Bug 8686 Type Hierarchy: no methods shown
Smoke for build 20020129 - open type hierarchy on TestCase - switch to Subtype hierarchy - observe: you don't see any members of TestCase - lock the method view observe: now it is impossible to get the members back. You can click on any node in the upper class pane. You have to unlock the view
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
}
		fEnableMemberFilterAction.setChecked(on);
	}
	
	/**
	 * Called from ITypeHierarchyLifeCycleListener.
	 * Can be called from any thread
	 */
	private void doTypeHierarchyChanged(final TypeHierarchyLifeCycle typeHierarchy, final IType[] changedTypes) {
		Display display= getDisplay();
		if (display != null) {
			display.asyncExec(new Runnable() {
				public void run() {
					doTypeHierarchyChangedOnViewers(changedTypes);
				}
			});
		}
	}
	
	private void doTypeHierarchyChangedOnViewers(IType[] changedTypes) {
		if (fHierarchyLifeCycle.getHierarchy() == null || !fHierarchyLifeCycle.getHierarchy().exists()) {
			clearInput();
		} else {
			if (changedTypes == null) {
				
				try {
					fHierarchyLifeCycle.ensureRefreshedTypeHierarchy(fInputElement);
				} catch (JavaModelException e) {
					JavaPlugin.log(e.getStatus());
					clearInput();