merge-differently-headed does not always work.

[Peter Terpstra]

Dear readers.
The quarter note a from measure 19 and 20 lowervoice does not get merged
 with the 8th from midlevoice. Anybody knows why?


~~Start .ly snippet
timeAndKey = { \time 3/4 \tempo 4 = 112 \key g \major \clef "G_8" }
Sup = { \once \override Stem #'neutral-direction = #up }

staffClassicalGuitar = \new Staff  {
        \override Score.MetronomeMark #'padding = #7
        \set Staff.midiInstrument="acoustic guitar (nylon)"
        \override Staff.NoteCollision #'merge-differently-headed = ##t
        \set Staff.connectArpeggios = ##t
        \transposition c'
        \timeAndKey
        \relative c' 
% Treble
<<      
        { r8 b cis! dis! e fis |
        \repeat volta 2 { 
                a4.*2/3  b,8  g'^( fis)[ g ]  | %  3
                fis8( e) dis! e b e | % 4
                d4.*2/3 e,8 c'( b ) a | \break % 5 
                gis!( a) c b ais( b ) | % 6
                e( dis) d! dis g( fis) | % 7
                f! fis! c'4 b,,8 b''  | % 8
                a4.*2/3  b,8 g'^(fis) e |\break % 9
                dis! c b a g fis | % 10
                a'4.*2/3  b,8  g'^( fis)[ g ]  | % 11
                fis8( e) dis! e b e  | % 12
                d4.*2/3 e,8 c'( b) a |\break % 13
                gis( a) c( b) d( c) | %14
                b ais b cis dis e | % 15
                fis g a b cis dis | % 16
                e ais,( b) c!( b) g | % 17
                                }\alternative {  { e b cis dis e fis|} { e
<e'\harmonic> <b\harmonic>
<g\harmonic> e b | }} % New repeat, measure  nr 19
                                \repeat volta 2 { d4. e | % 20
                                        d e | % 21 
                                }
        }
% Alt
\\      
{ s2. | \repeat volta 2 { 
                s4 <b g>2 | % 3
                s4 e,2 | s4 e2 | % 5
                s2. | s4 a2 | % 7
                s2. | s4 b2 | % 9
                s2. |  s4 <b g>2 | % 11
                 s4 e,2 | s4 e2 | % 13
                 s2. | s | % 15
        s2.  | s2. | } \alternative
                 { {<b' g>4 s2 | } { <b g>4 s2 | } }  % New repeat, measure 
nr 19
                 \repeat volta 2 { 
                         s4 <c d,^\laissezVibrer>4.*2/3 a,8\laissezVibrer
c'8 ~ | % 20
                         c c <c d,^\laissezVibrer>4.*2/3 a,8\laissezVibrer
c'8 | % 21
                         
                         }
        }
        
% Bass
\\      
        { \stemDown 
                s2. |\repeat volta 2 { e,, | % 3
          gis!2. | a | % 5
          a | b | % 7
          b4 s b | e2. | % 9
          b4 s2 | e,2. | % 11
           gis!2. | a2. | % 13
           a | b2 s4 | % 15
           <b a' dis>2 b4 | % 16
                                \tieDown e,2. ~ | }\alternative { {e | }
{e\repeatTie | } }
                                \repeat volta 2 { fis2 \Sup a4  | % 20
                                        fis2 \Sup a4 |
                                }
        }
>>
}
~~ End .ly snippet.

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Kind Regards,

   Peter



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