Issue 1788 in lilypond: auto numbering footnote checkin doesn't play with \null and \musicglyph

[lilypond]

Status: Accepted
Owner: address@hidden
Labels: Priority-High Type-Defect

New issue 1788 by address@hidden: auto numbering footnote checkin  
doesn't play with \null and \musicglyph
http://code.google.com/p/lilypond/issues/detail?id=1788

Before commit: 233aad0ba9781e43424c4e77a859e42b660210e6

The following example worked fine:

\version "2.15.6"

 #(set-default-paper-size "a6")

\book {
  \relative c' {
   c1
    \breathe
    \footnoteGrob #'BreathingSign #'(1 . 1)
    \markup { \musicglyph #"rests.4" }
    \markup { \null }
  }
}

Now it prints the numeral '1' all over the place actually. If you change  
\null to " ", then it goes away but I get a number with no footnote. It  
also seems to ignore the glyph used in a markup.

My original intention in my doc patch  
(http://codereview.appspot.com/4751045/) was to show how to have  
a 'footnoteGrob markup without a footnote (and also show how you can add  
space between the copyright and the last footnote), Neil suggested I use  
\null instead of " " which did the same thing, until now.