bug#39898: 28.0.50; The off-by-one bug in `flyspell-check-previous-highlighted-word'

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

> The test case, AFAIU, creates a situation where the misspelled word
> starts _after_ point (remember that point is a place between 2
> characters, and its value is the character following point).  So I
> don't see a bug here.  Am I missing something?

No, the misspelled word starts before point.  Note that `insert' moves
point to after the inserted text.

(with-temp-buffer
  (select-window (display-buffer (current-buffer)))
  (insert "appl")
  (message "%s" (point)) ; 5
  (flyspell-buffer)
  (flyspell-check-previous-highlighted-word))

The problem is there even if you type a misspelled word manually at
(point-min) and run `flyspell-check-previous-highlighted-word'.