"Show new" should scroll the page to make new post appear above old posts.
When you try to backlog a timeline and you click on the "Show new" button, the timeline shouldn't go up. New statuses should appear upside while the timeline stays at the toot you were reading.
For now when you click on "show new" you'll be scrolled up to the top and have to scroll down and find where you was and then go up which is a bit cumbersome.
That way it would be easier not to miss anything.
Edited by HJ