Melismata at end of line aren't aligned properly

[Peter Budny]

When a word at the end of a line would run off the page, it is normally shifted
left to avoid this. However, when that word also is extended with a melisma,
Lilypond follows the melisma behavior, which is to left-align the word with the
note, causing it to run off the page.

The following code fragment should show clearly what I mean:

\version "2.11.27"
\score {
  \new StaffGroup <<
    \new Voice = "abc" {
      \relative c'' {
        c4( c4) c4 c4
        \break
        c2. c4(
        \break
        c4) c4 c2
      }}
    \new Lyrics {
      \lyricsto "abc" {
        foo __ bar really-long-word-at-the-end-of-a-line
        baz really-really-long-word-at-the-end-of-a-line __
        quux quuux
      }}>>}