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
if (workingSet.isAggregateWorkingSet()) {
				AggregateWorkingSet aggregateSet = (AggregateWorkingSet) workingSet;
				IWorkingSet[] components = aggregateSet.getComponents();
				for (int componentIndex = 0; componentIndex < components.length; componentIndex++) {
					IAdaptable[] elements = components[componentIndex].getElements();
					for (int elementsIndex = 0; elementsIndex < elements.length; elementsIndex++) {
						parents.put(elements[elementsIndex], components[componentIndex]);
					}
					parents.put(components[componentIndex], aggregateSet);
				}
			} else {
				IAdaptable[] elements = workingSet.getElements();
				for (int elementsIndex = 0; elementsIndex < elements.length; elementsIndex++) {
					parents.put(elements[elementsIndex], workingSet);
				}
			}
		}
		/**
		 * 
		 * @param element
		 *            An element from the viewer
		 * @return The parent associated with the element, if any.
		 */
		public Object getParent(Object element) {
			return parents.get(element);
		}
	}
	
}