Description of problem:
The MATE notifications is appearing above the screensavers, but the notifications may contain mail, chat, personal info, etc. and it may allow someone who is in the same room check the user's mails, IRC chats, and more.
Version-Release number of selected component (if applicable):
Open IRC chat (Hexchat), and set settings to make the private messages, chat messages, and highlighted messages appear in the MATE notifications or set up your mail client to put notifications when you have got a new mail. Open Xscreensaver, Click on the screensaver and let it preview. Look at the top right corner, the notification is appearing.
Steps to Reproduce:
1. Open IRC client (hexchat) and set the settings to make the private, chat, and highlighted messages appear on the MATE notifications or set up your mail client to put notifications when you got a new mail.
2. Open Xscreensaver or Screensaver settings in MATE. System -> Look and Feel -> Screensaver.
3. Let it preview by clicking the preview button.
The notifications appear on the top right corner above the screensaver layer, making MATE notifications the most top layer ever.
The notifications should be below the xscreensaver layer so the notifications would not show up.
I don't use MATE at all, however are there X composite manager present on MATE session?
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