Description of problem:
If I want to chat using the textbased chat client irssi at a GNOME
terminal having the default setting TERM=xterm, I get missing, 
double or hopping lines inside the terminal after some time. It's 
really strange and very hard to describe. If I start irssi using 
TERM=linux, I don't have that problem. 

So I guess the problem is either ncurses (where I assigned it to) 
and/or GNOME terminal related. The problem came up with Fedora Core 
3 the first time.

Version-Release number of selected component (if applicable):
ncurses-5.4-13

How reproducible:
Most of the time, see below.

Steps to Reproduce:
1. Install irssi (a textbased chat client)
2. Start it (using the default TERM=xterm at a GNOME terminal)
3. Chat with some people ;-)
4. Find missing lines or double lines or strange hopping things after
   1-5 screens of text.
[5. Try the same using TERM=linux and see the difference]

Actual results:
Hopping lines etc.

Expected results:
Normal behaviour as it was a long time ago...