Strange bar check error

[Thomas Morley]

Hi,

this came up in the german forum.

Below returns a bar check error as soon as \midi is uncommented.

\version "2.27.2"

\score {
  \relative c' {
    \partial 4
    \repeat volta 2 {
      e4 | e1 |
    } \alternative { { d2. } { d1 | } } }
  \layout { }
  %\midi {}
}

Same problem if \midi is added to our regtest
/input/regression/bar-check-parallel-alternative-ok.ly

Probably, it could be fixed by deleting `measureLength` from the list
for `alternativeRestores`:

  \midi {
    \context {
      \Score
      alternativeRestores = #'(measurePosition measureStartNow lastChord)
    }
  }

Should this be the default for \midi ?

Cheers,
  Harm