Scrolling to chitchat item is flaky and weird

[edwh]

NewsThread and child components have a scrollTo prop. This is to handle the case where you click on a notification for a chitchat activity, and want to scroll the relevant item into view.

I've seen a case on mobile where there is a reply to a reply which generates a notification, but clicking on the notification doesn't scroll down to the relevant reply (which is visible if I scroll down).

I've not tried to debug this. See if you can reproduce it first; if you can't then I'll see if I can set up a repro for you.