anchor.diff:    /// number of children because the builder is called only for those children
     /// that are actually visible.
     ///
  -  /// Providing a non-null [itemCount] improves the ability of the [GridView] to
  +  /// Providing a non-null `itemCount` improves the ability of the [GridView] to
     /// estimate the maximum scroll extent.
     ///
  -  /// [itemBuilder] will be called only with indices greater than or equal to
  -  /// zero and less than [itemCount].
  +  /// `itemBuilder` will be called only with indices greater than or equal to
  +  /// zero and less than `itemCount`.
     ///
     /// The [gridDelegate] argument must not be null.
     GridView.builder({
  
positive.code:   /// number of children because the builder is called only for those children
    /// that are actually visible.
    ///
    /// Providing a non-null [itemCount] improves the ability of the [ListView] to
    /// estimate the maximum scroll extent.
    ///
    /// [itemBuilder] will be called only with indices greater than or equal to
    /// zero and less than [itemCount].
    ListView.builder({
      Key key,
      Axis scrollDirection: Axis.vertical,
  
negative.code:   /// children because constructing the [List] requires doing work for every
    /// child that could possibly be displayed in the list view instead of just
    /// those children that are actually visible.
    ///
    /// It is usually more efficient to create children on demand using [new
    /// ListView.builder].
    ListView({
      Key key,
      Axis scrollDirection: Axis.vertical,
  