Re: [Emacs-diffs] emacs-26 7a8f22b: * test/lisp/url/url-file-tests.el (url-file): Use file:///, not file://.

[Juanma Barranquero]

The standard is not defined diferently for Posix and non-Posix
filenames. It says that the URI is file://[hostname]/path.

Some interpret it as if that means file://[hostname] + "/path", but
that is incorrect, or file://C:/my/path would be correct for a
Windows-style path (it is not).

It is defined so, for a //hostname/path, you extract hostname and path
(without the slashes) and put them in the corresponding slots of the
URI. For a /path, you extract the path, and put it into its slot (and
the hostname slot is empty).

Evidently, most implementations just use file:// and concatenate the
Posix filename, and it just works. That it breaks with Windows-style
paths shows that something isn't really right.

But anyway, it's a moot point. If you want to fix the test for Cygwin,
please do.