User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; de; rv:1.9.1.8) Gecko/20100204 SUSE/3.5.8-0.1.1 Firefox/3.5.8

During installation, on the "details" tab, it would be nice to be able to scroll back in the "performed activities" list and read older entries while the installation is still under way. Currently this is impossible because the arrival of each new message line forces the list's scroll position back to the bottom.

Proposal for improvement: if the scroll position is at the bottom when a new message arrives, keep it at the bottom so that the new line is visible (current behaviour), but (new) if the user has scrolled up, maintain the position the user has selected.

Reproducible: Always

Steps to Reproduce:
1. Start installation.
2. Switch to the "details" tab.
3. Wait for the "performed activities" text box to fill up and become scrollable.
4. Scroll back to read one of the messages scrolled out. 
Actual Results:  
A fraction of a second later, the scroll position is back at the bottom because another message line has arrived, and the message you wanted to read is scrolled out again.

Expected Results:  
(Well, not expected as such, but desired:)
The scroll position is maintained so that you can read the message at leisure.
Meanwhile the scroll bar shrinks, indicating that the total length of the text in the box is growing.