Bug 32384 Cannot open type hierarchy after a cancel
JUnit setup 1) open the type hierarchy on TestCase 2) press F4 on Object 3) cancel in progress bar 4) press F4 on Object again ->nothing happens
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
return super.getAdapter(key);
	}
	
	private Control createTypeViewerControl(Composite parent) {
		fViewerbook= new PageBook(parent, SWT.NULL);
				
		KeyListener keyListener= createKeyListener();
						
		
		TypeHierarchyViewer superTypesViewer= new SuperTypeHierarchyViewer(fViewerbook, fHierarchyLifeCycle, this);
		initializeTypesViewer(superTypesViewer, keyListener, IContextMenuConstants.TARGET_ID_SUPERTYPES_VIEW);
		
		TypeHierarchyViewer subTypesViewer= new SubTypeHierarchyViewer(fViewerbook, fHierarchyLifeCycle, this);
		initializeTypesViewer(subTypesViewer, keyListener, IContextMenuConstants.TARGET_ID_SUBTYPES_VIEW);
		
		TypeHierarchyViewer vajViewer= new TraditionalHierarchyViewer(fViewerbook, fHierarchyLifeCycle, this);
		initializeTypesViewer(vajViewer, keyListener, IContextMenuConstants.TARGET_ID_HIERARCHY_VIEW);
		fAllViewers= new TypeHierarchyViewer[3];
		fAllViewers[VIEW_ID_SUPER]= superTypesViewer;
		fAllViewers[VIEW_ID_SUB]= subTypesViewer;
		fAllViewers[VIEW_ID_TYPE]= vajViewer;
		
		int currViewerIndex;
		try {
			currViewerIndex= fDialogSettings.getInt(DIALOGSTORE_HIERARCHYVIEW);
			if (currViewerIndex < 0 || currViewerIndex > 2) {
				currViewerIndex= VIEW_ID_TYPE;
			}
		} catch (NumberFormatException e) {
			currViewerIndex= VIEW_ID_TYPE;