On Preview/Diff/Save, the wikitext editor should check for a badtoken event that says that a previously logged-in user is now logged out, and should warn the user. This would help reduce the number of "OMG I was logged out please OS this edit" requests and generally be nice for users.
Version: 1.22.0
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=48775