v2.4 - Right Margin Not Obeyed

[Serban Giuroiu]

I'm using LilyPond version 2.4.2 (out of portage). As
I found in the archives of the LilyPond lists, other
people have experienced my problem in older versions
of LilyPond: heading text and/or staff lines are
overshooting the right margin of the page. One user
fixed this problem in version 2.3.15 by making
settings in a \bookpaper block
(http://lists.gnu.org/archive/html/bug-lilypond/2004-09/msg00093.html),
but \bookpaper seems to have disappeared in version
2.4. I did not find any other way to fix this problem
for version 2.4. By setting the linewidth, I can get
the staves to fit in the page, but the composer line
still runs past the margin. Any ideas? Here are the
files I'm working on. All of the included files follow
the same format as trumpet.ly (pasted below main.ly).
Thanks!

-------------------------------------------------------
% main.ly

\version "2.4.2"

\header
{
        title = "Second Semester Composition"
        composer = "Anne, Joey, Serban, Will"
        tagline = "" % clear the Lilypond signature
}

\paper
{
        #(set-paper-size "letter" 'landscape)
        leftmargin = 1.0\in
}

\layout
{
        %linewidth = 9.5\in
        indent = 0\in
}

global = 
{
        \time 4/4
}

\include "trumpet.ly"
% more \include lines follow

\new StaffGroup
<<
        \override Score.BarNumber #'break-visibility =
#end-of-line-invisible
        
        \new Staff \trumpet
% more \new Staff lines follow
>>

-------------------------------------------------------
% trumpet.ly

trumpet =
{
        \set Staff.instrument = "Trumpet"
        \set Staff.instr = "Trumpet"
        
        \override Staff.TimeSignature #'style = #'()
        
        \clef treble
        \key d \major
        
        \relative
        {
                fis'4 fis2 fis4  |  fis4 fis2 fis4  |  d4 d d d  | 
a'1  |  d,2. a'8 a  |  a8 a d,2.  |  e2 e  |  a4 a r2 
|  % 1-8
        }
}
-------------------------------------------------------

Serban Giuroiu
http://javatheory.net

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