Should slurs really start before the key signature?

[arvidgr]

...unlike ties and phrasing slurs?

This one looks strange with both latest 2.10 and 2.11 IMO; I can't get
2.8 to run at the moment to check if this is a regression or not.

-- Arvid

\version "2.8.1"

\score {

  \context Score <<
    
    \relative c'' { \key c \minor c c\( c( c~ |\break c d) c\) c }
  >>
  \layout {}
 }