That's an interesting idea.
I tried to fix the
In Collection +
In Wishlist but it does what it's supposed to do: list titles in both Collection OR Wishlist, which is not very useful.
It's using the title or reference search field which is probably not what you have in mind. I suppose we should rather match exact releases together.
I'll add a specific link on both front-ends -- same result but the ability to delete from the collection's or the wishlist's side:
- Both in Collection and Wishlist
- Both in Wishlist and Collection
Julien