Possible edition duplicates should only appear when they are derived from the same work

If we add a new edition, at the moment each edition with the same name from the author appears as a possible duplicate, even if they are derived from different works.

In this case an edition of the English original is shown, while I’m adding an edition of a German translation with the same title.

Since editions from different works can’t be identical, they don’t have to be shown.
Just imagine works like “Othello” or “Hamlet” with many different translations in different languages - all with the same title - this won’t work well :wink: