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/navigator/CommonViewer.java
}
			} else {
				super.update(element, properties);
			}
		} else {
			super.update(element, properties);
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		return contentService.toString() + " Viewer"; 
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.AbstractTreeViewer#internalRefresh(java.lang.Object,
	 *      boolean)
	 */
	protected void internalRefresh(Object element, boolean updateLabels) {
		if (element == null && getRoot() == null) {
			return;
		}
		super.internalRefresh(element, updateLabels);
	}
}