http://codereview.appspot.com/6294047/diff/4/lily/slur-engraver.cc
File lily/slur-engraver.cc (right):

http://codereview.appspot.com/6294047/diff/4/lily/slur-engraver.cc#newcode220
lily/slur-engraver.cc:220: ev->origin ()->warning (_ ("already have
slur"));
You could simply finish here, with
    }
    start_events_.erase (start_events_.begin () + i);
    break;
  }
replacing everything through line 258.  Then you simply keep the
direction of first slur-event you saw.

http://codereview.appspot.com/6294047/diff/4/lily/slur-engraver.cc#newcode238
lily/slur-engraver.cc:238: // be decidedly strange for manual input.
When each of the parts being combined is a few pages long, I find I
write a few inconsistencies equivalent to

  \partcombine {c''2^( d'')} {c'2( d')}

The slurs are then silently dropped, for complicated reasons.

http://codereview.appspot.com/6294047/diff/4/lily/slur-engraver.cc#newcode246
lily/slur-engraver.cc:246: Direction slur_dir = to_dir
(slurs_[j]->get_property ("direction"));
This call might wait to see the layout under the slur, including effects
of line-breaks, before reporting back.  If you understand "pure" in
LilyPond, you can use get_pure_property()

http://codereview.appspot.com/6294047/

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