#4886 Replace Grace_beam_engraver::listen_beam

[David Kastrup]

Replace Grace_beam_engraver::listen_beam

The comment for it complains about copy&paste code, but the
actual code for Beam_engraver::listen_beam has evolved since
then and the changes, while seeming appropriate for the
Grace_beam_engraver as well, have not been copied over.

Deleting the listener callback and instead utilizing
the one from the base class Beam_engraver seems like
the sanest course of action.

http://codereview.appspot.com/295490043

[David Kastrup]

Rebase on current master

http://codereview.appspot.com/295490043

[Anonymous]

Passes make, make check and a full make doc.

[Anonymous]

Patch on countdown for June 12th.

[Anonymous]

Patch counted down - please push.

[David Kastrup]

Pushed to staging as
commit ece0ac805c9705a936915114f82a4532b1b548dc
Author: David Kastrup dak@gnu.org
Date: Sun Jun 5 16:32:11 2016 +0200

Issue 4886: Replace Grace_beam_engraver::listen_beam

The comment for it complains about copy&paste code, but the
actual code for Beam_engraver::listen_beam has evolved since
then and the changes, while seeming appropriate for the
Grace_beam_engraver as well, have not been copied over.

Deleting the listener callback and instead utilizing
the one from the base class Beam_engraver seems like
the sanest course of action.