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Wheel events don't latch to inner scrollable elements
https://bugs.webkit.org/show_bug.cgi?id=128225 Reviewed by Beth Dakin. * page/EventHandler.cpp: (WebCore::EventHandler::handleWheelEvent): Identify the case where we have hit the end of a scroll, and treat that as a valid 'handled' case. If the scroll event is just starting, treat end-of-scroll as unhandled so the parent element can handle things. * page/WheelEventDeltaTracker.h: (WebCore::WheelEventDeltaTracker::isFirstWheelEvent): Added. Canonical link: https://commits.webkit.org/146340@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@163558 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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