(let*
(
(mol (callback grob))
- (x-ext (widen-interval (ly:molecule-get-extent mol 0) x-padding))
- (y-ext (widen-interval (ly:molecule-get-extent mol 1) y-padding))
- (x-rule (make-filled-box-molecule (widen-interval x-ext line-thick)
+ (x-ext (interval-widen (ly:molecule-get-extent mol 0) x-padding))
+ (y-ext (interval-widen (ly:molecule-get-extent mol 1) y-padding))
+ (x-rule (make-filled-box-molecule (interval-widen x-ext line-thick)
(cons 0 line-thick)))
(y-rule (make-filled-box-molecule (cons 0 line-thick) y-ext))
)