Wrong position when aligning screens

[jheidbrink]

I have a 1440 pixels high external display. When I move my internal display below the external one, wdisplays has a snap function that I suppose should help to perfectly align the two displays. My 1440 pixels high display has a DPI scale of 1.1, so that should make the y position of the lower display 1309.0909 pixels. However, it snaps at a position of 1307 pixels. I'm using Sway, and the result of this alignment is that I cannot use Sway's movement keys to switch between displays. When manually setting the y position to 1309, switching works fine, and I can also still use the mouse to move the cursor from one display to the next.

[alex-courtis]

way-displays had a similar issue. Solution was to ensure that the displays were lined up exactly on logical size units.

There were isses with rounding vs truncating.

See alex-courtis/way-displays#138 for description and alex-courtis/way-displays#145 for fix