(parent-alignment-X . ,CENTER)
(slope . ,ly:stem-tremolo::calc-slope)
(stencil . ,ly:stem-tremolo::print)
- (style . ,ly:stem-tremolo::calc-style)
+ (shape . ,ly:stem-tremolo::calc-shape)
(X-extent . ,ly:stem-tremolo::width)
(X-offset . ,ly:self-alignment-interface::aligned-on-x-parent)
(Y-extent . ,(grob::unpure-Y-extent-from-stencil ly:stem-tremolo::pure-height))