needs-update

Called by the editor to request a refresh to its displayed representation. When the administrator decides that the displayed should be refreshed, it calls the editor's refresh method.

• (send an-editor-admin needs-update localx localy w h) -> void
      localx : real number
      localy : real number
      w : non-negative real number
      h : non-negative real number

  The localx, localy, w, and h arguments specify a region of the editor to be updated (in editor coordinates).