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
fHistoryDropDownAction.setEnabled(false);
		
		fToggleOrientationActions= new ToggleOrientationAction[] {
			new ToggleOrientationAction(this, VIEW_ORIENTATION_VERTICAL),
			new ToggleOrientationAction(this, VIEW_ORIENTATION_HORIZONTAL),
			new ToggleOrientationAction(this, VIEW_ORIENTATION_SINGLE)
		};
			
		fEnableMemberFilterAction= new EnableMemberFilterAction(this, false);
		fShowQualifiedTypeNamesAction= new ShowQualifiedTypeNamesAction(this, false);
		
		fFocusOnTypeAction= new FocusOnTypeAction(this);
		
		fPaneLabelProvider= new JavaUILabelProvider();
		
		fAddStubAction= new AddMethodStubAction();
		fFocusOnSelectionAction= new FocusOnSelectionAction(this);	
	
		fPartListener= new IPartListener() {
			public void partActivated(IWorkbenchPart part) {
				if (part instanceof IEditorPart)
					editorActivated((IEditorPart) part);
			}
			public void partBroughtToTop(IWorkbenchPart part) {}
			public void partClosed(IWorkbenchPart part) {}
			public void partDeactivated(IWorkbenchPart part) {}
			public void partOpened(IWorkbenchPart part) {}
		};
		
		fSelectionChangedListener= new ISelectionChangedListener() {