Incomplete measure numbering in repeat

[Menu Jacques]

Hello folks,

In this example (from Gabrieli, faked time signature), is the second alternative's first measure to be numbered 3, or 2?

Thanks for your help!

JM

\version "2.19.44"

\relative g' {
  \set Score.barNumberVisibility = #all-bar-numbers-visible
  \override Score.BarNumber.break-visibility = #all-visible

  \time 4/2
  \set Staff.timeSignatureFraction = 2/2

  \repeat volta 2 {
    g2 r8  g8 [  bes8  c8 ]
    d2 c2 |
  }

  \alternative {
    {
      \partial 1
      d'4  d4.  bes8 a4 |
    }
    {
      d4  d4.  bes8  a4
      g8 d'8 [  b8  c8 ]  d2 |
    }
  }

  \bar "|. »
}