Issue 690 in lilypond: Beams and stems disappear when using RemoveEmpltyStaffContext in a PianoStaff

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Issue 690: Beams and stems disappear when using RemoveEmpltyStaffContext in  
a PianoStaff
http://code.google.com/p/lilypond/issues/detail?id=690

New issue report by v.villenave:
% Beams are irregularly printed at the end of the bars (see picture);
% then beams and stems completely disappear above the center line.

\version "2.11.60-1"

\layout {
 ragged-right = ##t
 \context {
   \RemoveEmptyStaffContext
 }
}

measure = \repeat unfold 4 { f16 g a b }

\new PianoStaff <<
\new Staff = "A" { s1 \break s s \break s \break s }
\new Staff = "B" \relative {
 s1 |
 \measure |
 \change Staff = "A" \measure |
 \change Staff = "B" \measure |
 \change Staff = "A" \measure |
}
> >

Attachments:
        RemoveEmptyStaffContext.png  31.5 KB


Issue attributes:
        Status: Accepted
        Owner: v.villenave
        Labels: Type-Defect Priority-Medium

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