[Webkit-unassigned] [Bug 244232] overscroll-behavior: none doesn't prevent overscroll when page is too small to scroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244232

--- Comment #2 from Kurt Revis <krevis at figma.com> ---
I'm suspicious of this code in WebCore/page/FrameView.cpp:

OverscrollBehavior FrameView::verticalOverscrollBehavior()  const
{
    auto* document = frame().document();
    auto scrollingObject = document && document->documentElement() ? document->documentElement()->renderer() : nullptr;
    if (scrollingObject && renderView() && renderView()->canBeScrolledAndHasScrollableArea())
        return scrollingObject->style().overscrollBehaviorY();
    return OverscrollBehavior::Auto;
}

When renderView()->canBeScrolledAndHasScrollableArea() is false, we ignore the style and return Auto instead. What is that check trying to accomplish?

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