Bug 62716 Java Editor Text Hover prefs: Error Message stays unless row selected
200405180816 - Open Java > Editor > Hovers prefs page - Click or doubleclick checkbox in front of "Variable Values" to check -> Error message, is OK - Click again to uncheck => Error message persists. Only goes away after clicking into the table or selecting another row.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorHoverConfigurationBlock.java
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) {
			return false;
		}
		public void removeListener(ILabelProviderListener listener) {
		}
	}
	
	
	private class JavaEditorTextHoverDescriptorContentProvider implements IStructuredContentProvider {
		
		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
			
		}