Show a screenshot in the 'new snapshot' wizard. If we successfully create
that snapshot, save the screenshot in
~/.cache/virt-manager/$connuri/$vmuuid/snap-screenshot-$snapname.$ext
And show it in the snapshot details overview. We don't do any reaping
on snapshot delete, vm delete, etc, but that could be added later.
We sort them separately in the snapshot list, explicitly mention that
they are 'external', and add a UI field listing the memory/disk
details.
In general mixing internal and external snapshots is a recipe for
confusion and disaster, so I think the best thing to do is at least
acknowledge their presence in the UI but not make any attempt to
predict what will or will not work.
Cole Robinson