+(define-public (self-alignment-interface::self-aligned-on-breakable grob)
+ "Return the @code{X-offset} that places @var{grob} according to its
+ @code{self-alignment-X} over the reference point defined by the
+ @code{break-align-anchor-alignment} of a @code{break-aligned} item
+ such as a @code{Clef}."
+ (+ (ly:break-alignable-interface::self-align-callback grob)
+ (ly:self-alignment-interface::x-aligned-on-self grob)))
+