Description of problem:
When switching tabs in gaim-1.5.0-9, the display updates to the new tab, and
then the conversation scrolls down to the bottom. This is visually disruptive,
especially if there are many tabs open and they are being switched through
quickly. This happens in IRC, but I did not check other protocols. The previous
release did not exhibit this behavior.

Version-Release number of selected component (if applicable):
gaim-1.5.0-9

Steps to Reproduce:
1. Open a tab representing a new conversation
2. Switch away from the tab and allow the conversation to overflow the page
3. Switch back to the tab
  
Actual results:
The display refreshes, and then it scrolls down visibly

Expected results:
The scrolling should happen before the refreshing so that it isn't visible.