Bug 74171 [preferences] Pref page; Restore defaults does not reset error status correctly
Version: 3.1.0 Build id: 200409140800 @@@@ Window/Preferences/Java/Editor/Hovers Select "Variable Values" Enter "Ctrl" as its hover. Delete "Ctrl" in text area so that it is empty. Click on "Restore Defaults". Observe the error will still be there.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorHoverConfigurationBlock.java
public Image getColumnImage(Object element, int columnIndex) {
			return null;
		}
		
		public String getColumnText(Object element, int columnIndex) {
			switch (columnIndex) {
			case ENABLED_PROP:
				return ((JavaEditorTextHoverDescriptor)element).getLabel();
			case MODIFIER_PROP:
				TableItem item= (TableItem)fHoverTableViewer.testFindItem(element);
				int index= fHoverTable.indexOf(item);
				return fHoverConfigs[index].fModifierString;
			default:
				break;
			}
			
			return null;
		}
		public void addListener(ILabelProviderListener listener) {
		}
		
		public void dispose() {
		}
		public boolean isLabelProperty(Object element, String property) {