Earlier versions of EndBASIC had line numbers for the program contents and they came with RENUM and AUTO. When I added the full-screen editor, I removed those because the editor obsoleted them and the program lines didn't have any meaning. But... I find the lack of line numbers to be a deficiency for the kind of experience I want EndBASIC to offer.

So. We need to put line numbers back. But they must play well with the editor too, which must stay.

Shouldn't be too hard... unless we add line-based GOTOs, which we should have too, because then RENUM must understand them...