Fix 442.

Fix 442.

Add an engraver which keeps all of the staves below
it alive together.

[Neil Puttock, 2010-08-04 21:57:20]

Hi Joe,

LGTM.

I'd be quite happy with this method, even though it loses a bit of flexibility
in comparison with your original patch.

Cheers,
Neil

http://codereview.appspot.com/1888042/diff/1/5
File lily/keep-alive-together-engraver.cc (right):

http://codereview.appspot.com/1888042/diff/1/5#newcode69
lily/keep-alive-together-engraver.cc:69: "All the Hara_kiri_group_spanners that
lie below "
Could this docstring be a bit more user-friendly?

http://codereview.appspot.com/1888042/diff/1/7
File scm/define-grob-properties.scm (right):

http://codereview.appspot.com/1888042/diff/1/7#newcode956
scm/define-grob-properties.scm:956: (keep-alive-with ,ly:grob-array? "An array
of other VerticalAxisGroups.
@code{VerticalAxisGroup}s

[joeneeman, 2010-08-06 21:57:28]

On 2010/08/04 21:57:20, Neil Puttock wrote:
> Hi Joe,
> 
> LGTM.
> 
> I'd be quite happy with this method, even though it loses a bit of flexibility
> in comparison with your original patch.

Thanks, fixed and pushed. I don't particularly see much use for the original
flexibility, but we can always add it on later. It would just be a new interface
anyway to the same backend code anyway.

Cheers,
Joe