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| superclass: dllist<%> | ||||
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constructor
(new horizontal-alignment% [parent parent] [ [show? show?] [after after]]) → (is-a?/c horizontal-alignment%) parent : (is-a?/c alignment-parent<%>) show? : boolean? = #t after : (or/c (is-a?/c alignment<%>) false/c) = #f 
Inserts a new horizontal-alignment container into
parent—