Bug 28269 type hierarchy makes work much slower even though it's invisible
20021210 i had a big type hierarchy open but put in the background - behind the package explorer i added 1 type to the workspace boom - tyhe whole thing froze for 2 minutes because the type hierarchy was doing a lot of work that i did not ask for and no busy cursor it makes it quite impossible to work if you have a type hierarchy open anywhere
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
private ArrayList fInputHistory;
	
	private IMemento fMemento;
	
	private TypeHierarchyLifeCycle fHierarchyLifeCycle;
	private ITypeHierarchyLifeCycleListener fTypeHierarchyLifeCycleListener;
	
	private IPropertyChangeListener fPropertyChangeListener;
		
	private MethodsViewer fMethodsViewer;
			
	private int fCurrentViewerIndex;
	private TypeHierarchyViewer[] fAllViewers;
	
	private SelectionProviderMediator fSelectionProviderMediator;
	private ISelectionChangedListener fSelectionChangedListener;
	
	private boolean fIsEnableMemberFilter;
	
	private SashForm fTypeMethodsSplitter;
	private PageBook fViewerbook;
	private PageBook fPagebook;
	
	private Label fNoHierarchyShownLabel;
	private Label fEmptyTypesViewer;
	
	private ViewForm fTypeViewerViewForm;
	private ViewForm fMethodViewerViewForm;