Again, my request is for a barline editor, so that for example I can make very thick single barlines, and some odd ones, and not have to edit the existing choices as people are immediately going to say, which has multiple disadvantages.
I was happy to finally get double thick, as I requested for ages, as commonly used by Haydn. But let’s go further. A lot of contemporary music has a wide range of barline objects.
This is possible in Lilypond. Anything Lilypond does, we can do better 