[pabs3]

Not too much support out there, but at least some important things do:

https://codesearch.debian.net/search?q=x-kde-passwordManager...

[heavyset_go]

At least in my experience, it works with the password and clipboard managers I use, and even some command-line utilities like wl-clipboard.

Wish it was a protocol-level setting, though, instead of something KDE specific and honored at the application level.