anchor.diff:      if (children != null) {
         body.add(new Flexible(
           child: new SingleChildScrollView(
  -          padding: contentPadding ?? const EdgeInsetsDirectional.fromSTEB(0.0, 12.0, 0.0, 16.0),
  +          padding: contentPadding,
             child: new ListBody(children: children),
           )
         ));
  
positive.code: 
    /// Padding around the content.
    ///
    /// Uses material design default if none is supplied.
    final EdgeInsetsGeometry contentPadding;
  
    /// The (optional) set of actions that are displayed at the bottom of the
  
negative.code:   /// Creates a simple dialog.
    ///
    /// Typically used in conjunction with [showDialog].
    ///
    /// The [titlePadding] and [contentPadding] arguments must not be null.
    const SimpleDialog({
      Key key,
      this.title,
      this.titlePadding: const EdgeInsets.fromLTRB(24.0, 24.0, 24.0, 0.0),
      this.children,
      this.contentPadding: const EdgeInsets.fromLTRB(0.0, 12.0, 0.0, 16.0),
    }) : assert(titlePadding != null),
         assert(contentPadding != null),
         super(key: key);
  
    /// The (optional) title of the dialog is displayed in a large font at the top
    /// of the dialog.
  