For example, it could be as simple as pressing the up arrow key to scroll through the CLI history (or ESC K for the 'set -o vi' crowd). A good percentage of the time when I'd do that, the command line wouldn't completely render, CTRL C and scrolling again usually cleared it up.
I also experienced the behavior a lot when in VI. Scroll or jump to a line and the text would end up being a combination of the previous page and the new location.
I experienced the issue using Nouveau and binary Nvidia drivers.
The following Bugzilla ticket provided a possible workaround. I've only just implemented the ENV variables, but after 1 day of use I have yet to experience the issue, where as before it was pretty consistent.
To globally apply the settings, add the following variables to end of /etc/gdm/Xsession
# Attempting to fix the Gnome terminal redraw issue: # https://bugzilla.redhat.com/show_bug.cgi?id=720605 export CLUTTER_DEBUG=disable-culling export CLUTTER_PAINT=disable-clipped-redraws:disable-culling
Reboot, log back in and hopefully the issue goes away :-)