If any of the interfaces for MultiMeasureRests (e.g. rest-interface, spanner-interface, multi-measure-rest-interface) are included in keepAliveInterfaces (useful if you want to condense some systems in a score, but not others), then when an MMR occurs on either side of a system break it can cause staves to be kept alive that otherwise should be removed due to keepAliveInterfaces = #'().
\version "2.19.82" \layout { \context { \Score keepAliveInterfaces = #'(stem-interface note-head-interface rest-interface ) } } % Ex 1 \new Staff \with { \override VerticalAxisGroup.remove-empty = ##t \override VerticalAxisGroup.remove-first = ##t } { R1 \set Staff.keepAliveInterfaces = #'() \break c'1 } % Ex 2 \new Staff \with { \override VerticalAxisGroup.remove-empty = ##t \override VerticalAxisGroup.remove-first = ##t } { \set Staff.keepAliveInterfaces = #'() c'1 \unset Staff.keepAliveInterfaces \break R1 } Is this a bug? Am I missing something about the intended behavior of MMRs? Ideas for workarounds or fixes? Thanks! Saul
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