## Ticket
6886 Livestream auto-scroll problems
## Issue
- `performedInitialScroll` was problematic as it won't allow auto-scroll even when user scrolled back to the bottom.
- The dependence on `commentElement` seems to assume a certain comment height? Not sure.
## Approach
- Add a scroll listener and stash the last scroll position.
- When a message is received, check if it's at the bottom. If yes, maintain that position after the new comment is added. If not, leave as is.
- When submitting a comment, always reset to the bottom.
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