private void sendFirstMouseEvent() {
        assert listener != null;

        int xDelta = 0;
        int yDelta = 0;
        int wheelDelta = 0;
        MouseMotionEvent evt = new MouseMotionEvent(mouseX, mouseY, xDelta, yDelta,
                mouseWheel, wheelDelta);
        evt.setTime(getInputTimeNanos());

        listener.onMouseMotionEvent(evt);
     }
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