The skylines are used as part of VerticalAlignment, to figure out how
> far apart the children of VerticalAlignment (ie. VerticalAxisGroups for > staves, lyrics, etc) need to be. Once we compute the translations of the > children of VerticalAlignment, we can compute the height of > VerticalAlignment (and thus the height of System). I understand that this is the general idea how it is supposed to be. What happens in reality, is that pure_height() of the VerticalAxisGroup, calling ly:hara-kiri-group-spanner::y-extent in Scheme land, calling back Hara_kiri_group_spanner::pure_height(), ultimately ends up in Axis_group_interface::cached_pure_height(). That function, unite()'s the begin_of_line_pure_height() and the rest_of_line_pure_height(), which are simply measured from the middle line of the staff, no translations. This is the exact point where I am most confused -- what is the supposed result of these translations? So far in the debugger I only see values relative to the middle line; what is the idea what these translations are supposed to be?
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