Bug 340438

On a desktop with CentOS 7;  Linux 3.10.0-123.el7.x86_64 x86_64; KDE 4.10.5; konsole 2.10.5
Some konsole windows do not scroll properly: when scrooling using the scrollbar or the scroll butoon on the mouse: the behavior is that some bottom lines and some top lines are updated and the lines in the middle of the window remain the same.
'some lines' means: sometimes 1, sometimes 5, sometimes 6.

I have not been able to reproduce it consistenly...
I have 8 konsoles: 4 for a shell on the local desktop and 4 for a shell on a remote linux system whcih is accessed by SSH.
The improper scrolling only occurs only on all 4 konsoles with the remote shell and only when used for 2 days.

Reproducible: Sometimes

Steps to Reproduce:
1. open konsole
2. use ssh to go to remote Linux system
3. use it 2 days
4. try to scroll the content of the konsole

Actual Results:  
window incorrectly displays content.  Only some top and some bottom lines ar correct and the middle lines are bogus.

Expected Results:  
all rows, especially the middle rows, have the correct content.

new computer. Intel i5, 16 GB RAM, RAID1 disks.