Re: Extend Whiteout property

[Lukas-Fabian Moser]

Hi Urs,

thanks for all the detailed explanations!

> So it would be nice if someone with the C++ knowledge could have a 
> look at https://github.com/lilypond/lilypond/pull/3 and comment on it 
> there.
> Note: the goal is not to merge the branch into the Github mirror but 
> only to provide review. Once there is agreement on the code someone 
> should sheperd the patch through the regular review process.

I just might add that, I think, the C++ part of the changes is almost 
"trivial" (one had to make sure that the stencil-whiteout gets activated 
not only for boolean- or number-valued 'whiteout' property, but for 
pairs [of numbers] as well). The real work is all scheme, namely in 
scm/stencil.scm.

Best
Lukas