Comment #13 on issue 2584 by [email protected]: please make partcombine merge slurs
http://code.google.com/p/lilypond/issues/detail?id=2584
Does this patch result in cases where "clearly wrong manual input gets let through and interpreted in interesting ways" ?
Version 2.15.39 interprets \relative c'' { c(( d) e) } as a nested slur (who asked for that?) but interprets \relative c'' { c( d( e)) } as an error.
After this patch we treat (( as if it were (, and )) as if ), which seems a non-interesting interpretation, and rather similar to the way Lilypond treats {\clef bass \clef bass}.
