[Webkit-unassigned] [Bug 169129] Can't reliably scroll page whenever mouse cursor inside iframe inside scrollable div with touchpad

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169129

--- Comment #10 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
EventHandler::platformPrepareForWheelEvents() has some confusing code:

            scrollableContainer = findEnclosingScrollableContainer(wheelEventTarget.get(), wheelEvent.deltaX(), wheelEvent.deltaY());
            if (scrollableContainer && !is<HTMLIFrameElement>(wheelEventTarget))
                scrollableArea = scrollableAreaForContainerNode(*scrollableContainer);
            else {
                scrollableContainer = view->frame().document()->bodyOrFrameset();
                scrollableArea = makeWeakPtr(static_cast<ScrollableArea&>(*view));
...

Here scrollableContainer is the overflow:scroll in the main document. wheelEventTarget is the <iframe> element. So we call into:
                scrollableContainer = view->frame().document()->bodyOrFrameset();
and scrollableContainer ends up as the body(!) of the main page.

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