+ /* height metrics */
+ cairo_text_extents_t ext;
+ cairo_text_extents (cr, X_("AQRjpy"), &ext);
+ _text_height = ext.height;
+ _descender_height = ext.height + ext.y_bearing;
+
+ /* width of the whole thing */
+ if (_matrix->visible_columns()) {
+ _width = group_size (_matrix->visible_columns()) * grid_spacing ();
+ } else {
+ _width = 0;