If Install tool session expires, all ajax requests fail
- Open "Maintenance" module
- Go drinking a coffee and return after an hour
- Click "flush caches"
Install tool session lasts as long as backend session
Install tool session is limited to 60 minutes, even if backend session is configured to be longer and maintenance module is called from backend session
Currently, when accessing the install tool from the backend, a session for standalone install tool is created as well,
thus install tool can be opened in standalone context. It also means that install tool is unlocked and accessible for other requests as well.
When accessing the install tool from the backend, the install tool session should be shared with the backend session and be independent from a standalone session