Sets the parameter for action invocations.
This is a convenience function that calls [ctor@GLib.Variant.new] for format_string
and uses the result to call [
method@Toast.set_action_target_value].
If you are setting a string-valued target and want to set the action name at the same time, you can use [ method@Toast.set_detailed_action_name].
this |
a toast |
format_string |
a variant format string |
... |
arguments appropriate for |