This commit will now allow us to track read position in a thread and returns to this position when you open the thread.
Note this commit is also extracting the following components to make it possible:
- `<ChatMessagesScroller />`
- `<ChatMessagesContainer />`
The `UpdateUserThreadLastRead` has been updated to allow this.
Various refactorings have also been done to the code and specs to improve the support of last read.
* FIX: increases resize observer throttle delay
25ms is not necessary and was sometimes causing jankyness.
* FIX: removes ios momentum fix delay
Instead of a 50ms, simply use next+schedule("afterRender") to attempt to have the shortest delay possible.
* FIX: backdrop event propagation
Prevents backdrop touch to propagate to underlying channel/thread.
* UX: adds is-active class to container of active message
This change allows to keep the background on the active message while the actions menu is displayed.
* FIX: prevents skip-link to be selected on press
* UX: allows to close actions menu instantly
The backdrop should always receive events, we don't need to wait for the menu to be fully displayed.
* UI: adds spacing between last message and composer
* UI: makes backdrop less dark
* FIX: makes events passive on long-press modifier
