bug#728: marked as done (23.0.60; flyspell checking is sometimes silently disabled)

[don@donarmstrong.com (Emacs bug Tracking System)]

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Your message dated Tue, 16 Sep 2008 20:59:57 -0400
with message-id <87fxnzr3hu.fsf@cyd.mit.edu>
and subject line Re: 23.0.60; flyspell checking is sometimes silently disabled
has caused the Emacs bug report #728,
regarding 23.0.60; flyspell checking is sometimes silently disabled
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

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From: Markus Triska <markus.triska@gmx.at>
To: emacs-pretest-bug@gnu.org
Subject: 23.0.60; flyspell checking is sometimes silently disabled
Date: Sat, 16 Aug 2008 00:20:22 +0200 (CEST)
Message-ID: <20080815222022.E7882A30C89@mt-computer.local>


Sometimes in flyspell-mode, the mode line still says "Fly", but no
more flychecking is actually performed. I cannot yet reproduce it
reliably; however, if you add the following to your .emacs:

   (defun my-flyspell-check ()
     (when flyspell-mode
       (unless (memq 'flyspell-post-command-hook post-command-hook)
         (with-current-buffer (get-buffer-create "flywarn")
           (insert "flychecking inactive despite flyspell-mode!\n"))
         (display-buffer  "flywarn"))))

   (setq flycheck-timer (run-with-timer 0 0.5 'my-flyspell-check))

you will be informed when flyspell mode is superficially active, but
no checking is actually performed. I only encountered the problem once
since I have the above code in my .emacs, and then I also saw:
"Invalid search bound (wrong side of point)" in *Messages*, which I
previously probably missed. Thus I think this could for example happen
when switching buffers or using the minibuffer at the wrong time.

It is clear that flyspell-post-command-hook must be removed from
post-command-hook in case of errors; if the error is hard to catch in
the hook, I would already find it an improvement if flyspell mode were
cleanly disabled (existing underlines, mode line, ...) in such cases.

In GNU Emacs 23.0.60.1 (i386-apple-darwin8.11.1, GTK+ Version 2.12.9)
 of 2008-08-15 on mt-computer.local
Windowing system distributor `The XFree86 Project, Inc', version 11.0.40400000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t




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From: Chong Yidong <cyd@stupidchicken.com>
To: Markus Triska <markus.triska@gmx.at>
Cc: 728-done@emacsbugs.donarmstrong.com
Subject: Re: 23.0.60; flyspell checking is sometimes silently disabled
Date: Tue, 16 Sep 2008 20:59:57 -0400
Message-ID: <87fxnzr3hu.fsf@cyd.mit.edu>

> The following patch fixes this problem for me:

Checked in, thanks.