RFC: text around systems

[Nicolas Sceaux]

Hi,

On the -user-fr list, Valentin has expressed a need regarding a new
way of inserting text in a piece (he needs this for the opera of his
that he's typesetting).

/==========================
|==========================
\==========================
Some very large, multi line
scenic annotation between
two systems of a piece
/==========================
|==========================
\==========================

Using TextScripts or RehearsalMarks is not satifying, for it's not
possible to automatically align against the left margin. I may be
missing another option.

A very loose idea about how to do it: some kind of RearsalMark, not
attached to a system column but to the system upper-left corner (or
maybe otherwise according to some property).  A new
system_text_engraver is defined, which detects some
"\set Score.systemText" property set, and attaches a new SystemText
grob to (say) the upper-left corner of the current system.

+text goes here
/==========================
|==========================
\==========================

It might be possible to do this:

/==========================
|========================== +Da Capo
\==========================

Would there be objections against the implementation of such a feature?
Does it seem a reasonnable approach? (I'm not sure it makes sense at
all).

nicolas