Minor barcheck and \partial interaction bug

[Trevor Baca]

Hello,

I didn't think I'd ever need a partial measure in the middle of an
ongoing line of music, but, as it happens, the 7th Bach chorale melody
changes from 4/4 to 3/4 after measure 4 and begins the 3/4 section
with a 1 beat \partial in the middle of the line.

LilyPond handles this fine, with the exception that the barcheck
following the midline \partial works in the first staff (in lex order)
in the input file and then fails on following staves.

Here's the example with the pitches changed ...

\score {
   \new PianoStaff <<
      \new Staff {
         \clef treble
         \time 4/4
         d'4 d'4 d'4 d'4 \bar ":|" | % this barcheck works fine
         \time 3/4
         \partial 4 e'4 |
         f'4 f'4 f'4 \bar "|." |
      }
      \new Staff {
         \clef bass
         \time 4/4
         d4 d4 d4 d4 \bar ":|" | % this barcheck fails
         \time 3/4
         \partial 4 e4 | % the barchecks start working here again
         f4 f4 f4 \bar "|."
      }
   >>
   \layout {raggedright = ##t}
}

All this under 2.7.0, btw.

The workaround is simply to omit that one particular barcheck in the bass.

Trevor.