Re: lily/auto-beam-engraver: keep a Context_handle to starting Staff (issue4830064)

[n . puttock]

LGTM.  Just needs a regtest.


http://codereview.appspot.com/4830064/diff/5001/lily/auto-beam-engraver.cc
File lily/auto-beam-engraver.cc (right):

http://codereview.appspot.com/4830064/diff/5001/lily/auto-beam-engraver.cc#newcode85
lily/auto-beam-engraver.cc:85: Handle on the starting staff keeps it
alive until beam is comlete
complete

http://codereview.appspot.com/4830064/diff/5001/lily/context.cc
File lily/context.cc (right):

http://codereview.appspot.com/4830064/diff/5001/lily/context.cc#newcode38
lily/context.cc:38: return context_list_ == SCM_EOL && ! client_count_
!client_count_

http://codereview.appspot.com/4830064/