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.
label of the button
an action name
a #GVariant to use as action's parameter, or 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.