Re: Turn with flat above under slur

[Jean Abou Samra]

Le 05/06/2021 à 15:32, Knute Snortum a écrit :
> On Sat, Jun 5, 2021 at 12:24 AM Jean Abou Samra <jean@abou-samra.fr> wrote:
> > Le 05/06/2021 à 01:44, Knute Snortum a écrit :
> > > Hi all,
> > >
> > > I am trying to engrave a turn with a flat above it, all under a slur.
> > > I can't seem to get it no matter what I try.  Here is a fairly minimal
> > > example:
> > >
> > > %%%
> > > \version "2.22.1"
> > > \language "english"
> > >
> > > \relative c'' {
> > >     \key ef \major
> > >     \time 12/8
> > >     \partial 8 bf8( |
> > >     g'4
> > >     \once \override TextScript.avoid-slur = #'inside
> > >     c,8^\turn^\markup { \flat } c'4 g8 bf4. af4 g8) |
> > > }
> > > %%%
> > >
> > > The turn is inside (below) the slur, but not that flat. It seems like
> > > the slur is leaving enough room for the flat, but the flat won't go
> > > below the slur. Any suggestions?
> > Hello,
> >
> > When the TextScript has an outside-staff-priority,
> > its alignment is fixed by other means than avoid-slur.
> >
> > \version "2.22.0"
> > \language "english"
> >
> > \relative c'' {
> >     \key ef \major
> >     \time 12/8
> >     \partial 8 bf8( |
> >     g'4
> >     \once \override TextScript.avoid-slur = #'inside
> >     \once \override TextScript.outside-staff-priority = ##f
> >     c,8^\turn^\markup { \flat } c'4 g8 bf4. af4 g8) |
> > }
> >
> > Best,
> > Jean
> That's perfect Jean, thanks! I did fool around with
> outside-staff-priority, but always with a number.  I didn't know it
> could take a value of false.
>
> To the list again, in the Internals Reference for TextScript
> (https://lilypond.org/doc/v2.22/Documentation/internals/textscript)
> under outside-staff-priority, it says it takes a number but there's no
> mention of it taking a boolean.  Did I miss something or is this a
> possible improvement to the manual?

This is in fact not specific to outside-staff-priority:
all kinds of properties accept '() and #f in addition to
the values matched by their type predicate. Think
\override SomeGrob.stencil = ##f (what the \omit shortcut does).
This is a way to signal that the property has no particular
value; when the property is not set (such as outside-staff-priority
for a NoteHead), it is taken to be '(). So, in most cases (there
can be subtle exceptions), a property can be unset by setting
it to '(). #f is generally equivalent and often used; there
is a lot of inconsistency in LilyPond between #f and '()
that we should probably think about someday.

So, when you set outside-staff-priority to #f, it becomes
as though the grob does not have any outside-staff-priority
Then, the functions using that property stop affecting the
grob in question.

Best,
Jean