edit-menu:find-on-demand in frame:standard-menus<%>

The menu item's on-demand method calls this method

• (send a-frame:standard-menus edit-menu:find-on-demand item) -> void
     item : menu-item%

  Defaultly is this: (λ (item) (send item enable (let ((target (get-edit-target-object))) (and target (is-a? target editor<\%>)))))