Avatar rides shotgun in the profile bar
Scroll a profile and the big photo doesn't vanish. It shrinks into the sticky top bar, bringing the name and handle with it. Until then, the bar isn't there at all.
Open a profile and the top of the page belongs to the page. You get an 80-pixel avatar, a name, a bio, and no bar in sight. Scroll, and the avatar peels away from the header, shrinking to 40 pixels as it climbs into a 64-pixel bar. The developer's name and handle fade in behind it, and the bar picks up its background and bottom border in the last quarter of the trip.
Credit richardkeep, who rebuilt the bar around one moving avatar rather than a duplicate. The code watches the page's scroll position and the avatar's box, then computes how far it has travelled and slides the photo from 80 to 40 pixels, scaling the ring and live badge to match. The math even counts the 4-pixel offset and 2-pixel ring, a 6-pixel head start. Text and background stay invisible until the trip is 75 percent done, and the handoff finishes only when the original photo is fully behind the bar. Click Commits, Replies, or README and the page keeps its state, so the bar stays put instead of replaying the move.
There's one loss. The old bar told you how many commits the developer had. The new one trades that for the handle, so once you're deep in the feed the count is back up in the stats row you already scrolled past.