allout-next-sibling
allout-next-sibling is a compiled Lisp function in `allout.el
'.
(allout-next-sibling &optional DEPTH BACKWARD)
Like `allout-forward-current-level', but respects invisible topics.
Traverse at optional DEPTH, or current depth if none specified.
Go backward if optional arg BACKWARD is non-nil.
Return the start point of the new topic if successful, nil otherwise.