"Copy link to your booklet" option appears even for links in your booklet

Using it generates an error "You already have this link in your booklet". This is disharmonious.

This is a pain in the butt due to how the pane is handled. You can select an alternate dest instance and copy the link, right? That's useful. (If you can't do it, you should be able to!) But this implies that the "copy link" option can be enabled or disabled as you flip through the instance menu.
