Re: [Lilypond-auto] Issue 3385 in lilypond: Ottava with cross-staff messes up beams

[lilypond]

Comment #23 on issue 3385 by address@hidden: Ottava with cross-staff   
messes up beams
http://code.google.com/p/lilypond/issues/detail?id=3385

The reason to fix this know is that we might still remember he intent of  
the patch for issue 3199:
"  A Scheme function is no longer needed to determine pure relevant grobs.
   All grobs can have their Y-extents meaningfully pure-evaluated now. The
   worst-case scenario is that they evaluate to false."

The 'pure-relevant' grobs are the graphical objects that are included  
(relevant) in the estimated (pure) height of the staff---the height used to  
choose page-breaks.  Now that all items on the staff are included, the  
question is: what should we use for their estimated (pure) Y-extents ?

In the example at the top, we do not yet know if the beams should knee, but  
want to estimate the height of the staves.  What do we want to use for  
estimated (pure) Y-extents of the stem, beam and 8va bracket ?

I suggest,
cross-staff beam: false (do not count it, possibly letting it overlap  
another staff)
cross-staff stem: the union of Y-extents of un-beamed stems pointing up and  
down
8va bracket: the Y-extent it would have if placed over the stem extents  
estimated just above

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