ewoc-filter

ewoc-filter is a compiled Lisp function in `ewoc.el'.

(ewoc-filter EWOC PREDICATE &rest ARGS)

Remove all elements in EWOC for which PREDICATE returns nil.
Note that the buffer for EWOC will be current-buffer when PREDICATE
is called. PREDICATE must restore the current buffer before it returns
if it changes it.
The PREDICATE is called with the element as its first argument. If any
ARGS are given they will be passed to the PREDICATE.