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.
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.