allout-redecorate-item is a compiled Lisp function in `allout-widgets.el'.

(allout-redecorate-item ITEM-WIDGET)

Resituate ITEM-WIDGET decorations, disregarding context.

Use this to redecorate only the item, when you know that its
situation with respect to siblings, parent, and offspring is
unchanged from its last decoration. Use
`allout-decorate-item-and-context' instead to reassess and adjust
relevant context, when suitable.