This fixes a common React warning we see. Most of these components should be using constructors instead, however componentDidMount is just as good (and doesn't require converting most of these).
Conversion to classes will be done in a later stage of React warning fixes.
For https://github.com/vector-im/riot-web/issues/12877
By default, aria-live regions only speak partial updates. However in the case of the typing indicator, if it goes from one person typing to several, and back, the updated text would only be spoken in fragments by screen readers. Adding the aria-atomic attribute with a value of true makes screen readers always speak the full update for this tile, making the experience much nicer.
Signed-off-by: Marco Zehe <marcozehe@mailbox.org>
We use `export default` begrudgingly here. Ideally we'd use just `export`, though this entire SDK expects things to be exported as a default. Instead of breaking everything, we'll sacrifice our export pattern for a smaller diff - a later commit can always do the default export -> regular export conversion.
instead of setting a min-height on the whole timeline,
track how much height we need to add to prevent shrinking
and set paddingBottom on the container element of the timeline.
