bug#16243: 24.3.50; shr-visit-file doesn't set the buffer's default-directory

[Lars Ingebrigtsen <larsi@gnus.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> To make relative URLs expand correctly, file://directory/file/is/in
>> should be passed in as the base directory.
>
> I'm not sure such a directory value will do what we want.  The value
> should be a local file name.  E.g., on Windows typing RET on a link
> will eventually call a function that needs to be able to produce an
> absolute file name by calling expand-file-name.

file:// specifies a local file.

>> `shr-visit-file' doesn't really visit a file.  It just does a rendering
>> based on it.  If `buffer-file-name' is set to the file, and you save
>> what you see, you destroy the .html file you see a rendering of.
>
> Then don't allow to save.

That's why `buffer-file-name' isn't set.  As it isn't in most special
mode buffers.

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