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
public Object getAdapter(Class key) {
		if (key == IShowInSource.class) {
			return getShowInSource();
		}
		if (key == IShowInTargetList.class) {
			return new IShowInTargetList() {
				public String[] getShowInTargetIds() {
					return new String[] { JavaUI.ID_PACKAGES, IPageLayout.ID_RES_NAV  };
				}
			};
		}
		if (key == IContextProvider.class) {
			return JavaUIHelp.getHelpContextProvider(this, IJavaHelpContextIds.TYPE_HIERARCHY_VIEW);
		}
		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);