Issue 1577 in lilypond: GrandStaff cannot contaiin RhythmicStaff

[lilypond]

Status: Accepted
Owner: address@hidden
Labels: Type-Defect Priority-High Patch-review

New issue 1577 by address@hidden: GrandStaff cannot contaiin  
RhythmicStaff
http://code.google.com/p/lilypond/issues/detail?id=1577

Issue added for tracking purposes.

Reported by Hu Haipeng and clarified by Reinhold:
That's simply a bug in lilypond's engraver-init.ly file. In particular, a
GrandStaff was allowed to only contain Staff contexts, but no RhythmicStaff.
As a consequence, no GrandStaff was ever created (as Francisco also noticed,
there was no brace shown, either) and all the RhythmicStaff contexts were
placed directly into the StaffGroup...

See discussion in  
http://article.gmane.org/gmane.comp.gnu.lilypond.general/63127
and Reinhold's patch in http://codereview.appspot.com/4275068.
The patch compiles against 2.13.56 and shows a change in  
hara-kiri-tabstaff.ly but I'm guessing this is intended.