Description of problem:
when resuming from suspend, the desktop with all its contents before suspending are visible for a short moment before the screen goes blank and one is able to enter his/her password to the session lock window.
this poses a slight security risk as there is enough time to read parts of the content.
Identical behavior to this:
X.Org X Server 1.18.4
<?xml version="1.0" encoding="UTF-8"?>
<distributor>FreeBSD GNOME Project</distributor>
Please re-open if this is still an issue.