Bug 32384 Cannot open type hierarchy after a cancel
JUnit setup 1) open the type hierarchy on TestCase 2) press F4 on Object 3) cancel in progress bar 4) press F4 on Object again ->nothing happens
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
doTypeHierarchyChangedOnViewers(changedTypes);
					}
				}
			});
		}
	}
	
	protected void doTypeHierarchyChangedOnViewers(IType[] changedTypes) {
		if (fHierarchyLifeCycle.getHierarchy() == null || !fHierarchyLifeCycle.getHierarchy().exists()) {
			clearInput();
		} else {
			if (changedTypes == null) {
				
				try {
					fHierarchyLifeCycle.ensureRefreshedTypeHierarchy(fInputElement, getSite().getWorkbenchWindow());
				} catch (JavaModelException e) {
					JavaPlugin.log(e);
					clearInput();
					return;
				}
				fMethodsViewer.refresh();
				updateHierarchyViewer(false);
			} else {
				
				fMethodsViewer.refresh();
				if (getCurrentViewer().isMethodFiltering()) {
					if (changedTypes.length == 1) {
						getCurrentViewer().refresh(changedTypes[0]);
					} else {
						updateHierarchyViewer(false);