In a system where users must be logged in to edit, if an edit form is submitted
beyond the expiry period, the full text (with the attempted edit incorporated) is displayed.
However, there is no way to continue the edit without:
- Manually copying the text
- Logging in
- Returning to the edit screen
- Pasting it
This may occur if someone has spent too long editing and is
unaware of the pending expiry.
Compare to the same situation (being logged out due to session expiry) on a wiki
that allows logged-out edits. Per the comments, you can log in on another tab or window,
then just click Preview in the tab where you were working, to restore your edit flow.