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
public void selectionChanged(SelectionChangedEvent event) {
				doSelectionChanged(event);
			}
		};
		
	}
	/**
	 * Method doPropertyChange.
	 * @param event
	 */
	private void doPropertyChange(PropertyChangeEvent event) {
		if (fMethodsViewer != null) {
			if (PreferenceConstants.APPEARANCE_MEMBER_SORT_ORDER.equals(event.getProperty())) {
				fMethodsViewer.refresh();
			}
		}
	}
	
		
	/**
	 * Adds the entry if new. Inserted at the beginning of the history entries list.
	 */		
	private void addHistoryEntry(IJavaElement entry) {
		if (fInputHistory.contains(entry)) {
			fInputHistory.remove(entry);
		}
		fInputHistory.add(0, entry);
		fHistoryDropDownAction.setEnabled(true);
	}