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
linkToEditor(selection);
                        }
                    }
                }
            });
        }
    }
    /**
     * Handles a key press event from the viewer.
     * Delegates to the action group.
     * 
     * @param event the key event
     * @since 2.0
     */
    protected void handleKeyPressed(KeyEvent event) {
        getActionGroup().handleKeyPressed(event);
    }
    /**
     * Handles a key release in the viewer.  Does nothing by default.
     * 
     * @param event the key event
     * @since 2.0
     */
    protected void handleKeyReleased(KeyEvent event) {
    }
    /* (non-Javadoc)
     * Method declared on IViewPart.