Hack:
I was wondering about something similar too, but from the "xl save" and
"xl restore" angle. e.g. by inroducing "save" and "restore" buttons and
a new VM state in the VM manager. I think something like this would
satisfy the same needs, but would be independent of the OS or desktop
environment. It would probably be harder to implement though. I don't
know if anything like this has been proposed already.
Something similar has been proposed, but it refers to "inactive" VMs
rather than saving on demand.
https://github.com/QubesOS/qubes-issues/issues/832
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