Bug 110169 [Navigator] ResourceNavigator.initWorkingSetFilter should be protected visibility.
The above mentioned method seems mistakingly have an incorrect visibility. E.g. the method initResourceSorter is protected. I don't see why initResourceSorter is not protected.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/navigator/ResourceNavigator.java
setSorter(new ResourceSorter(sortType));
    }
    /**
     * Restores the working set filter from the persistence store.
     */
    void initWorkingSetFilter() {
        String workingSetName = settings.get(STORE_WORKING_SET);
        IWorkingSet workingSet = null;
        
        if (workingSetName != null && workingSetName.equals("") == false) { 
			IWorkingSetManager workingSetManager = getPlugin().getWorkbench()
					.getWorkingSetManager();
			workingSet = workingSetManager.getWorkingSet(workingSetName);
		} else if (PlatformUI
				.getPreferenceStore()
				.getBoolean(
						IWorkbenchPreferenceConstants.USE_WINDOW_WORKING_SET_BY_DEFAULT)) {
			
			workingSet = getSite().getPage().getAggregateWorkingSet();
		}
		if (workingSet != null) {
			
			
			
			workingSetFilter.setWorkingSet(workingSet);
			internalSetWorkingSet(workingSet);
		}
    }
    /**
	 * Returns whether the navigator selection automatically tracks the active