Lyric misalignment during slurs

[Evan Ross]

> I'm not top posting.

%%Lyrics do not align among voices when one voice has a slur and another
%doesn't. 

%%The problem persists even when using a phrasing slur instead. 

%%I have not been able to find in any documentation a way to align them
%properly.

\version "2.12.3"

\paper{ ragged-right=##t }
\score {
<<
\new Staff << 
\time 4/4
\key c \major
\new Voice = "one" \relative c'' 
{ 
c2 b4 ( a ) |
c1 | \break
c2 b4 \( a \) |
c1 |
}
\addlyrics {
I love __ 
you. 
I love __ _ 
you.
}
>>
\new Staff <<
\time 4/4
\key c \major 
\new Voice = "two" \relative c'
{
e2 f |
g ( e ) | \break
e2 f | 
g \( e \) |
}
\addlyrics {
I love
you. __ 
I love
you. __ _
} 
>>
>>
}