#5339 NR: Add @knownissue regarding using \score in a \markup

Came out of

http://lists.gnu.org/archive/html/bug-lilypond/2018-06/msg00037.html

paper spacing variables not being respected for a score inside markup

" ... as soon as I do it, the \paper
variables that are controlling the vertical spacing seem to be
ignored. How can I get two columns and proper spacing at the same
time?"

From T Morley:

"As soon as you put a score in a markup, you are in markup-mode.
Vertical spacing of multi-line-markups is controlled by 'baseline-skip
and in general not by paper-settings."

From D Katrup:

Do we need anything in the NR that might help another user in the future?

In principle, yes. In practice I consider this a disgrace and the
spacing variables should be converted into TeX/LaTeX/TeXinfo equivalents
when using lilypond-book and something equivalent in \markup-score .
This is one case where explaining the perfectly logical consequences of
perfectly understandable technical details of the implementation are a
mess we don't need.

However, we have no equivalents of the page-break dependent spacing of
TeX, let alone things like stretchability and shrinkability in LilyPond:
this is all hardwired in the page breaker and not accessible as markup
at the user level.

So definitely something that is not going to change anytime very soon.
might as well document it.

[Anonymous]

Doc: NR - text.itely add @KnownIssue when using \score in \markup

Issue 5339

Paper spacing variables
are not being respected for
a score inside markup.

Also see:
http://lists.gnu.org/archive/html/bug-lilypond/2018-06/msg00037.html

http://codereview.appspot.com/369830043

[Anonymous]

Passes make, make check and a full make doc.

[Anonymous]

Patch on countdown for 1st September

[Anonymous]

Patch counted down - please push.

[Anonymous]

Doc: NR - text.itely add @KnownIssue when using \score in \markup staging
author  James Lowe <pkx166h@runbox.com> 
    Sun, 26 Aug 2018 13:49:35 +0100 (13:49 +0100)
committer   James Lowe <pkx166h@runbox.com> 
    Sun, 2 Sep 2018 14:00:00 +0100 (14:00 +0100)
commit  24031e4928d88f0f2c2f05dd7e494712aa129043