Re: Why is NonMusicalPaperColumn.line-break-system-details.extra-offset "upside down"?

[Carl Sorensen]

On 1/1/22, 2:05 PM, "Kieren MacMillan" <kieren@kierenmacmillan.info> wrote:

    Hi Carl,
    
    > I assume it is because the negative offset reduces the skyline of the 
broken (following) system, which allows the spacing engine to raise that system.
    
    But extra-offset doesn't (or at least shouldn't) affect the spacing engine, 
right?

extra-offset affects the position of grobs *relative to the staff containing 
them*.  When the Y position of a grob is increased, it either has no affect on 
the location of the staff, or it lowers the staff due to required spacing from 
the staff above.  Since after-line-breaking is the bottom staff, a positive Y 
extra-offset value should have no affect or lower the bottom staff, to be 
consistent with positive Y extra-offset for every other grob on the staff, it 
seems to me.

extra-offset doesn’t change the staff-staff spacing parameters, but it does 
change the grob locations used in the staff-staff spacing calculations.

I think this is all consistent, but I could be wrong.

Carl