- Conversation list has been temporarily moved to use a whole windowed list to
  render everything in the list all at once instead of using the quantized
  virtual list that had become glitchy during the material to semantic
  de-bitrotting.
- Both the conversation and message lists now use position:sticky for the
  header which fixes all the constant problems, although this will need more
  work.  (In particular, the message list header visually moves on scrolling
  because of minor padding that gets mooted.