used.")
(parent-alignment-Y ,number? "Like @code{parent-alignment-X}
but for the Y@tie{}axis.")
+ (parenthesis-friends ,list? "A list of Grob types, as symbols.
+When parentheses enclose a Grob that has 'parenthesis-friends, the
+parentheses widen to include any child Grobs with type among
+'parenthesis-friends.")
(parenthesized ,boolean? "Parenthesize this grob.")
(positions ,number-pair? "Pair of staff coordinates
@code{(@var{left} . @var{right})}, where both @var{left} and