anchor.diff:    /// Move the cursor backward by one character.
     ///
     /// This is for example used by the cursor control in text fields.
  -  static const SemanticsAction moveCursorBackardByCharacter = const SemanticsAction._(_kMoveCursorBackwardByCharacter);
  +  static const SemanticsAction moveCursorBackwardByCharacter = const SemanticsAction._(_kMoveCursorBackwardByCharacter);
   
     /// The possible semantics actions.
     ///
  
positive.code:     _kDecreaseIndex: decrease,
      _kShowOnScreen: showOnScreen,
      _kMoveCursorForwardByCharacter: moveCursorForwardByCharacter,
      _kMoveCursorBackwardByCharacter: moveCursorBackardByCharacter,
    };
  
    @override
  
negative.code:       case _kMoveCursorForwardByCharacter:
          return 'SemanticsAction.moveCursorForwardByCharacter';
        case _kMoveCursorBackwardByCharacter:
          return 'SemanticsAction.moveCursorBackwardByCharacter';
      }
      return null;
    }
  