bug when slur incorporates acciaccatura

[Ruud van Silfhout]

The following snippet produces incorrect output. The first measure should 
be the combination of measure 2 and measure 3 i.e. the slur starting on 
the first note of the measure should end on the last note of the measure. 
As a consequence of the error, lyrics tied to the staff gets positioned wrongly 

\version "2.14.1"

\relative c'' {
  c4(  c8 \acciaccatura { d16[ e d] } c8 c4 ~ c4)  |
  c4(  c8 c8 c4 ~ c4) |
  c4  c8 \acciaccatura { d16[ e d] } c8 c4 ~ c4
}