just FYI: Ash allow a user to snap window by blocking mouse warp at the edge
of the display in multi display environment, so you'll need something equivalent to pointer barrier.

And unified desktop mode will map each display to offline buffer which will have different pixel size than physical pixels. So the way to map displays' edge should be flexible.

Migrating Proj-Mustash-Mus to components Internals>Services>WindowService and Internals>Services>Ash

This is no longer applicable.