Re: Bar count wrong after multirest

[Simon Albrecht]

Hello Silas,

On 31.10.2015 23:06, Silas S. Brown wrote:
> Hi, I wonder if someone could put in a feature request for better
> diagnostics of the following mistake.  I gave this to Lilypond version 2.18.2:
>
> \score { << \new Staff << \context Voice = TheMusic {
> \compressFullBarRests
> \override Score.BarNumber.break-visibility = #end-of-line-invisible
> \set Score.barNumberVisibility = #(every-nth-bar-number-visible 1)
> \time 4/4 R1*3 | c'' | d''
> } >> >> \layout{} }
>
> and got a PDF where the 3-bar rest is followed by bar 4 (correct), but the
> next bar is 7 instead of 5.
>
> The cause of this appears to be that, at least as far as bar numbering is
> concerned, the length of "1*3" from the "R1*3" persists for the c''.

Which is the whole reason: as always, if you don’t give a new duration 
for a note or rest, it will use the duration from the previous one. So 
you have to enter c''1 explicitly in order to fix the problem.

>    I was
> just thinking it would be a single semibreve (whole note), and indeed it
> LOOKS like a single semibreve, but the bar numbering still counts it as 3 bars.

If you insert
%%%%%%%%%%%%%
\layout {
  \context {
    \Voice
    \remove "Note_heads_engraver"
    \consists "Completion_heads_engraver"
  }
}
%%%%%%%%%%%%
into your input file and compile it, you’ll see that the c'' semibreve 
really fills three bars and the bar numbering is correct here. 1*3 means 
a duration of a semibreve, scaled by three. The MultiMeasureRest engine 
just handles this different than it is handled for notes.

HTH, Simon