DOC: NR at another @knownissue for Grace Notes

Add known issue for Grace Notes used in 'many' voices

Currently this is Tracker Issue 667

@lilypond example shows how to overcome grace note issues in 'complex' voice settings

diff --git a/Documentation/notation/rhythms.itely b/Documentation/notation/rhythms.itely
index 40fc4ec61091c45c040027ace5b0a9321f986ee9..e2ab6d22300a989916f3d0eaf37bc4dd8f7c1069 100644 (file)
--- a/Documentation/notation/rhythms.itely
+++ b/Documentation/notation/rhythms.itely
@@ -3212,10 +3212,38 @@ durations in the other staves.  For the above example
 >>
 @end lilypond
 
 >>
 @end lilypond
 

+The use of grace notes within voice contexts confuses the way the
+voice is typeset. This can be overcome by inserting a rest or note
+between the voice command and the grace note.
+
+@lilypond[quote,verbatim]
+accMusic = {
+  \acciaccatura { f8 } e8 r8 \acciaccatura { f8 } e8 r4
+}
+
+\new Staff {
+  <<
+    \new Voice {
+      \relative c'' {
+        r8 r8 \voiceOne \accMusic \oneVoice r8 |
+        r8 \voiceOne r8 \accMusic \oneVoice r8 |
+      }
+    }
+    \new Voice {
+      \relative c' {
+        s8 s8 \voiceTwo \accMusic \oneVoice s8 |
+        s8 \voiceTwo r8 \accMusic \oneVoice s8 |
+      }
+    }
+  >>
+}
+@end lilypond
+

 Grace sections should only be used within sequential music
 expressions.  Nesting or juxtaposing grace sections is not
 supported, and might produce crashes or other errors.
 
 Grace sections should only be used within sequential music
 expressions.  Nesting or juxtaposing grace sections is not
 supported, and might produce crashes or other errors.
 

+

 @node Aligning to cadenzas
 @unnumberedsubsubsec Aligning to cadenzas
 
 @node Aligning to cadenzas
 @unnumberedsubsubsec Aligning to cadenzas