Re: Doc music examples should be on 1 line

[Trevor Daniels]

Trevor Daniels wrote Tuesday, February 16, 2010 9:59 AM
> Graham Percival wrote Tuesday, February 16, 2010 4:12 AM
>
> > On Tue, Feb 16, 2010 at 12:34 AM, Trevor Daniels 
> > <address@hidden> wrote:
> >
> > > While answering a user question I noticed that
> > > some examples in the LM which were earlier on
> > > a single line now spread undesirably over two
> > > lines in both html and pdf versions. You can
> > > see several examples in 4.5.3.
> > > I'm happy to fix these, but I'm not sure what
> > > I should change. Can you suggest anything?
> >
> > IIRC, the default lilypond-book options were changed some time 
> > around
> > 2.13.6 or so.  It caused all the regtests to be marked as 
> > "changed",
> > which prompted a round of work on lilypond-book and the regtest
> > checking script, or something.  Oh wait, it was the hashing: we 
> > ended
> > up keeping the regtests with their original filenames.
> > I think this happened in Nov or Dec... it was definitely between 
> > Sep and Jan.
>
> > A quick glance at the exact .ly files of the first item in 4.5.3 
> > in
> > 2.13.13 and 2.12.3 supports this:
> > 2.13.13:
> > \paper {
> >   indent = 0\mm
> >   line-width = 5.5\in
> >   line-width = 5.5\in - 2.0 * 0.4\in
> >   ragged-right = ##t
> >   force-assignment = #""
> >   line-width = #(- line-width (* mm  3.000000))
> > }
>
> OK, I started some research.
>
> I fixed exactly this problem for LM 4.5.3 on
> 13/9/2009 by adding line-width = 5.5\in to the
> @lilypond[] commands which invokes these examples.
> That was effective at the time, but the lilypond
> book settings of line-width are now overridden by
> the insertion of line-width = 5.5\in - 2.0 * 0.4\in.
>
> That line was not being inserted last Sept -
> it renders all explicit settings of line-width
> in the @lilypond[] command ineffective.
>
> The change happened sometime after 2.13.4-1.  I'll
> try to narrow down when it happened more closely.

The change seems to have started after commit
c258b7788db8a717b4741f02d9f5cc52862338d4
which was applied by John on Christmas Eve.
As part of his tidying up, the option list is
sorted in line 1236, which places the line-width
lines in a different order, and causes the default
to be applied after the override, rendering the
override ineffective.  I'll push a fix to comment
out the sort for now, until John can check this
out more carefully.

Trevor