New for specialist notation

• For orthogonality with other ancient clefs, five new mensural clefs are available: "mensural-f2", "mensural-f3", "mensural-f4" (same as "mensural-f"), "mensural-f5", "mensural-g1", "mensural-g2" (same as "mensural-g").
• The default time signature and accidental style in a PetrucciStaff context is now the same as in MensuralStaff.
• White mensural ligatures now support some rare ligatures (semibreves alone or in the middle), and allow tweaks to show some non-necessary stems.

  \score {
    \relative {
      \set Score.timing = ##f
      \set Score.measureBarType = #'()
      \override NoteHead.style = #'petrucci
      \override Staff.TimeSignature.style = #'mensural
      \clef "petrucci-c4"
      \[ a1 g f e \]
      \[ a1 g\longa \]
      \[ \once \override NoteHead.left-down-stem = ##t
         a\breve b
         \once \override NoteHead.right-down-stem = ##t
         g\longa \]
      \[ \once \override NoteHead.right-down-stem = ##t
         b\maxima
         \once \override NoteHead.right-up-stem = ##t
         g\longa \]
    }
    \layout {
      \context {
        \Voice
        \remove Ligature_bracket_engraver
        \consists Mensural_ligature_engraver
      }
    }
  }
  

  

• The use of the gregorian.ly is deprecated. While still working for backward compatibility, it should be replaced with a VaticanaScore context together with some manual \layout changes (if necessary): code like

  \include "gregorian.ly"
  
  \score {
    \new VaticanaStaff { ... }
  }
  

  should become

  \new VaticanaScore {
    \new VaticanaStaff { ... }
  }
  
  \layout {
    indent = 0
    ragged-last = ##t
  }
  

• LilyPond’s ‘arabic’ note name language is deprecated. While still working for backward compatibility (if you load hel-arabic.ly), it is recommended to use ‘english’, ‘italiano’, or your preferred note name language instead.
• Defaults for fret diagram fret labels have changed.
  • The default value for fret-label-vertical-offset is set to -0.5, which centers the label in the fret space.
  • The default number format is now 'custom, with a format string of "~dfr" (resulting in ‘3fr’, for example), instead of 'roman-lower.
• Command \autoBeamOff now stops auto-beaming immediately. Previously, its effect was delayed if a beam generated by the auto-beamer engraver was still active.
• It is no longer necessary to switch off auto-beaming while using \crossStaff.
• The \upbow and \downbow signs are now properly inverted if used below a staff. As a consequence, the glyphs script.upbow and script.downbow have been renamed to script.uupbow and script.udownbow, respectively, and the new inverted glyphs are named script.dupbow and script.ddownbow.

  \relative c' {
    f4^\downbow f^\upbow f_\downbow f_\upbow
  }