bug#48202: 27.2; wrong frame position

[martin rudalics]

> When evaluating (set-frame-position nil 0 0), emacs frame moves to
> top-left of the screen, but there is a gap between the left edge of the
> screen and the emacs frame.
> The displayed position of 'emacs -g +0+0' is same as the above.
>
> The attached image is the result of the commands below.
>      runemacs -Q -D -T emacs --geometry +0+0
>      runemacs -Q -D -T emacs --geometry -0+0
>      runemacs -Q -D -T emacs --geometry +0-0
>      runemacs -Q -D -T emacs --geometry -0-0
>
>
>
>
>
> In GNU Emacs 27.2 (build 1, x86_64-w64-mingw32)
>   of 2021-03-26 built on CIRROCUMULUS
> Repository revision: deef5efafb70f4b171265b896505b92b6eef24e6
> Repository branch: HEAD
> Windowing system distributor 'Microsoft Corp.', version 10.0.19042
> System Description: Microsoft Windows 10 Pro (v10.0.2009.19042.964)

I suppose it's those invisible borders which leave an 8 or so pixels
wide gap.  It's highly annoying, especially when you want to display two
frames side-by-side and yet another reason not to use Windows 10.  IIRC
the Autohotkey people had some sort of fix for it but maybe I
misremember.  GNOME shell has a similar problem BTW.

martin