Polyphony Note head Merging

[john-nedallascg]

The following code generates 7 measures with two voices.  What I *want* is
for the lower voice half-notes to merge with the upper voice 1/8 notes.  It
does the merge as expected for the meaure with two 1/4 notes (meas 2).  Can
lilypond merge the half-notes in the same fashion?  I hacked this out via
looking at examples and the meaning of the "##t" is unknown to me.

\version "2.7.32"
     
\header { 
  title = "Multi-Voice for Guitar"
  }

#(set-global-staff-size 18)
#(set-default-paper-size "a4")
forcedBreak = \break

\paper{
 % hsize = 2\cm
  top-margin = 1\cm
  left-margin = 0.75\in
  line-width = 7.25\in
  bottom-margin = 0.75\in
  between-system-space = 1\in
  raggedlastbottom = ##t
}

  upperVoice = { 
     \stemUp
     \set fingeringOrientations = #'(left)
     \set Staff.instrument = "Guitar 1"
     \set Staff.minimumVerticalExtent = #'(0 . -10)
     e,8 b8 g8 e'8 e8 b8 g8 e'8 |                               %1 Guitar 1
     e,8 b8 g8 e'8 e8 b8 a8 c'8 |                               %2
     e,8 b8 g8 e'8 e8 b8 a8 c'8 |                               %3
     \break  
     e,8 b8 g8 e'8 e8 b8 g8 e'8 |                               %4
     fis,8 a8 d8 c'8 g,8 g8 d8 b8 |                             %5
     b,8 g8 c8 g8 cis8 g8 d8 g8 |                               %6
     dis8 c'8 a8 fis'8 a,8 c'8 a8 fis'8 \bar "|."               %7
     \break  
  }
   
  middleVoice = { 
     \stemDown
      s1 |                                                      %Intro Middle 
Voice
      s1 |                                                      %2
      s1 |                                                      %3
      s1 |                                                      %4
      s1 |                                                      %5
      s1 |                                                      %6
      s1 |                                                      %7
  }

  lowerVoice = { 
     \set fingeringOrientations = #'(left)
     \stemDown
      e,2 e2 |                                                  %Intro Lower 
Voice
      e,4 e,4 e2 |                                                      %2
      e,2 e2 |                                                  %3
      e,2 e2 |                                                  %4
      fis,2 g,2 |                                               %5
      b,4 c4 cis4 d4 |                                          %6
      dis2 a,2 |                                                %7
  }


\score {
    \context Staff  << 
      \time 4/4
      \override NoteCollision #'merge-differently-dotted = ##t
      \override NoteCollision #'merge-differently-headed = ##t
      \key e \minor
      \clef "G_8"
      \context Voice = one \override TupletBracket #'number-visibility = ##f
\upperVoice
      \context Voice = two \middleVoice
      \context Voice = three \lowerVoice
    >>
  \layout { 
    }
  \midi { \tempo 4=60
    }
}


Thanks, in advance!

John
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