Ties between chord notes change direction over a barline

[James Harkins]

> I'm not top-posting

Here's a case where the tie configuration is calculated 
differently depending on a factor that should make no 
difference: whether or not the tie crosses the bar line.

Possible to work around more or less by an override, although 
#'tie-configuration is not the easiest one to work with and the 
results here are less than professional.

\version "2.15.36"

\score {
  \relative c' {
    <c d e g a>4^"tie w/in bar" ~ q4 r4

    <c d e g a>4^"tie over bar" ~ q4
    r4 r4

    \override TieColumn #'tie-configuration
      = #'((0 . 1) (-1.5 . 1) (-3.5 . 1) ( -6.0 . -1) (-7.0 . -1))
    <c d e gs a>4^"closer; not perfect" ~ q4

    r4 r2
  }
  % this is there only to increase the amount of space
  % so you can see what the ties are really doing
  \layout {
    \context {
      \Score
      \override SpacingSpanner
        #'base-shortest-duration = #(ly:make-moment 1 16)
    }
  }
}