bug#34346: 26.1; Big hang when opening text (racket) files with .art extension (image-mode)

[Eli Zaretskii]

> From: Pierre Neidhardt <mail@ambrevar.xyz>
> Cc: Eli Zaretskii <eliz@gnu.org>, 34346@debbugs.gnu.org
> Date: Wed, 06 Feb 2019 21:53:26 +0100
> 
> If the extension does not match Emacs' expectations, it should not freeze it 
> for
> a minute and almost halt the computer to a grind.
> 
> In other words, Emacs should fail gracefully when image-mode does not make 
> sense
> with the actual content of the file.
> 
> Does that make sense?

I does, I just think that your desire is generally unattainable, even
though in the specific case in point perhaps we should simply drop
support for .art extensions.