Re: partCombine misinterprets Solo

[David Santamauro]

I believe this is all related to the dynamics (more to the point, the 
termination: \!. If we forget the misplacement of “Solo” for a moment and 
observe the behavior of \partCombine with just the dynamics, it seems to have 
real difficulties with dynamics termination.

\version "2.22.2"

\include "english.ly"

vOne = \relative {
  c''4 c4 c4 c4
  c1\>
  R1\!
  R1*2
  r2 r4 c4\<
  c1\!
}
vTwo = \relative {
  R1
  R1
  R1
  R1*3
  e'1
}

\score {
  <<
    \new Staff \vOne
    \new Staff \vTwo
    \new Staff \partCombine #'(0 . 0) \vOne \vTwo
  >>
  \layout { }
}

… vOne \> termination in m. 3 is ignored and instead, \partCombine moves on to 
the \< in m. 5 and finally terminates in m.6


> On Mar 23, 2022, at 5:46 AM, David Santamauro <david.santamauro@gmail.com> 
> wrote:
> 
> From: Aaron Hill <lilypond@hillvisions.com>
> 
> 
> On 2022-03-23 1:52 am, David Santamauro wrote:
> > > mm 1- 3 and 3-6 are note-identical. The only difference is the
> > > decrescendo in m. 1, terminated in m. 2. I believe the terminating
> > > decrescendo in vTwo/m. 2 causes the partCombine code to think there's
> > > music in vTwo/m. 2 -- I could be wrong, but the result is wrong
> > > nevertheless.
> 
> > Consider adding...
> > 
> >   \once \partCombineSoloI
> > ...at the beginning of the second measure.
> 
> Thanks …
>  
> %%%%%%
> \version "2.22.2"
>  
> \include "english.ly"
>  
> vOne = \relative {
>   c''1\>
>   \once \partCombineSoloI c1\! 
>   c1 \bar "||"
>   c1 c1  c1
> }
> vTwo = \relative {
>   e'1\> R1\!  R1
>   e1 R1  R1
> }
>  
> \score {
>   <<
>     \new Staff \vOne
>     \new Staff \vTwo
>     \new Staff \partCombine #'(0 . 0) \vOne \vTwo
>   >>
>   \layout { }
> }
> %%%%%%%
>  
> … yields:
> ./snippet.ly:6:7: warning: unterminated decrescendo
>   c''1
>       \>
> ./snippet.ly:12:6: warning: unterminated decrescendo
>   e'1
>      \> R1\!  R1
>  
> But it did force "Solo" albeit without the specified hairpin.