problems with RemoveEmptyStaffContext in PianoStaff

[Mark Polesky]

What's going on here? Are these known bugs?
(see attached png for description)

Thanks,
Mark

----------------------------------------------------

\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 |
}
>>

----------------------------------------------------

RemoveEmptyStaffContext.png
Description: PNG image