Bug 189490 [CommonNavigator] Go To->Resource won't enable
I0524 1. Open the Project Explorer in the Resource perspective 2. Create a vanilla project P 3. Create a folder F 4. Create a file resource R Open the Navigate->Go To file. "Resource..." will remain disabled.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
NavigatorPlugin.logError(0,
								"Could not restore state for Common Navigator content extension" 
										+ element.getId(), exception);
					}
				};
				runnables.add(runnable);
			}
			for (Iterator iterator = runnables.iterator(); iterator.hasNext();) {
				ISafeRunnable runnable = (ISafeRunnable) iterator.next();
				SafeRunner.run(runnable);
			}
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.internal.navigator.INavigatorContentService#saveState(
	 * org.eclipse.ui.IMemento)
	 */
	public void saveState(IMemento aMemento) {
		synchronized (this) {
			for (Iterator extensionItr = getExtensions().iterator(); extensionItr
					.hasNext();) {
				NavigatorContentExtension element = (NavigatorContentExtension) extensionItr
						.next();
				element.saveState(aMemento);
			}
		}
	}