Add option to disallow self-referencing

[j-stechmann]

Hi,

I've had an issue with a client that accidentally self-referenced an entry.
We have the menu on this site set up so that if an entry had a specific entry type, we would get the url of the linkfield within that entry, eliminating a redirection (and enabling some other cool things).

Since the client chose the same entry the field was being saved in, the website became non-functioning.

Maybe I should check for a recursion, but I thought it might be a good idea to prevent the user from making that mistake in the first place 🙂

Would it be possible to add a field setting which disallows self-referencing?

I'm running CraftCMS 4.2.8 and linkfield 2.1.4.