GLArea.queueRender

Marks the currently rendered data (if any) as invalid, and queues a redraw of the widget.

This ensures that the [gtk.glarea.GLArea.render] signal is emitted during the draw.

This is only needed when [gtk.glarea.GLArea.setAutoRender] has been called with a false value. The default behaviour is to emit [gtk.glarea.GLArea.render] on each draw.