Gtk.Widget.prototype.set_redraw_on_allocate

function set_redraw_on_allocate(redraw_on_allocate:Boolean):void {
    // Gjs wrapper for gtk_widget_set_redraw_on_allocate()
}

Sets whether the entire widget is queued for drawing when its size allocation changes. By default, this setting is true and the entire widget is redrawn on every size change. If your widget leaves the upper left unchanged when made bigger, turning this setting off will improve performance.

Note that for %NO_WINDOW widgets setting this flag to false turns off all allocation on resizing: the widget will not even redraw if its position changes; this is to allow containers that don't draw anything to avoid excess invalidations. If you set this flag on a %NO_WINDOW widget that <emphasis>does</emphasis> draw on widget->window, you are responsible for invalidating both the old and new allocation of the widget when the widget is moved and responsible for invalidating regions newly when the widget increases size.