 -- Class: <gtk-cell-renderer-spin>
     Derives from <gtk-cell-renderer-text>.

     This class defines the following slots:

     adjustment
          The adjustment that holds the value of the spinbutton.

     climb-rate
          The acceleration rate when you hold down a button

     digits
          The number of decimal places to display

 -- Function: gtk-cell-renderer-spin-new =>  (ret <gtk-cell-renderer>)
     Creates a new <gtk-cell-renderer-spin>.

     ret
          a new <gtk-cell-renderer-spin>

     Since 2.10