From: Aaron Hill <lilyp...@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.

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