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[BUG] Article bar should scroll off when user scrolls downwards to read article
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Description

Reported on OTRS: https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=9956078

Steps to reproduce

  1. Open an article with sufficient content requiring scrolling
  2. Swipe upwards to scroll down the article page

Expected

The tool bar at the top scrolls off per Material scrolling behavior

Actual

The tool bar changes color from transparent to dark gray, then remains pinned to the top of the screen until much page has been substantially scrolled.
Open to view animation:

Occurring on

First reported in OTRS, replicated on...
Device = Pixel (Android 7.1.2)
Version = Wikipedia 2.5.195-alpha-2017-05-11