Re: Issue 1015 in lilypond: doc line width

[lilypond]

Comment #9 on issue 1015 by percival.music.ca: doc line width
http://code.google.com/p/lilypond/issues/detail?id=1015

Oops, my fault.  I picked a random .ly compiled bit to look at, but I  
evidently ended up with one without quote.  I didn't do enough  
investigation.

python/book_snippets.py   defines exampleindent (also used for [quote]) as  
0.4\in.  My guess is that they thought that it would look better if *both*  
sides of the image were indented, so that a "full-width" image would still  
be centered on the page.  (I quite agree with that decision)

If I'm correct about this, I'd propose changing the 0.4in into 10mm (just  
for consistency in units).  This gives us 137mm for music, pending some  
uncertainty about the "3mm for bar numbers" question.
(I'd rather have the page width specified as 160mm-2*(quote_length) =  
140mm, then let lilypond figure out how much space it should use for the  
staff, and how much space it should use for bar numbers and instrument  
names... but this would require some programming work)