Adam Barth eb839755b7 Overscrolls should appear below pinned headers (#8383)
With slivers, the app bar is part of the scroll view. Naively, the overscroll
appears at the beginning of the scroll view, but that's not the desired
behavior. Instead, the app bar should remained pinned to the top of the scroll
view and the overscroll should appear below the app bar, which is what this
patch does.

Fixes #8228
2017-02-24 08:11:08 -08:00
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