Hi mate,
I'm new to the mame contrib world.
Anyway, as software engineer could say, usually reviewers want the pull request to be aligned with main branch version, without conflict.

May be, you can try to get it aligned, and ask again for a merge.

Hello guys, I'm a software engineer and I'm following Mame from 2007. I've studied documentation, code and tutorial, many times and I've reached a good understanting, but have never had much time to contribute. Now I want to start to begin to do a further step in rom understanding and mame programmi...