Notification mails is not always sent but just if the build state changes

Currently with <alwaysSend> set to false, notification mails are sent only if the build state changes or if the state is ERROR or FAILURE and the notifier has been configured with error/failure.
This means that for a build in state SUCCESS, notification mails are not sent every time a build is run.

Indeed the expected behavior should be that notification mails are sent every time the build state matches the one configured per notifier. If a notifier is configured with "Send on Success" it wants to receive an email every time the project is built with success.