how to give more horizontal space to the voice follower

[Werner LEMBERG]

Dear LilyPond community,


please consider this MWE:

  <<
    \new Staff = "R" {
      \showStaffSwitch
      s2. c'''4 | \change Staff = "L" a4
      \override VoiceFollower.minimum-length = #20
      s2 a4 | \change Staff = "R" c'''4
    }
    \new Staff = "L" {
      s1 | s1 | s4
    }
  >>

Why doesn't the `VoiceFollower` grob obey the `minimum-length`
property (inspite of supporting the `spanner-interface`)?  What am I
missing?


    Werner