Comment 13 for bug 1517597

I think the emulator is correct, albeit weird. Qemu provides a tablet virtual device (so you don't get two mouse pointers and can enter/leave the VM window freely), and it works well with Ubuntu and Windows. And it sounds like it worked well with Mir till recently.

The solution is not to modify the emulator, because the emulator is correctly designed to emulate a tablet. Much like that of a stylus-based tablet where the mouse cursor does follow your hovers if you're close enough, or you can jump to a new location. This is a mature established feature of Qemu that's been there for many years. So let's just fix Mir/libinput.