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

[Keith OHara]

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.

> 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.