NR: repeat slurs and glissando workaround

[Federico Bruni]

http://lilypond.org/doc/v2.15/Documentation/notation/long-repeats#index-repeat-and-slur

NR 1.4.1, Normal Repeats, Known issues and warnings

"Slurs that span from a \repeat block into an \alternative block will 
only work for the first alternate ending."

Why don't suggest a workaround?
I know, it's the usual workaround (\hideNotes + grace note), but it may 
be useful for beginners.
It's a bit tricky in polyphonic music, since you must be aware of the 
grace syncronization problem (it was called this way?).

I'm in a hurry, I have to catch a train.
Find examples attached.

Thanks,
Federico

repeat-slur-glissando-monophonic.ly
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repeat-slur-glissando-polyphonic.ly
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