default Point convertScreenPointToParent(Point point) {
        return isRoot() ? point : getParent().convertPointFromScreen(point);
    }
Converts a screen space point to the coordinate space of this node's parent.
<p>
This method assists in converting points from screen space in situations where this
node may be the root node, in which case getParent() is not available, and therefore,
you cannot simply do:

<pre>
 this.getParent().convertPointToScreen(p)
</pre>

@param point The point to convert, in screen space
@return The converted point in this node's parent's coordinate system
core/src/main/java/mrtjp/projectred/redui/RedUINode.java