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
fCurrentViewerIndex= -1;
		setView(currViewerIndex);
				
		return fViewerbook;
	}
	
	private KeyListener createKeyListener() {
		return new KeyAdapter() {
			public void keyReleased(KeyEvent event) {
				if (event.stateMask == 0) {
					if (event.keyCode == SWT.F5) {
						updateHierarchyViewer();
						return;
					} else if (event.character == SWT.DEL){
						if (fCCPActionGroup.getDeleteAction().isEnabled())
							fCCPActionGroup.getDeleteAction().run();
						return;	
					}
 				}
				viewPartKeyShortcuts(event);					
			}
		};		
	}
	
	private void initializeTypesViewer(final TypeHierarchyViewer typesViewer, KeyListener keyListener, String cotextHelpId) {
		typesViewer.getControl().setVisible(false);
		typesViewer.getControl().addKeyListener(keyListener);
		typesViewer.initContextMenu(new IMenuListener() {
			public void menuAboutToShow(IMenuManager menu) {