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Re: Fixes NoteColumn vs SpanBar collisions. (issue 5323062)

From: address@hidden
Subject: Re: Fixes NoteColumn vs SpanBar collisions. (issue 5323062)
Date: Wed, 23 Nov 2011 09:24:44 +0100

On Nov 23, 2011, at 9:21 AM, Keith OHara wrote:

> On Mon, 21 Nov 2011 00:16:12 -0800, Keith OHara <address@hidden> wrote:
>> On Sun, 20 Nov 2011 23:57:22 -0800, <address@hidden> wrote:
>>> I think that you're right for most cases, but for a piece with lots of
>>> accidentals that could potentially hang over barlines, this complexity
>>> in estimation seems to help.
>> Have an example where pure-from-neighbor would do better than
>> axis-group-interface:height ?
> Well I can't seem to get axis-group-interface:height to work for BarLines at 
> all.
> I must not understand how SpanBars used to work.

axis-group-interface::height takes the height of the grobs in the 'elements 
grob-array for a given grob.  Span bars have bar lines in their 'elements grob 
array, which is why span bars worked.  Bar lines don't have an 'elements grob 
array (they just have a 'neighbors grob array with the current patch).

>> I expect that occasionally, this patch will let a collision with a span
>> bar leak through, but it would be something crazy like an \espressivo atop
>> a \downbow on a note connected to a cross-staff slur.  The \espressivo
>> isn't pure-relevant because of the cross-staff poisoning.
> This doesn't look too bad.  At most it slightly increases the incidence of 
> cross-staff collisions
>  \new GrandStaff <<
>    \new Staff = "up" {
>      g'1 \noBreak g'1 \noBreak g'1 }
>    \new Staff = "down" {
>      g'1 g'1 e''2_\(\portato\espressivo
>      \change Staff="up" f'2\) } >>
> The espressivo is generally disrespected in spacing.  If we turn the g's in 
> the upper staff into gs, the last of them hits the espressivo.

Thanks for the example!  I'll address it after pushing this series of patches.  
If I forget, please remind me.


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