[Lilypond-auto] Issue 3566 in lilypond: Grace notes should be autobeamed

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Enhancement grace

New issue 3566 by address@hidden: Grace notes should be autobeamed
http://code.google.com/p/lilypond/issues/detail?id=3566

Cf the thread following  
<URL:https://lists.gnu.org/archive/html/lilypond-user/2013-09/msg00673.html>.

It would seem that deriving a Grace_auto_beam_engraver from  
Auto_beam_engraver in the same manner as the Grace_beam_engraver is derived  
from the Beam_engraver would be the most straightforward way to handle this.

The rule for the Auto_beam_engraver would be trivial: try to beam across  
the whole grace phrase, abandoning the grace autobeam (like any autobeam)  
if a \noBeam or manual beam or beaming-incompatible event intervenes or any  
of the other conditions the Auto_beam_engraver already handles.

The old behavior could easily be reestablished by removing the  
Grace_auto_beam_engraver.  Since any manual beaming would override the  
autobeam, the incompatible cases would be limited to cases where a  
completely unbeamed behavior was expected, arguably rare with classical  
music notation.

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