Automatically centering markup along an arrow

[Sam Bivens]

Hi all,

I've recently discovered Harm's terrific arrow markup; see attached. Is there any way to automatically center new markup along these paths instead of manually tweaking an halign for every one?

In other words, the "X" in the attached MWE should automatically center itself between the endpoints of the slur/arrow. How might this be possible?

Thanks!

Sam

arrow-mwe.ly
Description: Text Data

harm-arrows.ily
Description: Binary data