partial chord ties in second alternative

[Patrick Schmidt]

hi folks,

is there a way to achieve repeated ties of selected notes of a chord in an 
alternative ending (apart from using a "polyphonic approach" in a homophonic 
context)?

e.g.

\repeat volta 2 {
   <e b e~ g~ b~ e~>1
}
\alternative {
   { <c e g b e>1 }
   { <c e g b e>1 }
}

The \repeatTie command can only be used outside of chords which would create an 
open tie for all the notes of the chord in the second alternative. But here I 
would like to engrave a repeated tie only for the higher notes (e g b e) of the 
chord.

Thanks for any hint!

patrick
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