clearer ; this "revert" is done to fix the mentionned bug (which was #7936), but for an unknown reason, for some app, the `PHPSESSID` cookie is never sent (which makes us stuck at 2.2.9).

That is why I tried another approach to solve this bug, without causing the cookie problem : if yiou check if the session is started, instead of just checking the `started` property, it also tests the `closed` property of the SessionStorage.

so this "revert" is still fixing the bug... or it would seems, as I don't have any use case to reproduce it.

Maybe @drak could check up if it seems legit ?