Re: Unconventional score and unwanted stray staff lines

[Thomas Morley]

Am So., 19. Mai 2019 um 20:32 Uhr schrieb Urs Liska <address@hidden>:

> The staves that continue to be printed appear to only happen when the
> last note in that staff is an actual printed note. If it's a rest or a
> space then the extra staves are not printed. Further experimentation
> and it looks like the extra staves are only printed if the final note
> is less than a quarter note (!).
[..]
> Maybe something to do with the time signature as well?
>
> This looks like a bug maybe?
>
> I could confirm that behaviour with the following MWE:
>
> \version "2.21.0"
>
> \score {
>   <<
>     \new Staff { c'1 c'1 }
>     \new Staff { c'1 c'4 c'16 }
>     \new Staff { c'1 c'8 }
>     \new Staff { c'1 c'4 }
>     \new Staff { c'1 c'4. }
>   >>
> }
>
> I too find this surprising. I suggest you ask on lilypond-user whether this 
> is a bug or intended behaviour. If it is intended (due to some engraving 
> convention for example) it might be made configurable.

Looks like a bug to me.

First bad commit:

commit 9ff88d127acb371435a96e04cba7f0e3f525496d
Author: Keith OHara <address@hidden>
Date:   Sat Aug 6 12:05:59 2011 -0700

    auto-beam-engraver: keep a Context_handle to starting Staff

Which is in version 2.15.9

cc-ing Keith


Cheers,
  Harm