anchor.diff:    /// Returns a list of text boxes that enclose the given text range.
     List<TextBox> getBoxesForRange(int start, int end) native "Paragraph_getRectsForRange";
   
  -  List<int> _getPositionForOffset(Offset offset) native "Paragraph_getPositionForOffset";
  -
     /// Returns the text position closest to the given offset.
     TextPosition getPositionForOffset(Offset offset) {
       List<int> encoded = _getPositionForOffset(offset);
       return new TextPosition(offset: encoded[0], affinity: TextAffinity.values[encoded[1]]);
     }
  +  List<int> _getPositionForOffset(Offset offset) native "Paragraph_getPositionForOffset";
   }
   
   /// Builds a [Paragraph] containing text with the given styling information.
   class ParagraphBuilder extends NativeFieldWrapperClass2 {
  +  /// Creates a [ParagraphBuilder] object, which is used to create a
  +  /// [Paragraph].
  +  ParagraphBuilder() { _constructor(); }
     void _constructor() native "ParagraphBuilder_constructor";
  -  ParagraphBuilder() { _constructor(); }
   
     /// Applies the given style to the added text until [pop] is called.
     ///
  
positive.code: ///
  /// A paragraph retains the size and position of each glyph in the text and can
  /// be efficiently resized and painted.
  abstract class Paragraph extends NativeFieldWrapperClass2 {
    /// The minimum amount of horizontal space this paragraph of text is permitted to occupy.
    double get minWidth native "Paragraph_minWidth";
    void set minWidth(double value) native "Paragraph_setMinWidth";
  
negative.code:   /// Valid only after [layout] has been called.
    double get maxIntrinsicWidth native "Paragraph_maxIntrinsicWidth";
  
    /// The distance from the top of the paragraph to the alphabetic
    /// baseline of the first line, in logical pixels.
    double get alphabeticBaseline native "Paragraph_alphabeticBaseline";
  
    /// The distance from the top of the paragraph to the ideographic
     /// baseline of the first line, in logical pixels.
    double get ideographicBaseline native "Paragraph_ideographicBaseline";
  
    /// Computes the size and position of each glyph in the paragraph.
  