ABC notation library is outdated

[JacekCala]

Is this a hackmd.io issue?

• [x] Yes, the bug happens on https://hackmd.io
• [ ] No. If it's a self-hosted CodiMD instance, please fire up the issue in the repo of CodiMD: https://github.com/hackmdio/codimd

What's the problem

Current behaviour

Try rendering the following small example as abc notation:

T:Minimal example showing the bug
K:C
CD EF
w:line* one
w:line two

Word two appears on the top line, while it should belong to the bottom line; see rendering here: https://hackmd.io/tCiCmcSiQ-qzcTyHNY6LJQ

Expected behaviour

There should be blank between words line and one on the top line (indicated with star), and word two should be at the bottom line.

Additional information

This seems to be a bug in the old version of the abcjs library used by hackmd, currently. To see the correct rendering you can copy and paste the same content to a test editor which uses the latest version of abcjs: https://editor.drawthedots.com/