(In reply to Guo, Zhiyi from comment #0)
> Description of problem:
> qemu-kvm has supported copy/paste in the vnc console since qemu-kvm 6.2.0,
> see:
> Bug 1874926 - [RFE] copy/paste support in qemu VNC console
> 
> Beside Libvirt, virt-viewer should also support this feature.
> 
> 
> Steps to Reproduce:
> 1.Start VM with VNC has copy/paste enabled, use virt-viewer connect to VM
> vnc port
> 2.Try to copy some characters from client machine and paste them to VM
> 3.Try to copy some characters from VM and paste them to client machine
> 
> Actual results:
> copy/paste in step 2 and 3 doesn't work
> 
> Expected results:
> copy/paste works good
> 
> Additional info:
> I have checked virt-viewer-11.0-1.el9.x86_64 and copy/paste doesn't work. As
> a reference, vncviewer provided by tigervnc-1.11.0-21.el9.x86_64 has
> copy/paste works

I've only done a cursory investigation so far, but I suspect that there may need to be some work done in gtk-vnc as well. One potentially significant difference between vncviewer/tigervnc and virt-viewer is that vncviewer sends a SetEncodings[1] message to the server when it connects, and this message includes the pseudo-encoding value 0xc0a1e5ce[2], which causes qemu to enable some clipboard-related functionality. 

[1] https://datatracker.ietf.org/doc/html/rfc6143#section-7.5.2
[2] https://gitlab.com/qemu-project/qemu/-/blob/1d60bb4b14601e38ed17384277aa4c30c57925d3/ui/vnc.h#L425

(In reply to Jonathon Jongsma from comment #2)
> I've only done a cursory investigation so far, but I suspect that there may
> need to be some work done in gtk-vnc as well. One potentially significant
> difference between vncviewer/tigervnc and virt-viewer is that vncviewer
> sends a SetEncodings[1] message to the server when it connects, and this
> message includes the pseudo-encoding value 0xc0a1e5ce[2], which causes qemu
> to enable some clipboard-related functionality. 

That is the extended clipboard protocol:

  https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#extended-clipboard-pseudo-encoding

GTK-VNC does not implemenet that extension at this time. It only supports the original crude clipboard protocol 

  https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#clientcuttext
  https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#servercuttext

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.

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