position of the action to query
return location for the type where the action was defined
return location for the action name
return location for the parameter type
return location for the property name
%TRUE if the action was found, %FALSE if @index_ is out of range
Queries the actions that have been installed for a widget class using [method@Gtk.WidgetClass.install_action] during class initialization.
Note that this function will also return actions defined by parent classes. You can identify those by looking at @owner.