wrong tuplet number positioning (bug?)

[Alexander Rose]

Hello,

as you can see in the attached file, tuplet numbers are not  
positioned nicely, when the tuplet crosses staffs. maybe this is  
regarded as a bug.

another question: for asthetics i want that the accidential in the  
second bar (lower staff) not to claim space as if there where no  
staff crossing. can you have an object that is visible, but does not  
claim any space?

temp.ly
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