bug#56712: 29.0.50; x-dnd-tests-do-direct-save fails on Cygwin

[Ken Brown <kbrown@cornell.edu>]

On 7/24/2022 9:02 PM, Po Lu wrote:
> Ken Brown <kbrown@cornell.edu> writes:
> 
>> On 7/24/2022 9:33 AM, Po Lu wrote:
>>> Now done.  Ken, could you please re-run the test and show the detailed
>>> error that is signalled?
>>
>> Thanks.  The error is now clear:
>>
>> Test x-dnd-tests-do-direct-save condition:
>>      (file-missing "Opening output file" "No such file or directory"
>>      "//tmp/x-dnd-testvZQUCZ/x-dnd-test-targetKiqqPT")
>>
>> According to POSIX, the meaning of exactly 2 slashes at the beginning
>> of a path name is system dependent.  On Cygwin it's interpreted as a
>> UNC path.  That explains the error, but I don't immediately see where
>> the extra slash comes from.  (There are plenty of references to UNC
>> paths and to "file://" and "file:///" in dnd.el, so maybe there's some
>> code in there that incorrectly assumes that MS-Windows is the only
>> platform on which exactly 2 initial slashes has a special meaning.)
>>
>> Ken
> 
> Unless system-type can be windows-nt on Cygwin, I don't think that can
> happen.

No, system-type is cygwin on Cygwin.

>  I will look into this, thanks.

Thanks.

Ken