#### Forbid_line_break_engraver

Forbid line breaks when note heads are still playing at some point.

Properties (read)

`busyGrobs` (list)
  a queue of (end-moment . GROB) conses. This is for internal (C++) use only. This property contains the grobs which are still busy (e.g. note heads, spanners, etc.)

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

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