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From: Christopher Schmidt <christopher@ch.ristopher.com>
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Subject: gnus-message-citation-mode resets font-lock
Date: Thu, 08 Mar 2012 06:57:19 +0100
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Hey gurus,

I have a problem with Ma Gnus v0.3 (I am using the tagged one from git
repo) on GNU Emacs 24.0.94.1 (x86_64-unknown-linux-gnu, GTK+ Version
2.24.9) of 2012-03-08.

Recipe:

emacs -q
eval:
(setq gnus-select-method '(nnnil "")
      mail-user-agent 'gnus-user-agent)
(add-hook 'message-mode-hook
      (lambda ()
        (whitespace-mode 1)))
C-x m # whitespace mode works - note the red marker on the space after
`Subject'
M-x gnus RET
C-x m # the marker is gone :(

Long story short, this bug is caused by gnus-message-citation-mode doing
some crazy font-lock stuff.  In particular that

(setq font-lock-set-defaults nil)
(font-lock-set-defaults)

in gnus-cite.el:1261 causes the trouble.

        Christopher