ewoc-locate
ewoc-locate is a compiled Lisp function in `ewoc.el
'.
(ewoc-locate EWOC &optional POS GUESS)
Return the node that POS (a buffer position) is within.
POS may be a marker or an integer. It defaults to point.
GUESS should be a node that it is likely to be near POS.
If POS points before the first element, the first node is returned.
If POS points after the last element, the last node is returned.
If the EWOC is empty, nil is returned.