ActionGroup.getActionStateType

Queries the type of the state of the named action within action_group.

If the action is stateful then this function returns the #GVariantType of the state. All calls to [gio.action_group.ActionGroup.changeActionState] must give a #GVariant of this type and [gio.action_group.ActionGroup.getActionState] will return a #GVariant of the same type.

If the action is not stateful then this function will return null. In that case, [gio.action_group.ActionGroup.getActionState] will return null and you must not call [gio.action_group.ActionGroup.changeActionState].

The state type of a particular action will never change but it is possible for an action to be removed and for a new action to be added with the same name but a different state type.