Re: Unconventional score and unwanted stray staff lines

[Urs Liska]

Am 21. Mai 2019 10:49:01 MESZ schrieb Thomas Morley <address@hidden>:
>Am Di., 21. Mai 2019 um 02:32 Uhr schrieb Thomas Morley
><address@hidden>:
>>
>> 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
>
>At least in the minimal one can workaround with inserting \noBeam:
>
>\score {
>  <<
>    \new Staff { c'1 c'1 }
>    \new Staff { c'1 c'4 c'16 \noBeam }
>    \new Staff { c'1 c'8 \noBeam }
>    \new Staff { c'1 c'4 }
>    \new Staff { c'1 c'4. }
>  >>
>}
>

Which might even be a pointer to the underlying trigger.

Urs

>Cheers,
>  Harm