Re: Bug in function x_calc_absolute_positionin xterm.c and w32term.c

[Fran Litterio <flitterio@gmail.com>]

I wrote:

> Using the latest sources, I see the following behavior on a machine
> with two 1920x1080 monitors arranged side-by-side:
> 
>   $ runemacs.exe -Q
...
>   (setq f (make-frame '((left . -1))))
>   #<frame emacs <at> IZSYSTEM023 015257f0>
>   (frame-parameter f 'left)
>   3155
> 
> The left offset of the new frame appears to be 1920 pixels too far
> to the right.  Evaluating the following form positions the frame to
> its expected location (abutting the right edge of the rightmost 
> monitor):
> 
>   (set-frame-position f (- 3155 1920) 0)

I've learned that this only happen when the 2nd monitor is positioned
to the left of the primary Windows monitor, resulting in negative
X offsets for frames on the 2nd monitor.  If I configure Windows to
position the 2nd monitor to the right of the primary monitor, all
X offsets are positive, and the first form above works as expected
(the new frame abuts the far right edge of the combined monitors).

I still believe the fix should be made in x_calc_absolute_position, but 
it must now take into consideration whether X offset 0 is within the 
multi-monitor display or at the far left edge.

I still hope to create a patch to fix this problem.
--
Fran Litterio
flitterio@gmail.com