Re: vertical spacing of footnotes

[Jean Abou Samra]

Le mardi 14 février 2023 à 15:02 +0100, Valentin Petzel a écrit :

But \column does have exactly that issue. Column will hickup on "lines"
spanning multiple lines.

Precisely. That's why it should receive the lines individually rather than already combined in a stencil.

\version "2.24.0"

\markup \column {
  "Meter change."
  "Chord stem."
  "Bar line."
  \justify { Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut eget 
ante venenatis mi consectetur ornare. Cras facilisis dictum venenatis. }
  "Key change."
}

vs.

\version "2.24.0"

\markup \column {
  "Meter change."
  "Chord stem."
  "Bar line."
  \justified-lines { Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut eget 
ante venenatis mi consectetur ornare. Cras facilisis dictum venenatis. }
  "Key change."
}

Another alternative though:

A stencil could have optional spacing extents. E.g. when you do a text stencil
it will have it’s regular stencil extents, but also also a spacing extent from
base line to top line (which might be smaller or larger than the stencil
extent). A stencil that does not have such extents can safely fall back to the
stencil extents.

All basic stencil operations could then be applied to this just as they apply
to extents. But this would then allow us to stack stencil by this spacing
extent rather than by the drawn extent.

Exactly what I said with

The real fix would be changing the Stencil class to include an additional data member that would be the extent from the baseline of the first line of text to the baseline of the last line of text. Expect a lot of work though: all stencil operations would have to be modified to account for it.

"All stencil operations" may be an exaggeration: most of them wouldn't need to care, but things like translating and combining would.

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