Re: Unexpected white space at end of document if score in markup block (single page pdf output #ly:one-page-breaking)

Hi Matthew,

> In the attached *mwe-score-in-markup.pdf*, I've drawn in a red filled 
> box for that unexpected whitespace. I am generating a single page PDF 
> with the music fitting exactly the height of all the systems, via 
> page-breaking = #ly:one-page-breaking. All margins and spacing set to 
> zero as part of my debug process.
>
> If the score is not in a markup block, there is no extra space at 
> the bottom, as *expected-no-space.pdf* shows.
>
> Any ideas what is causing this? Included is an MWE. To see what I 
> believe is the expected behavior, simply comment out all markup blocks 
> after the score. Appreciate the feedback/help in advanced!

I don't have a solution yet, but I just want to point out that your 
example is far from being minimal. You can observe the behaviour you 
describe already in the following:

\version "2.24.4"

\markup { \box \line { \vspace #3 text } }

zero-spacing =
#'((basic-distance . 0) (minimum-distance . 0) (padding . 0) 
(stretchability . 0))

\paper {
     tagline = ##f
     page-breaking = #ly:one-page-breaking

     left-margin = 0
     top-margin = 0
     right-margin = 0
     bottom-margin = 0

%    system-system-spacing = \zero-spacing
%    score-system-spacing = \zero-spacing
%    score-markup-spacing = \zero-spacing
%    markup-system-spacing = \zero-spacing
%    markup-markup-spacing = \zero-spacing
%    top-system-spacing = \zero-spacing
     top-markup-spacing = \zero-spacing
     last-bottom-spacing = \zero-spacing
}

(I left the commented-out spacing variables in because it's clear that 
they will be needed in your future application.)

My current theory is that we're observing an artifact of the design of 
ly:one-page-breaking. But I have to investigate. (It's interesting to 
note what happens if we remove the tagline = ##f setting!)

Lukas