> From: Fabrice Popineau <fabrice.popineau@gmail.com>
> Date: Wed, 22 Jan 2014 08:32:31 +0100
>
> The current Emacs trunk does not seem to honour display resolution change
> under Windows.
> There is one case where it is annoying: when the frame is fullsized.
> I have a laptop. I run `emacs -Q' , then `M-x toggle-frame-fullscreen'.
> Next I connect an external display with a higher resolution.
> The frame displays undecorated, but with a size of the previous screen
> resolution.
> I need to call `M-x toggle-frame-fullscreen' twice to get back a fullsized
> frame.
>
> I think that for handling at least this case, the following patch could be
> applied:

No comments, so I applied your patch.  Thanks.