bug#17775: 24.4.50; `ispell-command-loop` -- portion of code occasionally returns `nil`.

[Keith David Bershatsky]

My average `(window-width)` is 168 with `linum-mode` active.   I have 
`visual-line-mode` active.  As to the first frame that is generated by Emacs, 
scroll bars are removed with code when Emacs starts -- 
`(modify-all-frames-parameters (list (cons 'vertical-scroll-bars nil)))` -- 
this ensures that my initial calling of `toggle-frame-maximized` (when Emacs 
loads) expands the frame to the full screen width.  As to each new frame, 
scroll bars are not initially present -- `(add-to-list 'default-frame-alist 
'(vertical-scroll-bars . nil))`.  Scroll bars are added or removed with a minor 
mode that calculates whether the the text is longer than the visual window -- 
`(set-window-scroll-bars selected-window 0 'right nil)` or 
`(set-window-scroll-bars selected-window 0 'right nil)`.   Scroll bar mode is 
now on an idle timer, but was previously on the `post-command-hook` -- the 
spell check error occurs sporadically in either circumstance.

My linum-mode is using a modified version of something I borrowed from 
Stackoverflow:

http://stackoverflow.com/a/10593165/2112489

(defun my-lawlist-linum-get-format-string ()
  (let* ((width (length (number-to-string
                             (count-lines (point-min) (point-max)))))
         (format (concat "%" (number-to-string width) "d")))
    (setq my-lawlist-linum-format-string format)))

I apologize for not writing up a better initial bug report and I'll update this 
bug report when I have more useful information.  You are correct in your 
assumption that the only evidence I have (that the code snippet caused the 
problem) iss that the error seems to go away by commenting it out.

Keith

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On Jun 14, 2014, at 1:13 AM, Eli Zaretskii wrote:
> 
> Btw, what was the width of the window when this problem happened?