two issues on LSR

[Till Rettig]

Hi Valentin,

I tried updating the snippet I posted (about ancient incipit), but I 
can't edit it, I don't know what the mistake is.

Then I have another thing here, a "workaround" from the list about one 
year ago. It is about marking the notes of spoken parts with a cross on 
the stem. It is not a good trick, though, because it adds also crosses 
to the invisible stems of rests, as the example shows. A workaround is 
to end the cross sections when rests come, but this can be really 
annoying. There is also a comment, that Han-Wen actually suggested then 
to use another function to apply the cross, but I couldn't find anything 
about his and couldn't figure out how to use it.
You can maybe say if it is worth adding to LSR.

%%%%Begin example
%HW: use grob-interpret-markup function!
sp = { \override Voice.Stem #'stencil = #(lambda (grob)
          (ly:stencil-combine-at-edge
            (ly:stem::print grob) 1 (* -1 (ly:grob-property grob 
'direction))
            (ly:text-interface::print grob) -2.3 0))
             \override Voice.Stem #'text = \markup {
            \hspace #-1.025 \fontsize #-4 \musicglyph #"noteheads.s2cross"
       }
}


nokross = {
\revert Voice.Stem #'stencil
\revert Voice.Stem #'text
}


\score{
       \new Staff { \relative c'' {
       a b a c
       \sp
       g f r g
       %\sp
       b r d e
       \nokross
       c a g f
       } }
}
%%%End example

Greetings
Till