alex-courtis
commented
3 weeks ago 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 https://github.com/alex-courtis/way-displays/issues/138 for description and https://github.com/alex-courtis/way-displays/pull/145 for fix
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.