Bug 36981 call hierarchy: Search scope should be persisted
Search scope should be persisted when the platform shuts down or when the view is closed and reopened.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewPart.java
static final int IMPLEMENTORS_ENABLED = 0;
    static final int IMPLEMENTORS_DISABLED = 1;
    static final String GROUP_SEARCH_SCOPE = "MENU_SEARCH_SCOPE"; 
	static final String ID_CALL_HIERARCHY = "org.eclipse.jdt.callhierarchy.view"; 
	private static final String GROUP_FOCUS = "group.focus"; 
    private static final int PAGE_EMPTY = 0;
    private static final int PAGE_VIEWER = 1;
    private Label fNoHierarchyShownLabel;
    private PageBook fPagebook;
    private IDialogSettings fDialogSettings;
    private int fCurrentOrientation;
    private int fCurrentCallMode;
    private int fCurrentImplementorsMode;
    private MethodWrapper fCalleeRoot;
    private MethodWrapper fCallerRoot;
    private IMemento fMemento;
    private IMethod fShownMethod;
    private SelectionProviderMediator fSelectionProviderMediator;
    private List fMethodHistory;
    private TableViewer fLocationViewer;
    private Menu fLocationContextMenu;
    private SashForm fHierarchyLocationSplitter;
    private Clipboard fClipboard;
    private SearchScopeActionGroup fSearchScopeActions;
    private ToggleOrientationAction[] fToggleOrientationActions;
    private ToggleCallModeAction[] fToggleCallModeActions;
    private ToggleImplementorsAction[] fToggleImplementorsActions;
    private CallHierarchyFiltersActionGroup fFiltersActionGroup;
    private HistoryDropDownAction fHistoryDropDownAction;
    private RefreshAction fRefreshAction;