jump to unread messages divider is off-screen

from justdave: On RiotX, when you switch to a channel with lots of unread messages and click the blue jump to unread messages banner, it jumps so that the top of what you can see is the first message you haven't read yet... except, you can't tell if that's really it or not. If you scroll up just a hair, you can see the 'unread messages' divider line was just off-screen. It would give you better confirmation that you got where intended if that divider line was visible onscreen after the jump