Marks the currently rendered data (if any) as invalid, and queues a redraw of the widget.
This ensures that the [[email protected]:GtkGLArea:render
] signal is emitted during the draw.
This is only needed when [[email protected]_auto_render] has been called with a false value. The
default behaviour is to emit [[email protected]:GtkGLArea:render
] on each draw.
this |
a `GtkGLArea` |