Re: [Lilypond-auto] Issue 1698 in lilypond: Slurs and ties are not correct over repeats

[lilypond]

Comment #69 on issue 1698 by address@hidden: Slurs and ties are not  
correct over repeats
http://code.google.com/p/lilypond/issues/detail?id=1698

Since it seems we will postpone applying the correct fix (though we can  
still prepare the fix now) I'll record thoughts before I forget.

Using the \free( concept from the patch above, I think we want to :
remember each slur that is active at the entry to the alternatives,  
preferably its direction as well, and generate a corresponding \free( event  
at the start of the 2nd and later alternatives;
remember each slur crossing the beginning of a repeat volta, and generate a  
corresponding \free) at the end of each alternative except the last.

Ideally, the slurs would be found and \free)( generated in each Voice  
sharing the same Timing_engraver, otherwise we need to document that a  
\repeat volta structure needs to be in the each voice that has slurs to be  
broken duplicated.

\version "2.17.16"
{ R1
  \repeat volta 2
  { r4 g'(  a' b' }
  \alternative {
    { f') r2. }
    { \free^( f'4) r g'2( } }
  a'1) \bar "|." }

{ r4 g'( a' b'
  \repeat volta 2
  { f') r2. }
  \alternative {
    { r4 g'( a' b'4  \free) }
    { r2 g'2( } }
  a'1) \bar "|." }

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