Re: still no ultimate way to create three-staff piano layout

[David Kastrup]

Keith OHara <address@hidden> writes:

> Eluze <eluzew <at> gmail.com> writes:
>
>> karol wrote
>> > This doesn't solve the problem. Look at the example. In the first system
>> > spacing is proper, but in the second, distance between 'b' and 'd' is 9
>> > (should be 10.5).
>> 
>> I think this is a paradoxical situation:
>> 
>> if a staff (group) is removed then the vertical spacing of the staff group
>> above is applied
>> 
>
> If I understand, the PianoStaff inside StaffGroup should be treated as a 
> group for purposes of removing empty staves together, but not treated as a 
> group for purposes of spacing.
>
> The StaffGrouper, that makes different spacing at the end of a group, is
> created by the Vertical_align_engraver (despite what the manual says) so
> if you remove the Vertical_align_engraver form the PianoStaff, only the
> enclosing StaffGroup will have the appearance of a group.

Does that mean that the patch pushed in
<URL:http://code.google.com/p/lilypond/issues/detail?id=3641#c7> (why
has the issue been reopened instead of creating a new one for the
documentation) is incomplete?  The effect of the patch should be that
nested "Vertical_align_engraver"s behave as if the inner engravers have
been removed altogether.

Doesn't it do that job completely, and if not, what is it that causes
the difference?

-- 
David Kastrup