Odp: How to prevent slur from breaking?

[Karol Majewski]

OK, so I've tried:

\alterBroken transparent #'(#f #t) Slur

and it works quite well. The only problem is that transparent object is still 
there, therefore takes space. Better solution would be:

\alterBroken stencil #'(#t #f) Slur

But It doesn't work...