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

From: Keith OHara
Subject: Re: Fixes NoteColumn vs SpanBar collisions. (issue 5323062)
Date: Wed, 23 Nov 2011 00:21:14 -0800
User-agent: Opera Mail/11.52 (Win32)

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 
I must not understand how SpanBars used to work.

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.

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