Gtk.CellRenderer.prototype.render

function render(cr:cairo.Context, widget:Gtk.Widget, background_area:Gdk.Rectangle, cell_area:Gdk.Rectangle, flags:Gtk.CellRendererState):void {
    // Gjs wrapper for gtk_cell_renderer_render()
}

Invokes the virtual render function of the Gtk.CellRenderer. 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 Gtk.CellRenderer 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.