In the final beta of 8.3 I ended up with a massive notification dialog due to the addition of FLC resources, etc. I had 6 separate notifications at one point.
- Downloading
- Preparing Library
- Indexing
- Updated to 8.3
- 65 updated resources
- 6 updated datasets
During this time, I couldn't scroll to the bottom of the list since it would continue jumping around and forcing me back up. Even when not scrolling, the text would move very slightly at approximately 1 second intervals (I have a screencast of this behavior). I didn't report it right away because an SR had already shipped and I was trying to update to that to see if anything had changed (never managed to get the SR to download).
The other issue I noticed is that the on-hover popup simply showed a blank line instead of the 6th line ("x updated datasets"). After dismissing 2 notifications, all 4 applicable lines showed in the popup.

NOW. Since 8.4 I haven't had occasion to get this many notifications, so I don't know whether anything has been resolved. However, there is now an extra space in the popup...

Edit: I also wanted to mention that I was sure that a link to the release notes used to appear next to the "updated to x" notification, but doesn't any longer.