[Webkit-unassigned] [Bug 196330] Overlays on instagram.com are shifted if you click on a photo after scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196330

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
The site basically does:

document.body.style.top = -window.scrollY + 'px';
document.body.style.position = "fixed";
// show fixed overlay

so we get a scrolling tree commit that has a new layout viewport (goes from origin 0,scrollTop to 0,0) and a new scrollPosition.

In this case, we have to clobber the scrolling thread's notion of scroll position because the document suddenly became non-scrollable, so this has to act like a requestedScrollPosition change.

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