Description of problem:
In a screen session inside gnome-terminal, when one goes into
copy mode and scrolls up with the Up key, the cursor leaves a
black vertical trail behind it once the screen starts scrolling down.
It is undone by Down again fwiw.

Version-Release number of selected component (if applicable):
vte-0.11.6-1
gnome-terminal-2.2.1-3

How reproducible:
Every time

Steps to Reproduce:
1.Start gnome-terminal.
2.Run "screen" in it.
3.Press "Ctrl-a ["
4.Scroll screen buffer up with Up
    
Actual results:
Black vertical trail left behind cursor

Expected results:
No scrolling artefacts.

Additional info:
This didn't happen with the vte in Shrike.