Comment #64 on issue 2801 by [email protected]: Patch: Approximates cross-staff slurs in VerticalAxisGroup vertical-skylines.
http://code.google.com/p/lilypond/issues/detail?id=2801
The collision in the Chopin is from the fix for issue 2589 within this patch. I had set Fingering to 'avoid-slurs on the inside for that piece, so the fingering and accent on the same note in measure 85 <http://k-ohara.oco.net/Lilypond/chopin_prelude_op45_slurs.pdf> had inconsistent placement instructions, which LilyPond formerly resolved somehow.
I have been thinking about making the option for Scripts and such things to "avoid-slur = outside" apply for normal Slurs only, letting Scripts go inside cross-staff Slurs. The need to let Fingering inside cross-staff slurs was my reason for the troublesome override in Chopin Op45.
If we stop trying to place Scripts, etc., outside cross-staff Slurs then we can keep the usual collision avoidance for those Scripts, etc.
