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
ISelectionChangedListener {
    private CallHierarchyViewSiteAdapter fViewSiteAdapter;
    private CallHierarchyViewAdapter fViewAdapter;
    private static final String DIALOGSTORE_VIEWORIENTATION = "CallHierarchyViewPart.orientation"; 
    private static final String DIALOGSTORE_CALL_MODE = "CallHierarchyViewPart.call_mode"; 
    private static final String TAG_ORIENTATION = "orientation"; 
    private static final String TAG_CALL_MODE = "call_mode"; 
    private static final String TAG_IMPLEMENTORS_MODE = "implementors_mode"; 
    private static final String TAG_RATIO = "ratio"; 
    static final int VIEW_ORIENTATION_VERTICAL = 0;
    static final int VIEW_ORIENTATION_HORIZONTAL = 1;
    static final int VIEW_ORIENTATION_SINGLE = 2;
    static final int CALL_MODE_CALLERS = 0;
    static final int CALL_MODE_CALLEES = 1;