bug#25875: 26.0.50; Hang logging out of MS-Windows

[Eli Zaretskii]

> From: Richard Copley <rcopley@gmail.com>
> Date: Sat, 25 Feb 2017 22:02:17 +0000
> Cc: 25875@debbugs.gnu.org
> 
> A negative test result: from "emacs -Q", this recipe
> doesn't cause a hang:
> 
> ;; open an Ediff control panel frame
> M-x ediff-buffers RET *scratch* RET *Messages* RET
> ;; Restart the computer.
> ;; (Result: the computer restarts normally.)

Probably because the Ediff control frame is not the selected one.