Re: Add text to score without affecting spacing

[Jean Abou Samra]

Le 17/02/2022 à 22:58, Kieren MacMillan a écrit :
> Hi Jean,
>
> > By the way: pedantically, I would recommend
> Thanks for that.
>
> > Basically, \null leads to point-stencil, which has
> > the extent '(0 . 0) on both axes -- a single-point
> > interval. That's small, but not totally empty.
> > empty-interval is '(+inf.0 . -inf.0) which is truly
> > empty, and this is the extent of empty-stencil on
> > both axes.
> I've found interesting failures when using empty-stencil, e.g., this snippet 
> based on a David K suggestion:
>
> %%%  SNIPPET BEGINS
> \version "2.23.4"
>
> ignoreH =
>     \propertyTweak horizontal-skylines ##f
>     \propertyTweak extra-spacing-width #empty-interval
>     \etc
>
> ignoreV =
>     \propertyTweak vertical-skylines ##f
>     \propertyTweak extra-spacing-height #empty-interval
>     \etc
>
> ignore = \ignoreH \ignoreV \etc
>
> {
>    c'4-\ignore _\f
> %  c'4-\ignore ^\markup "test"  %%  uncomment to see failure
> }
> %%%  SNIPPET ENDS
>
> Sometime it's very hard to know what to use in Lilypond… <sigh>



Uh-oh.

https://gitlab.com/lilypond/lilypond/-/merge_requests/1216

Here the failure is caused by the skylines set to
##f. The error only occurs when the script is positioned
up (“^”), so you can work around it until the fix appears
in a release by changing the position indicator to “_”
(it will still give warnings though). Depending on your
taste and how hardly you want the overrides to remove
the object's presence in spacing, you could even set
X-extent/Y-extent to #empty-interval rather than
extra-spacing-width/extra-spacing-height (the 2.23.6
documentation has a new section on horizontal spacing
with an example that illustrates the difference, see
http://lilypond.org/doc/v2.23/Documentation/notation/spacing-between-adjacent-columns).
That also gives warnings, also taken care of by the
linked merge request.

Cheers,
Jean