lilypond-book music runs off right side of the page

[Graham Percival]

The below example demonstrates that lilypond-book cannot estimate
the line width correctly; music runs off the right-hand side of
the page.  Please add as Type-script, Priority-high, and with a
label:maintainability.

Also note that this bug has NOTHING to do with the documentation.
It's a perfectly reasonable file.  Compile with:

lilypond-book --pdf linelength.tely
texi2pdf linelength.texi

Cheers,
- Graham


\input texinfo @c -*- coding: utf-8; mode: texinfo; -*-
@setfilename LineTest
@settitle PhilTest
@afourpaper

Test Lorem ipsum dolor sit amet, consectetur adipisicing elit.

@lilypond[relative=2]
\repeat unfold 100 { c4 }
@end lilypond

Test Lorem ipsum dolor sit amet, consectetur adipisicing elit.

@lilypond[relative=2]
\set Staff.instrumentName = "Violincello"
\repeat unfold 100 { c4 }
@end lilypond

Test Lorem ipsum dolor sit amet, consectetur adipisicing elit.

@bye