Hi Christian,

> I found some odd behavior, sometimes it would seem as if my copy would not 
> work.
> Pasting then would paste "nothing" later on if I copy something again it 
> would "free up" and unblock all old calls, suddenly pasting all of them.
> 
> Example
> text editor with:
> aa
> bb
> cc
> Then I copy "aa" but the system locks up.
> I go to the next line and try to paste it three times (nothing happens).
> Then I copy "bb" which "unblocks" the system.
> The three times "aa" paste now appear at once.

This is exactly is the problem. And it's happening both in guest and the
host when the virt-manager window is opened. You can notice that very
soon when you keep a virt-manager window opened and start for example
coding in the host. After a few Ctrl+x / Ctrl+v you realize that your
clipboard is broken and you need to close virt-manager (workaround is to
close virt-manager but then you can't use the VM...).

I didn't notice the problem in Ubuntu 20.04 (GNOME) as host. At this
moment I'm running Kubuntu 20.04 (KDE Plasma) as the host and I'm
noticing the clipboard issues with both Kubuntu (Plasma) and Ubuntu
(GNOME) guests.

@Christian: Thank you very much Christian for triaging and testing ;-).

@Desktop: Big shout-out to your team and to the new team lead @Wimpy.
Please let me know if you have any questions ;-). Thank you!

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1872527

Title:
  Clipboard doesn't work 100% of the time in Ubuntu 20.04 (in KVM
  guests)

Status in mutter package in Ubuntu:
  New
Status in virt-manager package in Ubuntu:
  Invalid

Bug description:
  I'm testing Ubuntu 20.04 LTS (Focal Fossa) Beta.

  I installed Kubuntu 20.04 and virt-manager as I did many times on
  Ubuntu 18.04. Unfortunatelly when I run a VM (QEMU-KVM, libvirt,
  libspice-server1 and spice-vdagent) with another Kubuntu 20.04 guest
  or with Ubuntu 20.04 guest then clipboard doesn't work right.

  To test it, please install Kubuntu 20.04 and then install Kubuntu /
  Ubuntu 20.04 as VM (guest). Open some simple text editor and start
  Ctrl + C and Ctrl + V plain text. 90% of time it will work and 10% of
  time it won't.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: virt-manager 1:2.2.1-3ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Mon Apr 13 15:02:22 2020
  InstallationDate: Installed on 2020-04-09 (4 days ago)
  InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200401)
  PackageArchitecture: all
  SourcePackage: virt-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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