Add a message tray feature that permits themes to add an icon in the top navigation bar that notifies the unread messages and permits read and navigation to the message itself.

We've been working on a message and notification tray that can be very interesting to replace the current popup message.

It needs very little code, as you can see:

https://github.com/projectestac/moodle-local_agora/tree/master/message_notifier

And some improvements can be done. The current version notifies only the messages configured as Popup Notification in the Messaging uers settings.

When there are messages, like in Facebook, appears a number on the message tray icon. And when you click on it, a list of message will be shown and an All message link (to go to messages). Additionaly, if you click on a message, a popup will be shown with its text: You can close or mark as read the message. It also have a link to the message page.

Please discuss the adding of this feature on the forums:
https://moodle.org/mod/forum/discuss.php?d=276934