Notification.addButtonWithTarget
void addButtonWithTarget(string label, string action, glib.variant.Variant target = null)Adds a button to notification that activates action when clicked. action must be an application-wide action (it must start with "app.").
If target is non-null, action will be activated with target as its parameter.
Parameters
label | label of the button |
action | an action name |
target | a #GVariant to use as action's parameter, or null |