Getting a property from *antoher* grob in callback

[Urs Liska]

Hi all,

I'm creating a stencil (Slur) for compound slurs. WIthin that function
(define-event-function) I'd like to access a property from a certain
grob and don't know how to do that.

I need to determine the thickness of a line through the grob property
'thickness. But a slur's thickness (which I can retrieve) is taken as a
factor of Staff.StaffSymbol.thickness. So in order to match the line
thickness with that of regular slurs I need to access that StaffSymbol's
property.

How can I access a grob property if I don't have the actual grob
available (i.e. the reverse of \override)?

TIA
Urs


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