Book title no longer hown in preview

[Sven Axelsson]

When creating a preview image with Lilypond 2.8.0 from a score
containing a \book statement, the book title is no longer shown, only
the piece title(s). Don't know when the change was introduced, but at
least in 2.7.14 or so it worked as expected (including the book title
that is).

Try this

% file: test.ly
\book {

\header { title = "Book Title"}

\score { { a' b' a' b' } \header { piece = "Piece 1" } }

\score { { a' b' a' b' } \header { piece = "Piece 2" } }

}

and run with lilypond --preview test.ly

--
Sven Axelsson