setDefaultActionAndTarget
Sets the default action of @notification to @action. This action is activated when the notification is clicked on. It must be an application-wide action (start with "app.").
If @target is non-null, @action will be activated with @target as its parameter.
When no default action is set, the application that the notification was sent on is activated.
Since
2.40
Parameters
action
an action name
target
a #GVariant to use as @action's parameter, or null