Updates an array of accessible states.
This function should be called by `GtkWidget` types whenever an accessible state change must be communicated to assistive technologies.
This function is meant to be used by language bindings.
| this |
a `GtkAccessible` |
| states |
an array of `GtkAccessibleState` |
| values |
an array of `GValues`, one for each state |
| n_states |
the number of accessible states to set |