Bug references in newsticker's docstrings

["Juanma Barranquero" <lekktu@gmail.com>]

net/newsticker.el contains some bits from its pre-CVS past that should
be updated:

  (defun newsticker--insert-image (img string)
   "Insert IMG with STRING at point.
 This is a work-around for a strange behavior of Emacs versions before
 21.3.50.  Images inserted with `insert-image' vanished after doing
 `fill-region'."
   ;; This should work:
   ;;(insert-image img string)
   ;; but it does not. Therefore we do this, which should be equivalent!
   (let ((pos (point)))
     ;;(insert string)
     (insert ":-)")
     (add-text-properties pos (point) (list 'display img))))

  (defun newsticker--buffer-redraw ()
   "Sometimes (CVS) Emacs forgets to update the window..."
   (if (fboundp 'force-window-update)
       (force-window-update (current-buffer))
     (redraw-frame (selected-frame)))
   (run-hooks 'newsticker-buffer-change-hook)
   (sit-for 0))

At the very least, the docstrings should be changed IMO. But the
question is: are they still relevant, i.e., do they refer to real
bugs, or it is now cargo cult and should be fixed?

AFAICS, the comment in `newsticker--insert-image' is not true anymore
(at least, no image has vanished in my tests).

`newsticker--buffer-redraw' is used mostly after calling
`add-to-visibility-spec' and `remove-from-visibility-spec', and in two
cases after adding or removing text properties. Should
`force-window-update' (or even `redraw-frame') be necessary after
that? (If so, `force-window-update' can be directly called, as it is
always going to be defined anyway.)

                    /L/e/k/t/u