static void add_side_positioned (Grob *, Grob *);
DECLARE_SCHEME_CALLBACK (before_line_breaking, (SCM));
DECLARE_SCHEME_CALLBACK (row_before_line_breaking, (SCM));
static void add_side_positioned (Grob *, Grob *);
DECLARE_SCHEME_CALLBACK (before_line_breaking, (SCM));
DECLARE_SCHEME_CALLBACK (row_before_line_breaking, (SCM));