measure
Description:
Measures the text provided using the pango layout used by the GutterRendererText.
Parameters:
| this | |
| text | 
           the text to measure.  | 
      
| width | 
           location to store the width of the text in pixels, or null.  | 
      
| height | 
           location to store the height of the text in pixels, or null.  |