Re: strut problem

[Jean Abou Samra]

Le 18/11/2022 à 05:46, Werner LEMBERG a écrit :
> You are correct with your LaTeX observation.  However, the longer I
> think about struts – even `\vspace` is nothing else than a vertical
> strut! – the more I believe that there is a conceptual problem in
> LilyPond: There is a 'typesetting mode' where vertical struts have an
> effect (like the problem originally reported in 'lilypond-user',
> starting with
> https://lists.gnu.org/archive/html/lilypond-user/2022-11/msg00237.html),
> and there are other modes without such an effect.
>
> What about making LilyPond properly integrate (finite) struts into the
> skyline?


I'm not understanding what you mean by this precisely. Are you talking
about a change to the definition of \strut or a change to how skylines
are computed?

Regarding the latter, the handling looks inconsistent. I've opened
https://gitlab.com/lilypond/lilypond/-/issues/6472 about that.


> I see two advantages.
>
> * It removes the above-described modality, which seems unnecessary to
>    me.  If it is really necessary, it lacks an explanation in the NR.
>
> * It would allow fine-tuning of the skyline in a simpler way than what
>    currently is possible.  Imagine, for example, that you need some
>    empty space above letter 'V' of the string 'VAVA':
>
>    ```
>        |
>        |
>       ++---+
>       |VAVA|
>    ```
>
>    The 'correct' solution would be to put letter 'V' into a
>    `\with-dimension` box or something similar [please correct me if
>    there is something better].  However, doing so might produce a
>    different output if, say, there is kerning: Pango now sees 'V' and
>    'AVA', and the kerning between the first 'V' and 'A' is lost, AFAIU.
>
>    The alternative would be to insert a vertical strut right before
>    letter 'V'.



Note that, say, a vertical strut between "V" and "A" would
also defeat kerning.

Have you already found yourself needing to fine-tune skylines?
I have always gotten along by tweaking padding and padding-like
properties.

By the way, can you check what your mail client is doing with
email subjects? Your email's is

"strut problem,Re: strut problem,Re: strut problem,Re: strut problem"

Jean

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