First stab at merge-rests-on-positioning

[Wilbert Berendsen]

Op dinsdag 17 augustus 2010 schreef Xavier:

> On Fri, Jun 11, 2010 at 3:27 PM, Xavier Scheuer <address@hidden> wrote:
>> Could you implement the possibility:
>>  \override RestCollision #'positioning-done =
>> #merge-rests-on-positioning described in
>> http://lsr.dsi.unimi.it/LSR/Item?id=336
>> _directly_ into LilyPond?
> 
> Graham wrote: Patches will be reviewed.

This is my first stab at this. It just uses the code in LSR336 but provides a 
few convenience commands.

The major limitation is that multimeasure rests are not yet taken into 
account: they are simply moved to the central staff position, whether they 
occur in both voices or not.

AFAICT MultiMeasureRest objects do not take part in some collision. Is there a 
way to get the other one in the other voice in a staff? Then I could write a 
function to assign to the 'Y-offset property of the MMrest.

If the MMrests function well, this file could be added to the ly/ directory of 
lilypond, it could then be included if people want to use the functionality.

best regards,
Wilbert Berendsen

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merge-rests.ily
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