bug#26911: 25.2; eshell "cd .." doesn't work correctly with TRAMP

[Paul Eggert]

On 8/28/20 3:48 AM, Eli Zaretskii wrote:
> That period after the colon following the drive letter shouldn't be
> there.  As you may imagine, many Emacs commands are now broken because
> of this.  This must be fixed ASAP.

I installed the attached patch to revert the recent expand-file-changes in the 
DOS_NT case, which should fix the problem you mentioned.

This part of fileio.c is hard to follow because of the #ifdef DOS_NT and #ifdef 
WINDOWSNT and #ifdef MSDOS and whatnot. How about if we move the 
MS-Windows-specific code to a different source file instead of having that 
forest of ifdefs in fileio.c? As things stand, it's hard to maintain the 
mainline GNU code, because the way everything's arranged the Microsoft-specific 
stuff significantly obfuscates everything else.

0001-Revert-recent-expand-file-name-changes-if-DOS_NT.patch
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