Ido mode on Windows: please turn off cache

[Herbert Euler]

Ido-mode uses a cache for saving the content of recently visted
directories, through the variable `ido-dir-file-cache'.  While this is
not reliable on Windows.  I found that creating a file in a directory
does not change the modification time of the directory on Windows, so
that if a directory is visited recently, ido-mode cannot show the new
files created after that visit.

What about turn off cache for Windows?

Regards,
Guanpeng Xu

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