I had the same when I ported the gruvbox theme (that was for vim) to emacs. I used the same license and also added full credit, since the elisp was mine but the

I had the same when I ported the gruvbox theme (that was for vim) to emacs. I used the same license and also added full credit, since the elisp was mine but the selection of colours wasn't. One contributor decided to fork straight away and then link to it in an issue rather than adding a pull request. Eh, whatever, I didn't like it so much at the time but we came to an agreement, and the person who forked did a great job maintaining the theme. It became popular enough that some more prolific emacsers caught wind, and the project became more integrated. As you might know, emacs is hardcore GPL, so this basically demanded a relicense. This was a few years after I started the project back in 2013 (I think), but I got pinged on the issue and messaged privately, and that was enough. Turns out it wasn't necessary at the end of it all, but the process was quick and easy. Everything was cordial and I still have my name attached to it, which I guess is nice.