Sets an error on the area which will be shown instead of the GL rendering.
This is useful in the [signal@Gtk.GLArea::create-context] signal if GL context creation fails.
a new GError, or %NULL to unset the error
See Implementation
Sets an error on the area which will be shown instead of the GL rendering.
This is useful in the [signal@Gtk.GLArea::create-context] signal if GL context creation fails.