If illegal arguments are supplied to the escape that sets scroll
region, xterm restores it to the full window; gnome-terminal
tries to honor them and gets one line region.

This happens with all releases between RH 6.2 and Wolverine
(latest beta at this moment).

To reproduce:

1. Set region -  echo -ne "\033[1;22r"

2. Scroll and observe, two bottom lines remain untouched. Good.

3. Set illegal region -  echo -ne "\033[0;0r"

4. Hit Enter several times. In xterm whole window will scroll.