manual beams can run off edge of paper

[Jeremy Mates]

> I would rather be top posting!

Manual beaming can cause the music to run off the edge of the paper, and
otherwise screw up the entire rendition. This can be worked around by not
manually beaming, but can happen any time a manual beam spans a measure that
lilypond wants to wrap below the existing staff line due to hitting the edge of
the paper. Ideally lilypond would somehow automatically interrupt the manual
beaming should the staff need to be wrapped.

\version "2.14.0"

eg = {
  g8[ g g g g g g g g g g g g g g g g g g g g g g g g g g g g]
}

\book {
  \paper {
    #(set-paper-size "a7")
  }
  \score {
    \new Staff << \eg >>
    \layout { }
  }
}