Queries the current state of action.
If the action is not stateful then NULL will be returned. If the
action is stateful then the type of the return value is the type
given by g_action_get_state_type().
The return value (if non-NULL) should be freed with
g_variant_unref() when it is no longer required.
Since 2.28
Queries the current state of action. If the action is not stateful then NULL will be returned. If the action is stateful then the type of the return value is the type given by g_action_get_state_type(). The return value (if non-NULL) should be freed with g_variant_unref() when it is no longer required. Since 2.28