Re: Issue 2402 in lilypond: Extra bar-lines appear when cadenzas are mixed with time signatures

[lilypond]

Updates:
        Labels: -Type-Ugly Type-Enhancement Needs-evidence

Comment #7 on issue 2402 by address@hidden: Extra bar-lines appear  
when cadenzas are mixed with time signatures
http://code.google.com/p/lilypond/issues/detail?id=2402

The key piece of the example seems to be, with notes instead of rests,
  << {
    { c''1 d'' \bar "" } {\cadenzaOn e''1 f'' \cadenzaOff }
  } \\ {
    { \cadenzaOn c'1 d' \cadenzaOff \bar"||" } { e'1 f' }
  } >>
where the e1 f1 were intended to be in cadenza timing with no bar line.

The program generating this type of LilyPond input seems to expect that  
either the invisible bar, or the extra {}, or the pairing of On and Off   
will cause the cadenzaOn to come after the cadenzaOff.  LilyPond's << >>  
simultaneous music construct, however, makes them happen at the same time.   
Out of the conflicting simultaneous settings LilyPond obeys the one she  
sees (cadenza off and a double bar).

Humans would not write an "off" and "on" to happen at the same time and  
affect the same behavior.  It seems wisest for the program that generated  
this input to change so that it works with LilyPond.