It would be helpful to me if the song were numbered relative to the filter. It’s not a huge deal and I can often use the track numbers if they are consistent, but it might be more helpful if the numbers were indexed based on the visible songs and not the total loaded songs.
Relative song numbers
I don’t think this is a good idea, I think better to keep the recnos stable so that they never change for a particular song during an editing session regardless of what filters are on.
Okay, after I posted it I thought that maybe it would be difficult and probably also a lot of effort since you probably use those song numbers throughout the code.