I might have a test case for you at http://www.mutopiaproject.org/cgibin/piece-info.cgi?id=1776
It seems you copy each slur into a "slur-stub", and from those keep only the ones with "cross-staff" set. Then when figuring system skylines you insert all Grobs with the slur-stub-interface into the skylines for each staff. Why not insert the original Slur into the skylines, if it has "cross-staff" instead of the SlurStub. For that matter, why not insert all Grobs marked "cross-staff"? all the cross-staff http://codereview.appspot.com/6498077/ _______________________________________________ lilypond-devel mailing list lilypond-devel@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-devel