Marks the currently rendered data (if any) as invalid, and queues
a redraw of the widget.
This ensures that the [signal@Gtk.GLArea::render] signal
is emitted during the draw.
This is only needed when [method@Gtk.GLArea.set_auto_render] has
been called with a %FALSE value. The default behaviour is to
emit [signal@Gtk.GLArea::render] on each draw.
Marks the currently rendered data (if any) as invalid, and queues a redraw of the widget.
This ensures that the [signal@Gtk.GLArea::render] signal is emitted during the draw.
This is only needed when [method@Gtk.GLArea.set_auto_render] has been called with a %FALSE value. The default behaviour is to emit [signal@Gtk.GLArea::render] on each draw.