Bug 100429 dropping on type hierarchy method viewer updates input
20050616-0010 - Open a element in the type hierarchy - enable 'Show all inherited methods' - select a method from Object, drop it to itself - Hierarchy of Object is built Drop to itself can happen easely when clicking quickly on entries. Dropping on the method viewer should be disabled (and I think it was before)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
IStatusLineManager slManager= getViewSite().getActionBars().getStatusLineManager();
		fSelectionProviderMediator.addSelectionChangedListener(new StatusBarUpdater(slManager));
		
		getSite().setSelectionProvider(fSelectionProviderMediator);
		getSite().getPage().addPartListener(fPartListener);
		
		
		IJavaElement input= null; 
		if (fMemento != null) {
			restoreState(fMemento, input);
		} else if (input != null) {
			setInputElement(input);
		} else {
			setViewerVisibility(false);
		}
		PlatformUI.getWorkbench().getHelpSystem().setHelp(fPagebook, IJavaHelpContextIds.TYPE_HIERARCHY_VIEW);
		
		
		fActionGroups= new CompositeActionGroup(new ActionGroup[] {
				new NewWizardsActionGroup(this.getSite()),
				new OpenEditorActionGroup(this), 
				new OpenViewActionGroup(this), 
				new CCPActionGroup(this), 
				new GenerateActionGroup(this),
				new RefactorActionGroup(this),
				new JavaSearchActionGroup(this)
		});
		
		fActionGroups.fillActionBars(actionBars);
		fSelectAllAction= new SelectAllAction(fMethodsViewer);