Comment 5 for bug 1727042

I'm unable to help you regarding coding.

Just, unlike graphic root privileges (Synaptic, Gparted) or modifying screenshot selection on the screen (Shutter), perhaps this is not due to a Wayland security restriction : I just installed and tested Copyq and it works for the clipboard history.

So perhaps the source could let you understand the issue :
https://github.com/hluk/CopyQ

Nevertheless, thanks for having taken time to look at this bug, I appreciate Diodon a lot !