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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Side mouse buttons currently do not exist in the protocol, causing them to be inexplicably ignored by VMs in virt-manager and such. This lays the groundwork for fixing that issue.
I have also already implemented this in spice-server, spice-gtk and the Linux vd-agent. I plan on submitting MRs for those projects as well if this is accepted.