Version:           2.1b4 (using KDE 4.5.1) 
OS:                Linux

If I scroll down so that the cursor is located above the last VISIBLE line of the page, when I start typing the screen jumps up. Where the screen jumps to depends on where it was previously (i.e. it doesn't jump to a fixed place).

It did not do this previously on my system before I installed some updates from the Kubuntu 10.04 backports repository.

Reproducible: Always

Steps to Reproduce:
1. Open or create a new document that has more than a page of text.
2. Scroll down so the cursor is located above the last VISIBILE line (not necessarily the last absolute line of the document).
3. Type something.

Actual Results:  
The screen jumps up.

Expected Results:  
The screen doesn't jump.