@Override
    public void setInputListener(RawInputListener listener) {
        this.listener = listener;
        if (listener != null && initialized) {
            sendFirstMouseEvent();
        }
    }
Send the input listener a special mouse-motion event with zero deltas in
order to initialize the listener's cursor position.
jme3-lwjgl3/src/main/java/com/jme3/input/lwjgl/GlfwMouseInput.java