[ Signal ( action = true , detailed = true , no_hooks = true , no_recurse = true , run = "first" ) ]
public signal void changed ()
This signal is to be used in place of the standard GLib.Object.notify signal.
This signal only emits after a property's value was verified.
Note that in the case where a property was set to an invalid value, (and thus, sanitized to a valid value), the GLib.Object.notify signal will emit twice: once with the invalid value and once with the sanitized value.