bug#65685: 29.1; Inconsistent behavior of quoted file name "/:~" across platforms

[Michael Albinus]

Eli Zaretskii <eliz@gnu.org> writes:

Hi Eli,

> The added test fails on MS-Windows:
>
>   Test files-tests-file-name-non-special-expand-file-name-tilde condition:
>       (ert-test-failed
>        ((should
>        (equal
>         (expand-file-name nospecial)
>         (expand-file-name ...)))
>       :form
>       (equal "/:c:/Documents and Settings/Zaretzky/Local 
> Settings/Temp/files-testsvIKNPk/files-testse2cUFY" "c:/Documents and 
> Settings/Zaretzky/Local Settings/Temp/files-testsvIKNPk/files-testse2cUFY")
>       :value nil :explanation
>       (arrays-of-different-length 92 90 "/:c:/Documents and 
> Settings/Zaretzky/Local Settings/Temp/files-testsvIKNPk/files-testse2cUFY" 
> "c:/Documents and Settings/Zaretzky/Local 
> Settings/Temp/files-testsvIKNPk/files-testse2cUFY" first-mismatch-at 0)))
>
> I tried to understand the idea of the change, or even the actual root
> cause of the problem, but couldn't find that in the discussion or the
> code.  It doesn't help that file-name-non-special has no doc string
> and no documentation I could find about what it's supposed to do.
>
> Let's please discuss this now, because I tend just to revert the
> change on the emacs-29 branch, as it's too late there for untested
> ideas for obscure problems.

Please give me a day to check the situation on MS Windows. I don't
believe the change would hurt Emacs 29 in any way, handling "/:~"
doesn't happen in real life I believe. It is just a preparation for a
planned change in Eshell.

I know, "Famous last words" and alike ...

Best regards, Michael.