#### Note_head_line_engraver

Engrave a line between two note heads, for example a glissando. If followVoice is set, staff switches also generate a line.

Music types accepted:

glissando-event

Properties (read)

`followVoice` (boolean)
  if set, note heads are tracked across staff switches by a thin line

This engraver creates the following layout objects: Glissando and VoiceFollower.

`Note_head_line_engraver` is part of contexts: GregorianTranscriptionVoice, TabVoice, VaticanaVoice and Voice

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