Piano phrasing slur collision with lyrics

[Hayden Muhl]

> I'm not top posting

\version "2.12.3"

%{
Phrasing slur becomes highly eccentric within a single voice when it must move 
across piano staves, and does not detect collision with lyrics on an adjacent
staff.

Specifically related to when the slur is forced to the up direction, either by
voicing (as per this example) or by a macro like \phrasingSlurUp 
%}

\score {
    <<
        \context Staff = "voice" \relative c'' {
            \time 4/2
            c4 c c c c c c c
        }
        \addlyrics {
            foo foo foo foo foo foo foo foo 
        }
        \new PianoStaff 
        <<
            \context Staff = "pianoRh" {
                << {
                \change Staff = pianoLh
                e''4\(
                \change Staff = pianoRh
                e'' c'1 c''2\)
                } \\ {} >> 
            }
            \new Staff = "pianoLh" {
                s\breve
            }
        >>
    >>
}