Glissando stems

[Mark Knoop]

Following on from this old thread...

https://lists.gnu.org/archive/html/lilypond-user/2019-10/msg00405.html

... I'm using Harm's fantastic code to align/attach Stems to a Glissando line.

However, I've come across a problem with the code which in relation to 
MultiMeasureRests. Namely, writing a MMR which will appear on the same system 
as the Glissando (or some other situations) results in an error:

ERROR: In procedure ly:item-get-column: Wrong type argument in position 1 (expecting 
Item): #<Grob Spanner >

Attached is Harm's original code with a few lines added to the example (at line 
595) which demonstrate the problem.

Many thanks,

Mark

glissando-stems-06-with-mmr.ly
Description: Text document

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Mark Knoop