Re: `\paper`-only variables

[Werner LEMBERG]

>> I'm working on issue
>> https://gitlab.com/lilypond/lilypond/-/issues/1392 (but not for the IR
>> but as an appendix for the NR) and I would like to avoid writing the
>> sentence
>> 
>>  `foo` may also be specified in `\layout` blocks
>> 
>> again and again.  I could imagine that the opposite, namely
>> 
>>  `foo` has no effect if added to a `\layout` block
>> 
>> would be better.
> 
> Honestly, I think the best would be to work towards reducing or
> completely eliminating the \paper/\layout distinction.

I couldn't agree more.

> For me at least, it's incomprehensible. I mean, generally speaking,
> \layout affects only music while \paper affects paper, page layout
> and music, but the implementation is muddled enough that I cannot
> even tell if this rule is absolute or not. (For example, I don't
> remember off the top what we do with \markup \score.)

Is this your next bigger LilyPond cleanup project? :-)

I will remove the per-variable description and add something more
general to the beginning of the appendix section.


    Werner