Re: Issue 2376 in lilypond: Automatic footnotes on \null markups causes unexpected results

[lilypond]

Comment #3 on issue 2376 by address@hidden: Automatic footnotes on \null  
markups causes unexpected results
http://code.google.com/p/lilypond/issues/detail?id=2376

You're right that it's invasive, but that doesn't bother me, as I think the  
change is more coherent w/ how LilyPond handles stencils in general.

If the empty stencil can be somehow made copy-on-write. that'd be great.   
I'm not sure how to do that w/ Scheme objects, thus the change proposed in  
this patch.