[MERGE] Rename on Windows is able to change filename case. (#77740)

[Alexander Belchenko]

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Aaron Bentley пишет:
> Alexander Belchenko wrote:
>> Aaron Bentley ?8H5B:
>>> Alexander Belchenko wrote:
>>>> I'm also like to see the complete fix, but we need some way
>>>> to detect case-insensitivity first.
>>> I'm not sure that's true.  We could handle it this way:
>>> rename target -> tmp (success)
>>> rename src -> target (failure)
>>> rename tmp -> target (success)
>>> We would be subject to race conditions, but fancy_rename already is.
>> What about this variant for fancy_rename:
> 
> I like it.

Updated patch attached.

>> +        except (IOError, OSError), e:
>> +            # case insensitive filesystem may be?
>> +            if (not file_existed
>> +                or e.errno not in (None, errno.ENOENT, errno.ENOTDIR)):

> Why would we get ENOTDIR?

Still don't know. Maybe anybody else could shed light on this?
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