Potential Bug

In options.api\src\org\netbeans\modules\options\CategoryModel.java, there is the following code:


Code:
        final void update(PropertyChangeListener l, boolean forceUpdate) {
            if ((!isUpdated && !forceUpdate) || (isUpdated && forceUpdate)) {// problem with this line?? Boils down to: if(isUpdated==forceUpdate)
                isUpdated = true;
                getComponent();
                create().update();
                if (l != null) {
                    create().addPropertyChangeListener(l);
                }
            }
        }




Wouldn't it make more sense to say if(isUpdated || forceUpdate) for this clause?

I'm noticed this while trying to hunt down this bug: https://netbeans.org/bugzilla/show_bug.cgi?id=262540  Can someone help me understand the logic here? 

Sincerely,
  Karl