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Re: Disappearing barlines with skipBars - possible bug?


From: Mark Knoop
Subject: Re: Disappearing barlines with skipBars - possible bug?
Date: Tue, 24 Mar 2015 14:38:15 +0000

At 12:31 on 24 Mar 2015, Kevin Barry wrote:
>On Tue, Mar 24, 2015 at 9:01 AM, Mark Knoop <address@hidden> wrote:
>>>>At 18:16 on 23 Mar 2015, Mark Knoop wrote:
>>>Barlines disappear when skipBars is true and a note duration
>>>continues over the bar. I don't think this should happen.
>>>
>>>\version "2.18.2"
>>>
>>>{
>>>  \time 2/4
>>>  r4 c'2 r4
>>>  r4 \tuplet 3/2 { c'2 d'4 } r4
>>>  \set Score.skipBars = ##t
>>>  r4 c'2 r4
>>>  r4 \tuplet 3/2 { c'2 d'4 } r4
>>>}
>>>
>> Tuplets across barlines are a relatively common notational practice
>> and work perfectly well in LilyPond. It is undesirable that they
>> should require a workaround for use in parts with skipBars.
>
>If I understand you correctly it seems that skipBars simply shouldn't
>apply to notes then? To clarify what I meant: I can't think of any
>score where notes that cross barlines would leave any bars empty,

{ \time 2/4 c'4 c'1 c'4 } % 3 bars, 2nd of which is empty

{ \time 2/4 c'4 c'2 c'4 } % 2 bars, neither of which is empty

>which begs the question of what exactly skipBars is supposed to do
>with notes that cross barlines? My understanding was that it merges
>the bars in question.

skipBars is introduced in the Learning Manual (3.4.5 Scores and parts)
as a way of condensing multi-measure rests. Its only references in the
Manuals are regarding this function. I suspect its impact on notes
crossing barlines is either unintended or at least not thought through.

I can't imagine a situation where the current behaviour would be
desirable (silently hiding a barline thus changing the length of a bar)
and it would certainly seem to be a very different use case than
condensing multi-measure rests. If there is a case for keeping the
behaviour, I would suggest a separate property for notes that cross
barlines.

>>I would be interested in others' opinions on this.
>
>I still think you should send this to the bug list, where it is more
>likely to get discussed (some of the developers there are not
>subscribed to the user list).


--
Mark Knoop



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