Notehead of harmonic whole note too narrow

[Nick Payne]

The noteheads of whole notes are considerably wider than the noteheads 
of smaller value notes, but a whole note harmonic has a notehead that is 
exactly the same width as a harmonic notehead of any lesser value, and 
considerably narrower than the head of a normal whole note. This makes a 
whole note chord look rather ugly when one of the notes in the chord is 
a harmonic. For example, here is the final bar of Villa-Lobos' Etude No 1:

\version "2.17.25"

\relative f'' {
  \key e \minor
  <<
    { \override NoteHead.style = #'harmonic-mixed b1 }
    \\
    {
      \set tieWaitForNote = ##t \stemUp
      \grace { e,,,16~[ gis'~ cis~ e~] } <e,, gis' cis e>1
    }
  >>
}

test.png
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