<<\\>> notation and grace notes broken.

[Erik Sandberg]

Hi,
I added this as polyphony-grace.ly.

%
%Erik Sandberg

\header {
texidoc = "The << \\\\ >> syntax for polyphony doesn't work if the second 
voice starts with a grace note.

Workaround: Add \\voiceTwo after the grace note."

reportedin = "2.5.31"
}
\version "2.5.31"
\layout {raggedright=##t}
\new Staff <<c4 \\ {\grace b16 b4}>>


-- 
Erik Sandberg
Maintainer of the Lilypond bug CVS archive,
http://savannah.gnu.org/cgi-bin/viewcvs/lilypond/lily-bugs/bugs/
http://lilypond.org/doc/v2.5/bugs/out/index.html