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
clearInput();
		} else {
			if (changedTypes == null) {
				
				try {
					fHierarchyLifeCycle.ensureRefreshedTypeHierarchy(fInputElement, new BusyIndicatorRunnableContext());
				} catch (JavaModelException e) {
					JavaPlugin.log(e.getStatus());
					clearInput();
					return;
				}
				fMethodsViewer.refresh();
				updateHierarchyViewer();
			} else {
				
				fMethodsViewer.refresh();
				if (getCurrentViewer().isMethodFiltering()) {
					if (changedTypes.length == 1) {
						getCurrentViewer().refresh(changedTypes[0]);
					} else {
						updateHierarchyViewer();
					}
				} else {
					getCurrentViewer().update(changedTypes, new String[] { IBasicPropertyConstants.P_TEXT, IBasicPropertyConstants.P_IMAGE } );
				}
			}
		}
	}