Add arrow to custom gliss stencil

[dtsmarin]

Hi,

I'm using this snippet http://lsr.di.unimi.it/LSR/Snippet?id=1066 but I want
to add an arrow at its right edge. Unfortunately LP's default code for that
purpose: 
\once\override Glissando.bound-details.right.arrow = ##t
doesn't work so I need some help to figure out how to add the arrow
manually.



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