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/resources/actions/WorkingSetActionProvider.java
public void propertyChange(PropertyChangeEvent event) {
			String property = event.getProperty();
			Object newValue = event.getNewValue();
			Object oldValue = event.getOldValue();
			if (IWorkingSetManager.CHANGE_WORKING_SET_REMOVE.equals(property) && oldValue == workingSet) {
				setWorkingSet(null);
			} else if (IWorkingSetManager.CHANGE_WORKING_SET_NAME_CHANGE.equals(property) && newValue == workingSet) {
			} else if (IWorkingSetManager.CHANGE_WORKING_SET_CONTENT_CHANGE.equals(property) && newValue == workingSet) {
				if (workingSet.isAggregateWorkingSet() && workingSet.isEmpty()) {
					
					if (!emptyWorkingSet) {
						emptyWorkingSet = true;
						workingSetFilter.setWorkingSet(null);
					}
				} else {
					
					
					if (emptyWorkingSet) {
						emptyWorkingSet = false;
						workingSetFilter.setWorkingSet(workingSet);
					}
				}
				if (viewer != null) {
					viewer.refresh();
				}
			}
		}
		/**
		 * Begin listening to the correct source if not already listening.
		 */