Emulator unresponsive to mouse events after saving vm

[FluffLescure]

Steps to reproduce:

1. Build Docker image from repo with qemu-rm2fb as target
2. Run inside a container with port 22 open: $ docker run -it --volume /tmp/.X11-unix:/tmp/.X11-unix --volume $HOME/.Xauthority:/root/.Xauthority --env DISPLAY --hostname "$(hostnamectl hostname)" --publish 22:22 -it rm-docker
3. After xochitl initialisation, run /opt/bin/save_vm.sh in container exec.
4. Restart Docker container.

When the container first starts and everything finishes loading, it's possible to interact with the emulator as if using a pen. After having saved a snapchot of the qemu vm, and restarted the container, the emulator is back up but it is no longer possible to interact with it using the mouse.