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

[Aaron Bentley]

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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.

Aaron
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