(X-extent . ,ly:arpeggio::width)
(Y-extent . ,(grob::unpure-Y-extent-from-stencil ly:arpeggio::pure-height))
(X-offset . ,ly:side-position-interface::x-aligned-side)
(X-extent . ,ly:arpeggio::width)
(Y-extent . ,(grob::unpure-Y-extent-from-stencil ly:arpeggio::pure-height))
(X-offset . ,ly:side-position-interface::x-aligned-side)