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
2.40
See Implementation
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.