Bug 189490 [CommonNavigator] Go To->Resource won't enable
I0524 1. Open the Project Explorer in the Resource perspective 2. Create a vanilla project P 3. Create a folder F 4. Create a file resource R Open the Navigate->Go To file. "Resource..." will remain disabled.
bundles/org.eclipse.ui.navigator.resources/src/org/eclipse/ui/internal/navigator/workingsets/WorkingSetsContentProvider.java
/* (non-Javadoc)
	 * @see org.eclipse.ui.navigator.IMementoAware#saveState(org.eclipse.ui.IMemento)
	 */
	public void saveState(IMemento aMemento) { 
		
	}
	public Object[] getChildren(Object parentElement) {
		if (parentElement instanceof IWorkingSet) {
			IWorkingSet workingSet = (IWorkingSet) parentElement;
			if (workingSet.isAggregateWorkingSet()) {
				switch (rootMode) {
					case WORKING_SETS :
						return ((AggregateWorkingSet) workingSet).getComponents();
					case PROJECTS :
						return workingSet.getElements();
				}
			}
			return workingSet.getElements();
		}
		return NO_CHILDREN;
	}
	public Object getParent(Object element) {
		if (helper != null)
			return helper.getParent(element);
		return null;
	}
	public boolean hasChildren(Object element) {
		return true;
	}
	public Object[] getElements(Object inputElement) {