[Webkit-unassigned] [Bug 254855] [UI-side compositing] fast/scrolling/mac/momentum-scroll-with-borders.html is flakey

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=254855

--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
WheelEventTestMonitor logging reveals:

21:25:40.660 73440   TileController::tileSize newSize=width=800 height=600
21:25:40.660 73440     WheelEventTestMonitor::clearAllTestDeferrals: cleared all test state.
21:25:40.660 73440     WheelEventTestMonitor::checkShouldFireCallbacks - have not yet seen any deferral reasons
21:25:40.660 73440     WheelEventTestMonitor::checkShouldFireCallbacks - have not yet seen any deferral reasons
21:25:40.660 73440     WheelEventTestMonitor::checkShouldFireCallbacks - have not yet seen any deferral reasons
21:25:40.660 73440   EventHandler::handleWheelEvent PlatformWheelEvent 0x7ff7b4cd74a0 at (100,120) deltaX 0.00 deltaY -10.00 phase "began" momentum phase "none" velocity width=0 height=0 processing steps [synchronous scrolling, blocking DOM event dispatch]
21:25:40.660 73440         (=) WheelEventTestMonitor::receivedWheelEventWithPhases: phase=began momentumPhase=none
21:25:40.660 73440         (=) WheelEventTestMonitor::deferForReason: id=0x75b0c0ae0, reason=handling wheel event on main thread
21:25:40.661 73440   LocalFrameView::setWasScrolledByUser at 1
21:25:40.661 73440   EventHandler::handleWheelEventInScrollableArea() RenderLayer 0x792002c60 300x500 - eventHandling [dispatched to DOM] -> gesture state non-blocking
21:25:40.661 73440   RenderLayer 0x792002c60 300x500 requestScrollPositionUpdate (0,10)
21:25:40.661 73440   RenderLayerScrollableArea [0] scrollTo (0,10) from (0,0) (is user scroll 1)
21:25:40.661 73440   ScrollableArea (RenderLayer 0x792002c60 300x500) handleWheelEvent - handled 1
21:25:40.661 73440   Element node 0x792004990 DIV 0x792004990 class='content' dispatchWheelEvent: (cancelable 1) defaultPrevented 0 defaultHandled 1
21:25:40.661 73440         (=) WheelEventTestMonitor::removeDeferralForReason: id=0x75b0c0ae0, reason=handling wheel event on main thread
21:25:40.661 73440   WebPage::wheelEvent - processing steps [synchronous scrolling, blocking DOM event dispatch] handled 1
21:25:40.661 73440     WheelEventTestMonitor::setTestCallbackAndStartMonitoring - expect end/cancel 0, expect momentum end 0
21:25:40.661 73440     WheelEventTestMonitor::checkShouldFireCallbacks: scrolling is idle, FIRING TEST

so we're ending too early, when we've only seen the first event.

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