(SpanBarStub
. (
(X-extent . ,grob::x-parent-width)
- (Y-extent . ,(ly:make-unpure-pure-container #f ly:axis-group-interface::pure-height))
+ (extra-spacing-height . ,pure-from-neighbor-interface::extra-spacing-height)
+ (Y-extent . #f)
(meta . ((class . Item)
(object-callbacks . ((pure-Y-common . ,ly:axis-group-interface::calc-pure-y-common)
(pure-relevant-grobs . ,ly:pure-from-neighbor-interface::calc-pure-relevant-grobs)))