Enhancement: using \barNumberCheck inside a \repeat with articulate.ly

[Knute Snortum]

If you are using articulate.ly, you can't have a \barNumberCheck inside a
\repeat even if it's a volta. I believe this is because \articulate does a
\repeat unfold so it's not a bug per se, but it's a pretty important
enhancement (IMO) since a lot of baroque music uses trills and repeats.

\version "2.19.19"
\language "english"
\include "articulate.ly"

music = \repeat volta 2 {
  \relative c'' {
    c1 \prall |
    \barNumberCheck #2
    d1 |
  }
}

\score {
  \music
  \layout {}
}

\score {
  \articulate <<
    \music
  >>
  \midi {}
}

Knute Snortum
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