Given that we bumped deps to fairly modern distros with the
python3 change, I think this is safe. gtk 3.22 is from sep 2016, it's
in debian9 and fedora 25+, which seems fine for our needs.
We need to bump the gtk dep to at least 3.10 for GtkRevealer usage,
and I want to bump the pygobject higher to drop some bug workarounds.
But since the oldest thing I have that meets those requirements is
RHEL/Centos 7.3 which is at 3.14 for both, set those as the minimum
versions since that's what I'll be testing against. They are still
1.5 years old and only a bit over a year newer than the previous
versions, so it's not a huge change.
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.