Re: Issue 1880 in lilypond: Presence of a bar number changes whole-measure rest width significantly

[lilypond]

Comment #1 on issue 1880 by address@hidden: Presence of a bar  
number changes whole-measure rest width significantly
http://code.google.com/p/lilypond/issues/detail?id=1880

Here's a simple work-around (by analogy with textLengthOn/Off):

barNumberLengthOn = {
  \override Score.BarNumber #'extra-spacing-width = #'(0 . 0)
  \override Score.BarNumber #'extra-spacing-height = #'(-inf.0 . +inf.0)
}
barNumberLengthOff = {
  \override Score.BarNumber #'extra-spacing-width = #'(+inf.0 . -inf.0)
  \override Score.BarNumber #'extra-spacing-height = #'(0 . 0)
}

Trevor