bug#17489: 24.3; Major mode spec in .dir-locals.el breaks dired

[Lars Ingebrigtsen]

Glenn Morris <rgm@gnu.org> writes:

> It's useful for dir-locals to apply to some buffers not visiting files.
> It's not just dired, it's some VC buffers as well, etc, IIRC.
>
> I believe this issue reduces to a duplicate of
>
> http://debbugs.gnu.org/13685

So I've now merged them.  (I think it would make sense to implement
something like what Glenn suggested there.)

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