RFE: more snapshot sorting options: creation time, snapshot hierarchy

[bergentroll]

It is continue of https://bugzilla.redhat.com/show_bug.cgi?id=1859015. I am sorry for duplication, I have troubles with getting access to Bugzilla.

Briefly: snapshots on details window sorted now by name. Creation time seems more reasonable target to sort.

It seems it needs very small changes to do so: the sortname should include creationTime string instead of name. It takes beginning here:

virt-manager/virtManager/details/snapshots.py

Line 455 in a121c94

sortname = "3%s" % name

Also concatenation of digit that is describing type of item with name is really laconic, but seems a bit fragile.

[crobinso]

Thanks for the suggestion. I'm folding some other ideas into this as well, like an option to show the snapshot hierarchy as well, since the work will be in the same area. This was previously discussed at this older bug: https://bugzilla.redhat.com/show_bug.cgi?id=1065077

FWIW I doubt I will change anything here due to time constraints, until external snapshots are at a point that virt-manager can support them, at which point it will require a larger rethink of the UI which can include these improvements