Re: [Lilypond-auto] Issue 1789 in lilypond: \tweak does not work for changing control-points of any but the first tie in chorded notes

[lilypond]

Comment #7 on issue 1789 by address@hidden: \tweak does not work for  
changing control-points of any but the first tie in chorded notes
https://code.google.com/p/lilypond/issues/detail?id=1789

Workaround: set the directions explicitly so we don't need TieColumn.
The TieColumn code calls Tie::get_control_points(), which fails to check if  
we have made an override

{ < c'-\tweak color #red _~
    e'-\shape #'((0 . 0)(-1 . 0)(1 . 0)(0 . 0)) ^~
    g'-\tweak color #blue
      -\tweak control-points #'((2 . 0)(3 . 2)(3 . 2)(4 . 0)) ^~
    c''-\shape #'((0 . 0)(4 . 1)(-4 . 1)(0 . 0)) ^~
    g'' ^~
  >
  % if we use \once, we have to put it at the time-step where the ties  
*complete#
  \once\override TieColumn.positioning-done = #'()
  q }


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