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From: robert.thorpe@antenova.com (Rob Thorpe)
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Subject: Re: comments are not highlighted
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Prem Mallappa <prem_mallappa@hotpop.com> wrote in message news:<pan.2003.09.16.02.53.46.977248@hotpop.com>...
> Hi 
> 
> i opened file /usr/src/kernel-source-2.xxx/drivers/net/eepro100.c
> 
> which has arround 150 lines of comments. at line 184 or so.. . Emacs stops
> changing the color (global-font-lock-mode) of comments after certain point
> ( 100 lines or so) after that it shows the comments as normal text and
> highlights the keywords such as "do" "for" etc.. 
> 
> One more thing i noticed i selected whole buffer and said "indent-region"
> Now everything is fine..
> Why emacs is unable to see the comments as *comments*
> I am running 21.3.1

Got no idea what causes that, but M-x lazy-lock-mode RET fixes it
Bug in jit lock?  I don't even know if its gauranteed to work in all situations.