+; this is for 2-pass spacing. Delete me.
+(define (stretchable-line? line)
+ "Say whether a system can be stretched."
+ (not (or (ly:prob-property? line 'is-title)
+ (let ((system-extent (paper-system-staff-extents line)))
+ (= (interval-start system-extent)
+ (interval-end system-extent))))))
+