Invokes the virtual render function of the #GtkCellRenderer. The three
passed-in rectangles are areas in @cr. Most renderers will draw within
@cell_area; the xalign, yalign, xpad, and ypad fields of the #GtkCellRenderer
should be honored with respect to @cell_area. @background_area includes the
blank space around the cell, and also the area containing the tree expander;
so the @background_area rectangles for all cells tile to cover the entire
@window.
Invokes the virtual render function of the #GtkCellRenderer. The three passed-in rectangles are areas in @cr. Most renderers will draw within @cell_area; the xalign, yalign, xpad, and ypad fields of the #GtkCellRenderer should be honored with respect to @cell_area. @background_area includes the blank space around the cell, and also the area containing the tree expander; so the @background_area rectangles for all cells tile to cover the entire @window.