tree-widget-lookup-image
tree-widget-lookup-image is a compiled Lisp function in `tree-widget.el
'.
(tree-widget-lookup-image NAME)
Look up in current theme for an image with NAME.
Search first in current theme, then in parent themes (see also the
function `tree-widget-set-parent-theme').
Return the first image found having a supported format, or nil if not
found.