(SeparationItem
. (
- (X-extent . #f)
- (Y-extent . #f)
+ (avoid-slur . inside)
+ (X-extent . ,ly:axis-group-interface::width)
+ (Y-extent . ,ly:axis-group-interface::height)
(meta . ((class . Item)
(interfaces . (spacing-interface
separation-item-interface))))))