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From: Jason Rumney <jasonrumney@gmail.com>
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Subject: Re: strange char in whitespace-display-mappings
Date: Sun, 22 Jul 2012 06:39:02 -0700 (PDT)
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On Sunday, 22 July 2012 06:34:15 UTC+8, Xah Lee  wrote:
> in whitespace-mode, there&#39;s this default value for whitespace-display-mappings :
> 
> ((space-mark 32 [183] [46])
>  (space-mark 160 [164] [95])
>  (space-mark 2208 [2212] [95])
>  (space-mark 2336 [2340] [95])
>  (space-mark 3616 [3620] [95])
>  (space-mark 3872 [3876] [95])
>  (newline-mark 10 [36 10])
>  (tab-mark 9 [187 9] [92 9])
> )
> 
> many of the code points are chars from Thai, Tibetan, Devanagari, and including invalid unicode code points. But they are not whitespaces. (i deciphered them here with glyph display http://ergoemacs.org/emacs/whitespace-mode.html )
> 
> anyone know what these are?

It looks like a bug. Probably the file has not been updated since the internal encoding for Emacs was changed from emacs-mule to utf-8-emacs.