lines)
(if (= (length lines) 1)
'((0 . 0))
- '())) ))
+ '()))))
(real-extents
(list->vector
(append
(lambda (sys) (ly:paper-system-extent sys Y)) lines)
(if (= (length lines) 1)
'((0 . 0))
- '()) )))
+ '()))))
(no-systems (vector-length real-extents))
(topskip (interval-end (vector-ref real-extents 0)))
(space-left (- page-height