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Re: Issue 600 in lilypond: Regression: 'packed-spacing definition may pu


From: Joe Neeman
Subject: Re: Issue 600 in lilypond: Regression: 'packed-spacing definition may put notes outside the staff
Date: Thu, 11 Dec 2008 14:30:08 -0800

On Sat, 2008-11-15 at 12:21 -0800, Joe Neeman wrote:
> On Fri, 2008-11-14 at 21:08 +0000, Neil Puttock wrote:
> > 2008/11/14 Joe Neeman <address@hidden>:
> > > On Fri, 2008-11-14 at 09:56 -0800, address@hidden wrote:
> > >> Issue 600: Regression: 'packed-spacing definition may put notes outside 
> > >> the
> > >> staff
> > >> http://code.google.com/p/lilypond/issues/detail?id=600
> > >>
> > >> Comment #4 by n.puttock:
> > >> Hi Joe,
> > >>
> > >> You might have missed the discussion here:
> > >> http://lists.gnu.org/archive/html/lilypond-user/2008-07/msg00671.html
> > >>
> > >> Is there a way to keep this fix, while also having tight spacing for
> > >> ligatures in
> > >> gregorian chant?
> > >
> > > Thanks, indeed I had missed that conversation. This turned out to be
> > > nothing ancient-specific, it was just a corner case with
> > > ragged-bottom=##t and ragged-bottom-last=##f. It's fixed in git.
> > 
> > Cheers for fixing that.  How does it relate to Issue 347?
> 
> It's probably a step back, but at least we're internally consistent now.
> Actually, I have some objections to issue 347, but I'll put those in the
> appropriate place.
> 
> > 
> > Unfortunately, I linked to the wrong part of that thread; it's around
> > here, http://lists.gnu.org/archive/html/lilypond-user/2008-08/msg00444.html,
> > where it's pointed out that the ancient headword occupies more systems
> > after your fix for #600: the spacing is too loose for the ligatures.
> 
> Ah, sorry, I was looking at completely the wrong issue. Without doing
> any investigation, I think the problem is caused by the way the ligature
> engravers work: they allow the normal Note_head_engraver to do it's job,
> then they destroy all of the noteheads and cram new ones into a single
> Paper_column. This means that there are a bunch of empty Paper_columns
> floating around that were created to hold notes that are now scrunched
> up into a ligature. The extra Paper_columns confuse the spacing engine;
> I've encountered them before.
> 
> The real solution is to set the note head engraver to ignore notes in a
> ligature and to rewrite the ligature engravers so that they look at note
> events instead of piggy-backing off the note head engraver. But I'll see
> if there's a special-case spacing hack that will do for now.

Fixed in git.






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